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研究基于鄱阳湖渔业资源调查数据,运用软件Fi SAT II对翘嘴鳜的生物学参数及其资源量进行了初步估算。结果显示,鄱阳湖翘嘴鳜体长范围为77?526 mm;体长和体重的关系式为W=1.888?10?5L3.042(R2=0.951,n=577),von Bertalanffy生长方程的各参数为:渐进体长L∞=551.25 mm,生长系数K=0.210,理论生长起点年龄t0=?0.601。总死亡系数Z=1.06/a,自然死亡系数M=0.44/a,捕捞死亡系数F=0.62/a,最适开捕体长为150 mm。鄱阳湖翘嘴鳜开发率E=0.58,处于资源过度利用状态。鄱阳湖翘嘴鳜的初始资源量估算高达1.92?104 t,最大可持续产量MSY为4384.93 t。鄱阳湖翘嘴鳜群体中补充群体和低龄剩余群体的比例明显增加,低龄化和小型化趋势凸显,资源衰退问题突出,但生长潜力依然存在。应采取降低对鄱阳湖翘嘴鳜繁殖群体的捕捞强度、保护产卵场等积极措施来保护这一珍贵的渔业资源。
Based on the survey data of Poyang Lake Fishery Resources, the software Fi SAT II was used to estimate the biological parameters and resources of Cephalosporium albopictus. The results showed that the body length of Pseudostellaria tabaci from Poyang Lake ranged from 77 to 526 mm. The relationship between body length and body weight was W = 1.888 × 10 ~ 5L3.042 (R2 = 0.951, n = 577). The von Bertalanffy growth equation The parameters are: asymptotic body length L∞ = 551.25 mm, growth coefficient K = 0.210, theoretical starting point of age t0 =? 0.601. The total mortality coefficient Z = 1.06 / a, the natural mortality coefficient M = 0.44 / a, the fishing mortality coefficient F = 0.62 / a, and the optimum capture length was 150 mm. Poyang Lake Crested Ibis development rate E = 0.58, in the state of resource over-utilization. The estimated initial resource of Poyang Lake Crested Ibis is 1.92? 104 t and the maximum sustainable yield MSY is 4384.93 t. Poyang Lake Culter alburnus population supplemented groups and younger remaining groups significantly increased the proportion of younger and more prominent trend of miniaturization, resource decline prominent, but the growth potential still exists. Measures should be taken to reduce the fishing intensity of the breeding population of Culter alburnus in Poyang Lake and to protect the spawning ground so as to protect this precious fishery resource.