月鳢年龄与生长的研究

Studies on age and growth of Channa asiatica

月鳢鳞片可作为年龄鉴定的依据,其年轮形成时期在4～6月。鳞长与体长呈直线关系,体长和体重呈幂函数关系。月鳢2龄以前生长较快,2龄以后生长逐渐减慢,其生长适合于VonBertalanffy生长方程。为有效保护月鳢资源,应限制捕捞体重在200g以下的个体。

The scales of Channa asiatica were used for its age determination.It was found that the new annual ring began to appear mostly from April to June.The relationship of scale length with body length is linear, and the relationship of body length with body weigth is exponential. The fish grew much more quickly before 2 years of age than after that. The growth of C. asiatica corresponds with Von Bertalanffy's growth equation. For the purpose of resource conservation, it is necessary to regulate a minimum legal harvestable age of 2.6 years old and weight of 200 g.