Fig. 7. Zebra mussel cultivation scenarios in the Oder (Szczecin) lagoon: a) impacts of increased fertilizer/animal feed market prices on the profitability of mussel cultivation in the lagoon, b) effects of additional income from nitrogen emission certificates (financial compensation/subsidy for removing nitrogen from surface waters) on profitability, c) financial compensation (subsidy) required to run profitable zebra mussel farms relative to the mussel cultivation area, d) N-removal costs of a 1000-ha (10-kmē) zebra mussel farm compared to average marginal N and P reduction coasts in the Baltic region relative to the target nutrient reduction level (after Gren et al. 2008).

Fig. 7