论文部分内容阅读
本文用von Bertalanffy生长方程研究浙江近海渔场大黄鱼的生长规律,得出: 1.大黄鱼符合均匀生长的假定,一般生长型可用von Bertalanffy生长方程描绘。 2.体长生长速度是随年龄递减的。体重生长速度,4龄前生长迅速,4龄时出现拐点,4龄后生长转慢。 3.渐近体长随资源量减少而增大,其关系式为L_∞=574.9—0.003697N。 4.大黄鱼的捕获年龄从3—5龄推迟到5龄后,对保护资源,提高产量具有现实意义。
In this paper, using the growth equation of von Bertalanffy to study the growth of large yellow croaker fish in Zhejiang offshore fishing ground, we can draw the following conclusions: 1. The large yellow croaker accords with the assumption of uniform growth. The general growth type can be described by von Bertalanffy growth equation. Body length growth rate is decreasing with age. Weight growth rate, rapid growth before the age of 4, 4 inflection point, after 4 years of growth slow. Asymptotic body length increases with the decrease of resources, the relation is L_∞ = 574.9-0.003697N. 4. After the fishing age of big yellow croaker was postponed from 3-5 to 5 years old, it is of great practical significance to protect resources and increase output.