论文部分内容阅读
对于东海带鱼Trichiurus haumela(Forskl)生殖力的研究曾有过专题报道和零星记载,上述报道是以雌鱼在一个生殖季节中仅产一次卵为依据的,年龄鉴定谴存在问题。根据近年研究证明,带鱼在一个生殖季节中不止产卵一次。本文就东海带鱼生殖力及其变动特点作了分析和讨论,试图说明带鱼生殖力变动的主要特点以及环境条件变化时,生殖力变化的某些特点。对多次产卵鱼类生殖力研究的某些方法仅是探讨,还很不成熟,尚有待深入研究。本文所用材料系取自1976年5—6月底拖网渔轮在东海海礁产卵场的渔获物,共观察了360余尾雌鱼标本,卵巢成熟度分别为Ⅳ,Ⅵ期(已部分排过卵,相当于通常所说的
Studies on fecundity of the Trichiurus haumela (Forskl) in the East China Sea have been reported in the form of sporadic reports and sporadic records. The above report is based on the fact that females produce only one egg in a reproductive season, and age identification remains a problem. According to recent studies have shown that octopus spawning time in more than one time. This paper analyzes and discusses the reproductive capacity and its variation characteristics of octopus in the East China Sea. It tries to illustrate the main features of the changes of the reproductive capacity of the octopus and some characteristics of the fecundity changes when the environmental conditions change. Some methods for studying the fecundity of spawning fish have only been discussed and are still immature yet to be further studied. The material used in this paper is from the catches of trawlers at the spawning grounds of the East China Sea at the end of May-June 1976. A total of 360 female fish specimens were observed. The ovary maturation rates were Ⅳ and Ⅵ, respectively Eggs, equivalent to what is commonly called