Abstract
The bioeconomic management in a fishery with intra-species selectivity is examined. As opposed to other works, we consider a model in which the fishing technology affects resource`s growth not only through the production function, but also through the natural growth rate of the marine resource. The analysis is applied to the European Southern hake stock (merlucius merlucius). The activity of the fleets involved in the fishery has different impacts on marine resource and the degree of selectivity of their gears is included in the economic analysis. The results show that if this fleet improves its degree of fishing selectivity, the level for the marine resource will increase.
Highlights
There is considerable world-wide concern about the negative effects that the exploitation of fishing resources is having on the equilibrium of the marine ecosystem
It can be asserted that the fishing technology employed can affect the natural growth rate of the marine resource or alter the composition of fish populations (Lleonart and Recasens[1])
In the economic analysis of fisheries in which various fleets using different gear carry out their activity it is common to assume that such activity influences the net growth of the marine resources through the catches, while the natural growth function depends on the fish biomass and environmental conditions
Summary
There is considerable world-wide concern about the negative effects that the exploitation of fishing resources is having on the equilibrium of the marine ecosystem. In the economic analysis of fisheries in which various fleets using different gear carry out their activity it is common to assume that such activity influences the net growth of the marine resources through the catches, while the natural growth function depends on the fish biomass and environmental conditions. These conditions are usually assumed stable and constant (e.g., Armstrong and Clark[2]; Garza-Gil[3]; Garza-Gil et al[4]; Costa-Duarte et al[5]; Bjorndal and Lindroos[6])
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