Table 9. Comparison among alternative clam exploitation scenario, as set by Figure 4. The extreme scenarios, represented by full exploitation scenario (data and estimates from 1999) and no exploitation scenario (†data, ‡estimates), are compared with three intermediate scenarios: ScenMix1, ScenNat, ScenMix2, assuming a revenue of 50,000 euro/year/worker. Surface and employments parameters have been set at first, productivity, revenue and externalities have been computed using modeling results.
| |
| |
|
parameters/scenarios |
1999 |
ScenMix1 |
ScenNat |
ScenMix2 |
Conservation |
| |
|
boats |
1400 |
400 |
400 |
|
0 |
|
workers |
2500† |
935‡ |
1288‡ |
1111‡ |
0 |
|
seeding tons (Natural)[tons] |
0 |
800 |
2400 |
1600 |
0 |
|
Seeding tons (Hatchery) [tons] |
0 |
1600 |
|
800 |
0 |
|
global surface fished/year [ha] |
40,500 |
2160 |
2880 |
2520 |
0 |
|
sediment loss (from Orel et al. 2000)
[m³] |
405,000 |
21,600 |
27,600 |
21,600 |
0 |
|
Environ. externalities (1999 value) [million
euro] |
12.15 |
1.07 |
1.10 |
1.36 |
0 |
|
production [tons/year] |
40,000 |
37,132 |
37,266 |
37,199 |
0 |
|
profits‡(20% premium price quality) [million
euro] |
64 |
47 |
64 |
56 |
0 |
|
% externalities |
19% |
1.5% |
1.7% |
1.6% |
0 |
|
| |
|