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A surplus production model based on the Fox surplus production function is suggested, which differs from previous such models in that the continuous, rather than discrete, form of the biomass dynamics equation is considered. The observation-error assumption is used to estimate the parameters of this model. The Marquardt algorithm is used as the minimization scheme for this nonlinear model. The model...
The paper reports on the basic characteristics of the catch composition, distribution and seasonal variation of setnet fisheries in the Yellow and Bohai Seas. There were 126 species in the samples, including 102 fish species, 17 crustaceans, 5 Cephalopoda, and 2 Medusa species. Both the number of species and biomass of the setnet catches show geographical variations. The fishery resources in the...
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