Evaluation of Ecological Capacity of Fishery Enhancement Species of the Mainstream of the Yellow River in Henan Province, China

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Min Yang et al.

Abstract

In order to understand the ecosystem structure of the main stream of the Yellow River in Henan province, carry out scientific enhancement, and realize the effective conservation and restoration of the fishery resources of the Yellow River, according to the investigative data of fishery resources and ecological environment in the main stream of the Yellow River in Henan province from 2013 to 2016, Ecopath with Ecosim 6.5 software is used to establish the Ecopath model of the main stream of the Yellow River in Henan province, including 22 functional groups including Silver carp(Hypophthalmichthys molitrix), Bighead carp(Aristichthys nobilis), carp(Cyprinus carpio), crucian carp(Carassius auratus), Black carp(Mylopharyngodon piceus) and grass carp(Ctenopharyngodon idella).The results of the model were used to systematically analyze the overall characteristics of ecosystem functions; combined with the analysis results of food web structure and energy flow, the ecological capacity of typical enhancement species such as Silver carp(Hypophthalmichthys molitrix), Bighead carp(Aristichthys nobilis), carp(Cyprinus carpio), crucian carp(Carassius auratus), grass carp(Ctenopharyngodon idella), Black carp(Mylopharyngodon piceus) and bream(Pseudobrama simoni) was estimated. The results show that the ecosystem nutrition relationship in the main stream of the Yellow River in Henan province is relatively simple, the ecosystem's maturity and stability are low, and it is easily disturbed by external factors; the service and output functions of fishery resources are degraded.Without significantly changing the main energy flow and food web structure of the existing fishery ecosystem, this study estimates that the ecological capacity of Silver carp(Hypophthalmichthys molitrix),Bighead carp(Aristichthys nobilis), carp(Cyprinus carpio), crucian carp(Carassius auratus), grass carp(Ctenopharyngodon idella),Black carp(Mylopharyngodon piceus) and bream(Pseudobrama simoni) is respectively 12.76t/km2, 4.25t/km2, 0.478t/km2, 0.342t/km2, 9.31t/km2, 0.005t/km2and 0.283t /km2. Compared with the existing biomass in the ecosystem,Silver carp(Hypophthalmichthys molitrix), Bighead carp(Aristichthys nobilis), and grass carp(Ctenopharyngodon idella) all have a larger breeding space.

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