We applied widely used length-based data limited assessment methods. We specifically considered the Froese sustainability indicators, the fishing mortality ratio and the spawning potential ratio.
We found consistent indication that the corvina reina fishery in the upper Gulf (Zone 201), is in a state of over-exploitation. |
We developed an age-structured model for corvina reina. Age-specific survival rate was estimated based on control variables that represent different management approaches.
We explored the net present value of two scenarios over 20 years, with a discount rate of 9%: perfect compliance with current regulation and perfect compliance with the regulation that would maximize profits, holding the status quo to a zero profit open access equilibrium.
We explored the net present value of two scenarios over 20 years, with a discount rate of 9%: perfect compliance with current regulation and perfect compliance with the regulation that would maximize profits, holding the status quo to a zero profit open access equilibrium.
Profits increased under both scenarios among all management approaches. Perfect compliance with existing management project benefits ranging from 1.6 to 2.4 million USD in NPV. Increasing size selectivity showed the highest potential gains under regulation adjustment. The maximum gains to the fishery were model through a combined policy of an 8% reduction in effort and minimum size of 75cm. Overall, we expect 2.5 million USD in losses due to non-compliance and an additional 1.1 million due to sub-optimal economic design. |