闽江口海蜇生长的研究

分别采用高次方程和指数高次方程模拟闽江口海蜇伞径和体重的生长，结果表明海蜇生长明显分３个阶段：５月１０日以前为缓慢生长期；５月１１日至７月３０日为快速生长期；７月３０日以后为衰老期，个体收缩，体重减轻；伞径和体重的最大值分别出现在８月５日和７月３０日；伞径和体重生长速度最大值分别在６月２日和６月２５日。据此确定闽江口海蜇最佳捕捞期７月３０日，最佳捕捞伞径４９４．１ｍｍ；合理开捕期７月２０日，开捕伞

A study on growth of Rhopilema esculenta in Minjiang Estuary

The growth of the diameter of the umbrella-part and body weight of Rhopilema esculenta are calculated using the power equation and the power exponential equation in the estuary of Minjiang River. The results show that the growth of Rhopilema esculenta can be divided into three phases. The growth is slower in the first phases before 10 May. The growth is faster in the second phases during 11 May to 30 July. It is the aged time of Rhopilema esculenta in the third phases after 30 July and the size of its body contracts in this time. The maximum measure of the dimension of the umbrella-part and the body weight of the Rhopilema esculenta occured 5 August and 30 July respectively. And the maximum velocity of growth of the diameter of the umbrella-part and body weight occured 2 June and 25 June. According to the character of growth of Rhopilema esculenta,the best theoretical date of fishing Rhopilema esculenta is determined 30 July and the best diameter of the umberlla-part is 494. 1 mm. The optimum actual begin date of Rhopilema esculenta fished is 20 July and the optimum diameter of the umbrella-part is 465. 8 mm.