A Multi-Species Management Model Combining Fishery Catchable Mesh Size and Fishing Effort

Abstract:

B-H model, a single-species management model, is not suitable for multi-species coexistence situation due to several limitations. In this paper, a multi-species management approach is created based on B-H model by replacing "catchable age" and "fishing mortality" of single species management model with "catchable mesh size" and "fishing effort" of multi-species management model to achieve multi-species management objective. The multi-species management approach was used to test with the two typical species of the East China Sea, hairtail and small yellow croaker based on literatures. The big differences in body shape and body size between hairtail and small yellow croaker and the small optimum yield overlapping area demonstrated that these two species are not suitable for the integrated management, which should be managed separately by different fishing areas or different fishing vessels. This model has merits like intuitive, easy-judging and timely but with limitations of short-term effectiveness and similar shape requirements. To promote the application of this multi-species management approach, it needs to further accumulate various basic data for the relevant elementary parameters, standardize fishing efforts and explore ways to improve the model accuracy.