江口水库红鲌鱼资源最大持续渔获量及其开发利用和控制方法的研究

Study on the Maximum Sustained Yield of Ery throculter of the Jiangkou Reservoir and It's Development,Utilization and Method of Control

本文采用剩余产量模式研究了江口水库红鲌鱼资源,其结果是:最大持续产量可达97.41吨,即比该库历史最高产的1986年还可增加94.9%,其相应努力量为标准化小渔船1700只,文中详述了利用红鲌鱼来吞食库中耗食量而经济价值不高的非放养小野杂鱼,减少天然饵料资源非有效流失,变危害最大的凶猛鱼类为利的一整套技术措施.

The paper discusses with the surplus yield model on the resource of Erythroculter ilishaeformis (Sleeker), E. monglicus (Basilewsky.), E. dabryi (Bleeker) of the Jiarjgkou reservoir. The result was that the maximum sustained yield (MSY) can be up to 97.41 tons, i.e. an increase of 94.9% than in 1986, the utmost quantity of catch in history, and its relevant fishing power equaled to 1700 standard fishing boats. The relatives between the total length of E. Hishae formis(Bleeker)(X) and the total length of Aristichthys nobilis (Rich.)(Y), which can be swallowed by E. ilishaeformis (B1), can be stated as: Y = 0.2011X-0.9401. And the relatives between the total length of E. monglicus (Bas.) (X) and the total length of A. nobilis (Rich.) (Y), which can be swallowed by E. monglicusare stated as: Y = 0.2796X-3.5197. Therefore, it is safe to put A. nobilis (Rich.) and Hypophthalmichthys molitrix (C. et. V.) in about 13.31-7-!6.7cm length into reservoirs or lakes , because the?. ilishaeformis (Bleeker) or E. monglicus f'Bas.) at their body-length of 50cm can't swallow them. Due to the E. ilishaeformis or E. monglicus fed at this time on small wild fishes, so they can be used to decrease those unuseful natural foodstuff and raise the living-rate of young cultured fish.