黄渤海蓝点马鲛个体生殖力的研究

本文根据1992～1993年黄渤海蓝点马鲛产卵期内采集的114个卵巢样品分析和组织切片观察，对其个体生殖力进行研究。结果表明，蓝点马鲛为分批排卵鱼类，在产卵期内排卵2～3次，个体绝对生殖力在45～5257千粒，个体组对生殖力和相对生殖力随年龄、体长、体重的生长逐渐增加，其中与年龄的关系最为密切。

STUDY ON THE INDIVIDUAL FECUNDITY OF MACKREL IN THE YELLOW SEA AND BOHAI SEA

This paper studies on the individual fecundity of the mackerel,Scomberomorus niphonius in the Yellow Sea and Bohai Sea, based on 114 ovaries collected from late May and early June in 1992 and 1993 , that 27 ovaries of them were observed through histologic method. The results are showed as follows: 1. The ova diameter can be graded into 5 size classes: the yolkless oocyte with a diameter of 0.007-0. 490 mm in the second phase, the small oocyte of 0. 364-0. 714 mm in the third phase, the middle oocyte of 0. 728-0.966 mm in the early fourth phase, the large oocyte of 0. 98o-1. 540 mm in the mid and late fourth phase, and the transparent oocyte of 1. 375-2. 030 mm in the fifth phase.2. According to the frequency distribution of ova diameter in the ovary, the ripe ova more than 1. 3 mm are released 2 or 3 batches during spawning period.The oocytes more than 0. 4 mm in the third phase may be matured succesively in late spawning season.3. The individual absolute fecundity is ranged from 45 to 5257 thousand. The relative fecundity is ranged from 62 to 770 eggs/g per unit body weight or from 66 to 957 eggs/g per unit net body weight. Both absolute and relative fecundities increase with the age, body length and body weight of the fish.