网湖鲫鱼的生长与资源评估

THE GROWTH AND STOCK ASSESSMENT OF CARASSIUS AURATUS AURATUS L. IN WANGHU LAKE

根据1984—1986年在湖北省网湖进行渔业资源调查的资料,应用Von Bertalanffy生长方程描述该湖鲫鱼的生长模式,同时按照Joneo体长股分析模型和Thompson-Bell体长预测模型分别推算鲫鱼资源量和不同捕捞强度下资源量和渔获量的理论值,并求得最大持续渔获量。据此,对该湖鲫鱼资源的合理开发和利用进行了分析和讨论,并提出渔业对策。

This paper deals with the growth and stock assessment of Cassius auratus aurlus L. collected from Wanghu Lake during December 1984 to May 1986. The relation between the body weight and body length can be expressed in terms of the power function equation: W = 4.2184 ×10^(-5)L22.9274. The growth equation is Lt = 285. 82[1 - e^(-0.2640(1+0.1213))] and Wt = 653. 30[1 - e^(-0.2640(1+0.1213))]2.9274 . The coordination of inflexion point is at li = 3. 95Yr and Wi = 192. 41 g. Using Jones length-based cohort analysis, the standing stock size and biomass were estimated to be 1. 0905×10~6 in number and 53355kg respectively. The theoretical abundance and yield were also calculated under different fishing intensities in accordance with Thompson-Bell predictive. In order to maintain a sustaining fisheries, a discussion on the rational exploitation of the stock has been proposed.