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Preliminary study on the numerical models and related factors in fisheries catch and biomass


, : Preliminary study on the numerical models and related factors in fisheries catch and biomass. Zhongguo Haiyang Daxue Xuebao ; 35(3): 375-381 (Sum 140)

Recruitment in fish populations is one of the key problems in the long-term fishery forecast. This paper introduces the stock recruitment model (i. e. a density dependent process) into the catch per unit recruit model and biomass per unit recruit model, and introduces white noise to simulate the changes in their environments. Results show that the work (1) can explicitly illustrate the possibility of stock collapse, and estimate the level of fishing mortality at which it may occur; (2) can estimate the maximum sustainable yield in absolute terms; (3) can simulate the effects of environment changes on the relationships of relationships of catch-fishing mortality and catch-spawning biomass with the introduced white noise. Although the stock-recruit relationship is largely an assumption, more research is needed for the compensation mechanism between spawning stock and recruit.

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