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Dacks, R., T. Ticktin, S. D. Jupiter, and A. Friedlander. 2018. Drivers of fishing at the household scale in Fiji. Ecology and Society 23(1):37.
https://doi.org/10.5751/ES-09989-230137
Research

Drivers of fishing at the household scale in Fiji

1Department of Biology, University of Hawaiʻi at Mānoa, Honolulu, Hawai'i, USA, 2Department of Botany, University of Hawaiʻi at Mānoa, Honolulu, Hawai'i, USA, 3Wildlife Conservation Society, Melanesia Program, Suva, Fiji, 4Pristine Seas, National Geographic Society, Washington, D.C., USA, 5Fisheries Ecology Research Lab, Department of Biology, University of Hawai'i at Mānoa, Honolulu, Hawai'i, USA

ABSTRACT

Coral reefs sustain millions of people worldwide, yet in recent years, social, environmental, and climate change have caused major declines in coral reef fisheries. Small-scale coral reef fisheries research has largely focused on community-level drivers of fishing, ignoring the heterogeneities that exist within communities. We used social-ecological indicators from 20 coastal villages in Fiji to identify potential fine-scale, context-appropriate drivers of estimated household fish catch. Indicators were developed based on a review of the literature, discussions with local experts, and a pilot study. Using structural equation models, we found that importance of fishing to income, household fish consumption, livelihood diversity, travel time to market, and coral reef area all positively affect estimated household-level fish catch. Our results contrast with findings from other larger scale studies by identifying that households further from markets had higher fishing frequency. We highlight the role of middlemen in these small-scale fisheries, who have been largely overlooked as drivers of fisheries catch. Our findings emphasize the need for household-level analyses to better understand the complexities in coral reef social-ecological systems to more effectively manage small-scale fisheries in communities.
Key words: coral reef fisheries; livelihoods; local ecological knowledge (LEK); market access; social-ecological systems; social network analysis; subsistence fisheries

INTRODUCTION

Fish play a significant role in the resilience of Pacific coral reef social-ecological systems. On the human side, fish provide a major source of protein (Bell et al. 2009, Teh et al. 2013, Charlton et al. 2016), are shared in complex social networks (Severance et al. 2013, Vaughan and Vitousek 2013, Kittinger et al. 2015), are central to cultural identity (D’Arcy 2006, Friedlander et al. 2013, Veitayaki et al. 2014), and provide an important source of income (Moberg and Folke 1999, Teh et al. 2009). On the ecological side, herbivorous fishes help keep algal levels in check (Hughes et al. 2007), maintaining open space for recruitment of reef-building taxa, which in turn enhances the resilience of coral reef ecosystems (Cheal et al. 2010). The preservation of higher trophic levels (e.g., sharks, groupers, jacks) helps maintain ecosystem balance (Heithaus et al. 2008). Coral reefs with lower densities of top predators have been found to have higher numbers of coral-eating crown-of-thorns starfish (Acanthaster planci; Dulvy et al. 2004) and lower coral and coralline algae cover (Sandin et al. 2008).

Social, environmental, and climate change have caused worldwide declines in coral reef ecosystems (Gardner et al. 2003, Bruno and Selig 2007, Burke et al. 2011) and their associated fisheries (Newton et al. 2007, Mora et al. 2011). Recent studies have made important contributions to our understanding of human dimensions of coral reef social-ecological systems. Human population density has been documented as a positive driver of fishing pressure (Williams et al. 2008, Brewer et al. 2012) and negative driver of reef fish biomass (Mora 2008, Sandin et al. 2008, Cinner et al. 2009). Other social factors that affect fishing pressure and/or reef fish biomass include socioeconomic development, e.g., the presence of certain infrastructure and facilities (Cinner et al. 2009, Brewer et al. 2012) and fisheries management regime, i.e., traditional management, comanagement, national parks (McClanahan et al. 2006). Recent research has found an increase in fishing pressure (Brewer et al. 2012) and lower fish biomass (Cinner and McClanahan 2006, Cinner et al. 2013, Maire et al. 2016, McClanahan et al. 2016) closer to markets. Though our understanding of how social systems are linked to coral reef ecosystems has greatly improved, our understanding of what drives household-level fish catch is still lacking because the social measures that have been examined as drivers of fishing pressure are at the geographic community level or higher, e.g., human population density or presence of large-scale infrastructure such as schools and roads. Human communities, whether defined spatially or by social structure, are not homogeneous (Agrawal and Gibson 1999), and the variation of interests and behaviors of individuals or households within communities influence the state of resources (Kramer et al. 2009). Because behaviors can be managed, it is especially important to understand what influences individual and household-level fishing activities (Aswani et al. 2015).

In the Pacific, where human well-being is especially dependent on natural assets and kinship ties (Pascua et al. 2017, Sterling et al. 2017), factors that influence household fishing levels may include dependence on fish as a food source, importance of fishing to income, livelihood diversity, local ecological knowledge, and connectedness. Fish consumption in the region is high, though with recent urbanization, there has been a shift to an increasingly modern diet of imported goods and less local foods, including fresh fish (Charlton et al. 2016). One reason for this shift has been the increase in salaried incomes in urban areas, which is associated with a reduced dependence on fishing (Charlton et al. 2016). However, although there may be reduced dependence on fishing at the household level, other studies have found greater total fishing pressure closer to towns (Brewer et al. 2012). Proximity to markets or towns, commonly used as an indicator of market access (Brewer et al. 2012, Maire et al. 2016), has included measurements beyond simply distance, such as population size (Brewer et al. 2009), but is not a complete measure of access to market because it has not taken into account transportation availability and does not consider all forms of monetary transactions. Middlemen, for example, are important intermediaries who provide links to markets, reducing the time and effort of fishers to market their catch. Although the role of middlemen has been documented in small-scale fisheries (Crona et al. 2010, Brewer 2011, Mangubhai et al. 2016), middlemen have been largely overlooked as drivers of fisheries catch. Because fish are not always sold in towns, a measurement of fishing income may be a better indicator of the influence of market integration on household fishing.

Artisanal fishers, like many rural residents in developing countries, have a high number of livelihood strategies (Allison and Ellis 2001, Cinner et al. 2010). The relationship between livelihood diversity and household-level catch is less certain. Although scenario-based studies show that increased livelihood diversity may increase a fisher’s willingness to exit a fishery, there is a lack of evidence to show that fishers with more livelihoods have lower fishing effort (Brugère et al. 2008, Cinner 2014). In addition, in the Pacific, given the high levels of subsistence activities, it is important to consider all sources of livelihood rather than just those generating income (Campbell 2015). For example, households may partake in mat weaving not for selling, but for customary exchange or to contribute to cultural functions.

Local ecological knowledge (LEK) refers to knowledge systems encompassing world views, cultural practice, and beliefs that have developed over centuries and are constantly evolving (Berkes 1999). Examples from across the Pacific indicate that for centuries, LEK has influenced individual and community scale marine resource use (Johannes 1978, Veitayaki 2002). It is important to note that knowledge embedded within LEK systems has been used both to maximize efficiency of harvests (Foale 1998) and to restrict harvesting (Johannes 1978, Friedlander et al. 2013). Foale et al. (2011) highlight that applying knowledge for the purpose of conservation was never needed in places that were sparsely populated and did not experience resource depletions. Regardless of how LEK has been applied, there is increasing acknowledgement that LEK is invaluable for developing effective place-based natural resource management (Berkes et al. 2000, Poepoe et al. 2007, Thornton and Maciejewski Scheer 2012).

Resource sharing, including through reciprocal exchange, is one of the four important features of social capital identified by Pretty (2003). Resource sharing occupies a very important part of Pacific Island culture and facilitates maintenance of traditional linkages (Veitayaki 2002, Nabobo-Baba 2011, McMillen et al. 2014). In the context of these linkages, several studies have shown the extent and socio-cultural significance of fish sharing networks across the Pacific (Severance et al. 2013, Vaughan and Vitousek 2013, Kittinger et al. 2015). The spatial extent of exchange can be great and may stretch across island groups as in Micronesia, where coolers of reef fish are sent from outer islands to family members on the main islands (Oles 2007). In American Samoa and the Commonwealth of the Northern Marianas Islands, customary exchange was identified as a major driver of fishing effort (Severance et al. 2013).

We aim to better understand the drivers of household fish catch by asking (1) what direct and indirect social indicators drive household fish catch?; and (2) what is the role of proximity to town in influencing household fishing levels in areas in which middlemen are widespread? We address these questions using household-level, context specific, empirical data. We focus on Fiji where coastal communities are located in close proximity to reefs, communities have rights to manage these reefs (Matthews et al. 1998, Clarke and Jupiter 2010), and reef fisheries are highly important to local livelihoods (Teh et al. 2009). Despite their importance, many of Fiji’s inshore reef fisheries are now threatened from overfishing, destructive and illegal fishing, and pollution, leading to socioeconomic hardship including loss of income and diet changes (Turner et al. 2007, Teh et al. 2009). In addition, road development, a government priority in the last decade, has greatly increased market access in many areas (Asian Development Bank 2015). As a result, stakeholders and managers are currently interested in better understanding drivers of fish catch in order to better manage marine resources throughout Fiji. We predicted that market access, LEK, livelihood diversity, seafood consumption, importance of fishing to income, reef area, and connectedness will be directly and indirectly correlated with estimated fish catch (Table 1, Fig. 1).

METHODS

Study site

Fiji is an archipelago consisting of over 300 islands, many of which are surrounded by fringing and barrier coral reefs. The population is just under 900,000 and about half of the country lives in rural areas (FBoS 2007). Most of the indigenous rural population lives in villages that comprise one or more tribes (yavusa; Ravuvu 1983). Rural villages rely heavily on their terrestrial and marine natural resources for subsistence and sale (Rawlinson et al. 1995, WCS 2012).

Although the national government recognizes the subsistence fishing rights, fishing grounds are legally owned by the national government with open access granted for subsistence with certain gear types, and fishing licenses are required for trade or sale (Matthews et al. 1998). However, customary fishing grounds (qoliqoli), extending to the outer reef, are informally divided into smaller units (kanakana) that are fished by single or multiple villages, with access granted by the chief of that village. Though not legally recognized, customary management over the qoliqoli and kanakana is still practiced in most rural areas in Fiji (Clarke and Jupiter 2010, Sloan and Chand 2016).

Urbanization, globalization, and integration into cash economies have all impacted traditional social structures and customary resource use. Access to markets has increased purchasing power, changing reliance on natural resources for food and income (Ravuvu 1988, Turner et al. 2007). School and church fees, medical and transportation costs, and purchase of imported goods has increased the need for income generating activities (Matthews et al. 1998). There is now less respect for the traditional roles of hereditary chiefs in mandating and enforcing natural resource management with recent national legislation and access to markets (Minter 2008, Jupiter et al. 2010, Sloan and Chand 2015).

Household surveys

To identify potential social drivers of fisheries catch, we conducted research in 20 indigenous Fijian coastal villages across five districts in Fiji from August to November 2014 (Fig. 2, Appendix 1). Districts were selected to represent a range of socio-cultural, economic, and ecological conditions.

In villages with fewer than 20 households, we invited all households to be surveyed. In larger villages, we surveyed a random sample of 20 households (Appendix 1 contains a list of villages with number of households and percentage surveyed). We conducted a total of 330 household surveys (Fig. 2). All survey activities were approved by the University of Hawaiʻi Institutional Review Board, Fiji Ministry of Education, local Provincial Offices, and highest ranking village elders within each community. Surveys were conducted with heads of households, which were defined as those who made household decisions. A household was defined as a group of people who regularly shared meals. Household interviews were structured surveys lasting approximately 45 minutes. Questions covered topics including socioeconomics, fishing and farming activities, ecological knowledge, resource sharing, and material assets (Table 2). Focus group discussions, participatory mapping exercises, and interviews with the village headmen were also conducted to better understand and triangulate village-level characteristics of resource management and market connections. All interviews were conducted in the Fijian language.

Social network surveys

A social network analysis of resource sharing between households in each village was conducted to measure connectedness, an important component of social capital. To conduct the social network analysis, households in each village were asked to provide the names of the other households in which they received or gave resources (e.g., fish, crops, prepared food) within the previous two weeks (Appendix 2). In order to assess the whole network, we sampled ≥ 80% of households. In villages where we surveyed ≥ 80% of households with household surveys, these questions were simply incorporated into the household survey. In villages where we conducted household surveys with ≤ 80% of households, additional households were given only the social network survey, so that the total number of households that were given the social network questions was ≥ 80%.

Social network calculations were done using Visone software (Brandes and Wagner 2004). Degree centrality (the sum of the number of households the respondent’s household shared with or received resources from) was used to indicate the household’s connectedness. For the purposes of this analysis, we calculated degree from an undirected graph because we did not need to distinguish between giving and receiving of resources.

Social indicators

We measured a suite of social indicators in our household surveys based on a review of the literature and discussions with local experts from universities and nongovernmental organizations (Table 2). Survey questions that measured indicators of LEK were developed from a pilot study that was conducted in 2013 (Appendix 2). We calculated proximity to market as the distance along a road and/or boat path to town, as well as travel time to town and market trip frequency to take into account factors that are not represented in a simple distance measure, such as speed, frequency, and price of travel mode. Livelihood diversity was measured by the number of income sources the households had, as well as by the total number of livelihoods, which included nonmonetary sources used for food and cultural offerings. Importance of fishing to income was based on the respondent’s ranking of their income sources.

To measure local ecological knowledge (LEK), we developed an LEK index that included standardized metrics of knowledge transmission (20%), knowledge of fish identification (40%), and knowledge of fish ecology (40%; Appendix 2). We measured knowledge transmission by asking whether or not the respondent formally or informally teaches fish names to the younger generation(s). We measured knowledge of fish identification by asking for 20 local fish names (fishes were a combination of common and rare species; higher scores were given to specific names, lower scores were given to general or family names). We measured knowledge of fish ecology by asking about fish diets and the timing of spawning for groupers (family Epinephelidae), emperors (family Lethrinidae), and parrotfishes (family Labridae). Together these fish families were chosen based on their diverse functions, but also because they are important for subsistence, sale, and cultural events. Because there is documented information of some fish diets (http://www.fishbase.org), points were given to responses that match existing data for fish families. Because timing of spawning may vary spatially and temporally (Schemmel and Friedlander 2017), points were given to any response and no points were given to those who responded that they did not know. These scores provide an index of LEK but not a comprehensive measure (Zent and Maffi 2009). Because small differences in the index are not meaningful, we then ranked the scores from low to high based on three broader groupings.

To assess material wealth, the number of assets from a list of appliances were tallied using methods modified from McClanahan et al. (2008). Total reef area was calculated by overlaying the GIS layers of coral reef locations made available by the Millennium Coral Reef Mapping Project (Andréfouët et al. 2006) in ArcMap 10.4.1 (Esri 2016) onto a layer identifying reefs that are commonly fished. The second layer was created by asking respondents (in household interviews and focus groups) to identify on a map the reefs that they frequently access to harvest fish. We did not include all reefs within fishing grounds in the calculation of reef area because in some districts, distant reefs are not accessed. Though we intended to calculate the reef area from the kanakana, we calculated reef area at the district level because there was significant overlap in the use of fishing grounds between villages in the same district; households fished in areas outside of their kanakana, so kanakana area does not accurately reflect the size of the reefs being accessed.

Estimated annual household catch

We estimated total annual household catch from trip frequency estimates and catch per unit effort (CPUE) for each gear type. Two fishers each from 13 villages across Fiji completed training on recording catches in logbooks. Of these 13 villages, eight are located in four of the five districts in which household surveys took place. Fishers recorded all fishing landings in their village, in a haphazardly chosen 24-hour period once to twice a month over a six-month period and recorded information for each fishing trip, including gear type used. The biomass of individual fishes was estimated using the allometric length-weight conversion:

Equation 1(1)

where parameters a and b are species-specific constants, FL is fork length in cm, and W is weight in grams. Length-weight fitting parameters were obtained from Kulbicki et al. (2005). Total biomass was calculated by taking the sum of the biomass of all individual fish caught per trip. Catch per unit effort for each gear type was determined as:

Equation 2(2)

in which fishing time was in hours. To calculate fishing time, we subtracted the travel time from the total time of the fishing trip because we were interested in using CPUE to estimate catch, rather than using it to compare CPUE between sites or how CPUE changed over time, for which it would be important to include travel time. Trips in which multiple types of gear were used, or in which invertebrates were harvested, were not included for the purposes of calculating gear-specific CPUE. CPUE estimates were calculated for each trip and then averaged for each gear type across all sites. For gillnet fishing, a catch per set, rather than a catch per time period was calculated. CPUE estimates were within the range of other estimates in Fiji (Appendix 3).

Using the CPUE estimates, annual household catch for each gear type was estimated as:

Equation 3(3)

Information on the frequency of household fishing trips was recalled for each gear type in the household interviews. Estimated household catches for handline fishing, day spearfishing, and night spearfishing were calculated separately for each gear type by multiplying the household’s estimated number of annual fishing trips by the catch per unit effort and the mean trip time (the latter two metrics were calculated using the catch logs described above). For estimating household catch from gillnet trips, number of annual household gillnetting trips was multiplied by mean catch per set. Total estimated annual household catch was calculated by summing the estimated annual household catch of each gear type used.

We recognize that our indirect estimates of household catch are inflated compared with other catch landing data, disaggregated by gear, for Fiji (e.g., Bell et al. 2009). Recall bias has been shown to cause overestimation of fishing frequency, especially when multipliers are used, e.g., extrapolating weekly frequency to calculate an annual frequency (Vaske et al. 2003), as fishers are not likely to fish every week given poor weather, sickness, or events, e.g., weddings, that require travel out of the village. However, it is reasonable to assume that this recall bias is consistent across respondents, gear, and sites and, because our model seeks to assess the variation within household catch, and not predict the actual household catch; therefore, the likely inflation of estimates should not affect the model.

Statistical analyses

All potential drivers of fisheries catch were regressed against estimated annual household catch using general linear mixed models, with village as a random effect. We used structural equation modeling (Grace 2006) using the lavaan program (Rosseel 2012) in R (R Development Core Team 2015) to model drivers of fishing. We chose structural equation modeling over multiple regression because we wanted to take a systems approach, differentiate between direct and indirect drivers of fishing pressure, and because we expected that some of our potential drivers would be correlated (Cullen et al. 2007, Cinner et al. 2007; Appendix 4). We first specified a hypothesized model based on published literature and our existing knowledge of the system (Fig. 1). Because the households were not a simple random sample of villages in Fiji, we used a model in which households were nested within villages. We used modification indices to identify missing paths, which may help to improve the model (Grace 2006), yet did not find any that were grounded in theory or existing knowledge, so no modifications were made. Nonsignificant drivers (determined by examining p-values) were then sequentially eliminated and the best-fit model was determined from comparing all models using Akaike’s Information Criterion (AIC; Grace 2006; Appendix 5).

RESULTS

Over 96% of households interviewed participated in some fishing activity and 33% of households reported fishing as one of their top three income sources (Table 3). Our household surveys revealed a large amount of variation in household-level measures (Fig. 3, Appendix 1). Travel time to town, livelihood diversity, LEK, connectedness, importance of fishing to income, and fresh seafood consumption were all positively correlated (p<0.05) with estimated mean annual household catch (Fig. 4).

Fresh seafood consumption averaged 3.2 days week-1 and ranged from 0 to 7. The number of livelihoods averaged 7.8 and ranged from 2 to 14 (Fig. 3). Fishing, farming of taro (Colocasia esculenta), kava (Piper methysticum), and coconut (Cocos nucifera), along with formal employment were the most common livelihood sources. However, different livelihood sources provided the top source of income in different villages. For example, in villages close to urban areas and large resorts, about half of households listed formal employment as their top income source. In contrast, over half of households in the remaining villages responded that farming is their top livelihood source. Less common sources of livelihood included handicrafts, small businesses, and remittances.

Despite the variation in LEK, certain kinds of LEK were common across households. Most respondents had some knowledge of local species names, some knew about target fish diets, but few knew of fish spawning times. Of those that knew of spawning times, most only knew of grouper spawning periods, possibly the result of a recent national campaign to avoid eating groupers during their spawning season.

In the best fit structural equation model (χ2 = 0.61, Fig. 5), importance of fishing to income, livelihood diversity, fresh seafood consumption, total reef area, and travel time to market all had direct significant positive effects on estimated mean annual household fish catch (Appendix 5). Travel time to market was a direct driver of livelihood diversity and was thus also an indirect driver of estimated household fish catch. Overall the model explained approximately one third of the variation in estimated household fish catch (R² = 0.31). Fish catch sold had the strongest effect (standardized path coefficient = 0.27) on estimated household fish catch.

DISCUSSION

By using fine-scale, context appropriate social-ecological indicators and assessing their potential role in driving household-level fishing, we found trends that have not emerged in larger scale analyses on this topic. For example, in contrast to other studies that have found fishing pressure to increase with increasing proximity to markets (Brewer et al. 2012), we found that households further from town have higher fishing frequencies.

Distance to market and middlemen

Market integration, defined by distance to town and/or markets, has been found to be a negative driver of reef fish biomass (Cinner and McClanahan 2006, Cinner et al. 2013, Maire et al. 2016, McClanahan et al. 2016) and positive driver of fishing pressure (Brewer et al. 2012). Instead of relying on a single measure, we collected several indicators of market integration (distance to market, distance to fish sale location, travel time to market, frequency of market visits, importance of fishing to income, and population of nearest town). Of these, the best predictor was importance of fishing to income, a measure not based on proximity to market. Adding the population of the nearest town did not improve the model. Travel time to market was a significant positive driver of estimated household fish catch, meaning that households in villages further from towns had the highest fishing frequencies. The widespread presence of middlemen in Fiji may be one explanation for this finding. Middlemen buy goods, e.g., seafood and crops, directly from producers, e.g., fishers and farmers, and in turn sell to retailers or consumers. The role of middlemen in rural coral reef fisheries have also been reported elsewhere (Crona et al. 2010, Brewer 2011). In Fiji, middlemen are based in or regularly visit rural areas, essentially bringing markets to rural villages (Mangubhai et al. 2016). The presence of middlemen in rural areas may help to explain why we found that households further from markets had higher estimated annual catches (Fig. 1). In Kubulau District, the district furthest from towns in this study, 75% of fishers sell fish directly to middlemen.

We were unable to accurately include a measure of distance to middleman in the model because households are not linked to a single middleman or place of fish sale. Some households may only sell fish to middlemen at times when cash is unexpectedly needed, e.g., funerals, or when larger sums of money are needed, e.g., church contributions or school-related expenses. Other households regularly sell at both the market and to middlemen. They decide between the two based on their yield or species of fish caught. Our data suggests that household decisions about whether and where to sell fish is dynamic. Assuming that sites further from markets are less at risk of overharvesting can lead to ineffective policies and insufficient funding for management of remote sites, particularly where middlemen may act as moving markets. Further information on the presence and role of middlemen in Pacific Island communities could facilitate effective management adapted to the realities and diversity of local circumstances. Value chain analysis, which maps the flow of goods and their values as they pass between actors, do consider the role of middlemen, and are increasingly useful in the management of small-scale fisheries (Thyresson et al. 2013, Wamukota et al. 2014).

Drivers of estimated household fish catch

Resource managers must have a comprehensive understanding of how social and ecological systems are connected at a local level to avoid bolstering social resilience at the expense of ecological resilience, or vice versa. Our research suggests that introducing additional income generating sources may be successful in increasing livelihood diversity of households, but may not reduce fishing levels, and therefore will not likely increase ecological resilience. Like many rural residents in developing countries, fishers commonly have diversified livelihoods to compensate for the seasonality and high variability inherent in small-scale fisheries (Allison and Ellis 2001, Cinner et al. 2010). Past studies suggest that households with high livelihood diversity may have increased resilience to disturbances, e.g., natural disasters or economic shocks, because they are able to spread risk across each of their livelihood sources (Allison and Ellis 2001). However, we found livelihood diversity was a significant positive driver of estimated annual household catch, indicating that households with more livelihood sources may also be catching more fish. This finding contradicts the assumptions of projects that introduce alternative livelihoods as a means to relieve fishing pressure, which are often popular with conservation agencies (Wright et al. 2016). Reviews of alternative livelihood projects, however, have shown that introducing additional income sources does not necessarily reduce resource extraction (Jupiter et al. 2014, Roe et al. 2015) because sometimes households do not find the introduced livelihood as a suitable substitute (Wright et al. 2016). In the Pacific, where fish and fishing are central to culture and identity, alternative livelihoods may not provide resources needed for traditional events, allow individuals to carry out their traditional roles, or provide opportunities for knowledge transmission. Instead, alternative livelihood sources may just serve as supplemental income (see also Sievanen et al. 2005).

It is important to note that our measure of livelihood diversity is simply the number of livelihood sources, and does not take into account how much income each livelihood provides nor the quantity of nonmonetary goods a livelihood source may generate. However, we found the importance of fishing for income to be a stronger driver of household fishing than household consumption of fish. This suggests that efforts to reduce fishing for consumption may have less impact at reducing total catch than efforts to reduce fishing for income.

Although LEK was not a significant predictor in the structural equation model, it is significantly, positively correlated with estimated household fish catch (Fig. 4). This means that households with more LEK catch more fish. In our interviews, 37% of respondents said that they are not passing down the knowledge of local fish names, a form of LEK. Many of these respondents noted that they are not doing so because there is not an opportunity to do so (e.g., they do not go fishing with their children, children prefer watching television) or because they think their children learn the things they need to know at school. LEK has influenced natural resource use for centuries (Johannes 1978, 1981, Berkes 1999) and has potential to guide formal and informal contemporary place-based management (Berkes et al. 2000, Thornton and Maciejewski Scheer 2012). However, market influences may motivate fishers to use their LEK to increase harvests, e.g., target spawning aggregations of grouper or harvest gravid mud crabs, rather than to protect resources.

Although LEK and connectedness were not the strongest predictors of household fishing in our study, both influence fishing (Fig. 4) and should be further examined in future studies. Other, less structured types of surveys could be used to assess a broader suite of LEK that may influence fishing activities. For example, future surveys could examine the role of LEK in fishing practices by asking questions about how fishers determine fishing locations or the time at which they target certain species, along with asking about their fishing practices at these locations or times. In addition, although trust, exchange, norms, and connectedness make up social capital, we only measured exchange as a component of social capital. A more detailed examination of social networks that assesses metrics besides degree (number of connections per house) or incorporates other types of exchange, e.g., information, could better document the role of social capital in driving household fishing.

Future studies should also consider reef productivity along with reef area. The standing biomass can be influenced by natural environmental factors or anthropogenic factors and will impact CPUE, thus influencing fish catch. Finally, although we have investigated the drivers of estimated household catch, we acknowledge that it is not only the absolute biomass of fish extracted that will impact the ecology of reefs, but also the composition of the catch, which may be related to gear types used. A basic exploratory analysis of household social factors associated with different gear types can be found in Appendix 6. Trophic level, size, and reproductive status of individual fish in catches are important to consider when assessing sustainability of fishing practices (Jennings and Kaiser 1998, Friedlander and DeMartini 2002, Graham et al. 2005, Mumby et al. 2006). Further studies should examine if and how social indicators are related to additional catch characteristics.

Importance of considering household-level characteristics

In contrast to studies that have used socioeconomic surrogates of fishing pressure (Mora 2008, Williams et al. 2008, Brewer et al. 2012), we used reported fishing activity to estimate household fishing levels. However, we also measured commonly used fishing pressure proxies (population density, mean number of boats per household, and mean number of refrigerators per household). Consistent with Weeks et al. (2010), we found that although the more easily measured metrics may be effective at generalizing total fishing pressure at a high spatial scale, they do a poor job of characterizing more heterogeneous fishing patterns found in communities. For example, we found that the villages that had the highest levels of household fishing were those with few boats and almost no refrigerators (Fig. 6). If managers are aiming to develop regulations that focus on local-level fishing, a broad understanding of mean fishing levels in an area may not be helpful, given the large variation in household fishing catch (Fig. 3, Appendix 1) and commonly used proxies may even misguide managers on the levels of fishing occurring in an area.

An example of this occurred in Fiji after Cyclone Winston, which hit February 2016. In a postcyclone survey conducted to estimate impacts of fisheries dependent communities, village leaders were asked to rank their villages’ top livelihood source before the cyclone (Chaston Radway et al. 2016). We asked the same question, in some of the same villages, at a household-level and found that village-level results inflate the importance of fisheries in villages. If these village-level results are used to guide resource allocation for fishing gear replacement, villages might end up with more fishing gear than they had before the cyclone, and as a result, fishing levels could increase at a time when reefs are particularly vulnerable.

We understand that resources are not always available for household surveys, especially in times of crisis, such as after a major disaster. However, when possible, household-level surveys should be a priority. Our household surveys revealed a large amount of variation in household-level measures (Fig. 3), which is not surprising given the heterogeneities that exist within a community. Instead of trying to aggregate at a community level, a more accurate, yet challenging way to understand the diverse interests and behaviors of different actors is to focus on understanding “patterns of difference” within a community (Agrawal and Gibson 1999). Factors that may affect how decisions are made about fishing and the fate of fisheries resources that could not be represented in this type of quantitative analysis, and require a more nuanced study, include household responsibilities based on religion, traditional roles, and relationships with other households and communities (Veitayaki et al. 2014).

CONCLUSION

For effectively managing small-scale coral reef fisheries, it is necessary to move beyond a community-level understanding of drivers of fishing and consider the drivers of individual or household behaviors (Aswani et al. 2015). Simple measures of social factors that are being applied worldwide have greatly improved our understanding of how human dimensions are related to resource use, but not all of these measurements are appropriate at smaller spatial scales, which is the scale at which most management decisions are made. Finer-scale data better captures the variation of fishing within a community and the nuances that affect how decisions are made about fishing and the use of fisheries resources, and as such will allow for a better idea of the implications of different management measures.

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ACKNOWLEDGMENTS

This work would not have been possible without all the village members that generously volunteered their time for our surveys and graciously hosted us during our field work. We thank those who helped with household surveys and field work logistics: Rosi Batibasaga, Una Vuli, Mesulame Tora, Shimona Quazi, Seini Tawakelevu, Laisiasa Cavakiqali. Thanks to Rick Stepp for advising on the social network analysis. We also thank the Wildlife Conservation Society Fiji for their logistical support, the University of Hawaii NSF Coastal SEES working group for their feedback, and editors and reviewers for their thorough comments. Funding was provided by NSF GRFP Award #1329626, NSF Coastal SEES Award #SES-1325874, NSF CNIC Award #OISE-1160830, and the University of Hawaii Graduate Student Organization. Use of human studies in this research was approved through IRB exemption #CHS-20991.

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Address of Correspondent:
Rachel Dacks
University of Hawaiʻi At Mānoa
Edmondson Hall 216, 2538 Mccarthy Mall
Honolulu, HI
USA 96822
rdacks@hawaii.edu
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Table1  | Table2  | Table3  | Figure1  | Figure2  | Figure3  | Figure4  | Figure5  | Figure6  | Appendix1  | Appendix2  | Appendix3  | Appendix4  | Appendix5  | Appendix6