IHB OpenIR  > 学位论文
洪湖红鳍鲌生物学的研究及洪湖鱼类小型化的初步探讨
喻达辉
Subtype硕士
Thesis Advisor曹文宣
1988
Degree Grantor中国科学院水生生物研究所
Place of Conferral中国科学院水生生物研究所
Degree Discipline水生生物学
Abstract洪湖是一个大型浅水湖泊,面积53.25万亩。近年来由于生态环境的改变,洪湖的鱼类种类和数量发生了很大的变化。在渔获物中小型鱼类占90%左右,其中主要为鲫鱼、黄颡、红鳍鲌和乌鱧。为此笔者于1987年4月至1988年3月调查了其中之一的红鳍的生物学资料,并对这种小型化现象的形成原因作了初步探讨。结果如下:(1)年龄材料主要为鳞片,其年轮特征为切割型和疏密型。渔获物主要由2龄鱼组成,其中雌性最高龄为5龄,雄性为4龄,(2)生长缓慢,且在3龄处表现出阶段性生长现象。因此理论上的起捕年龄应在3龄以上;(3)1龄鱼少数达到性成熟,2龄鱼全部成熟,繁殖力变动在2475-80243之间,且随体长和年龄的变化而变化。分批产卵,产卵季节为5-8月;(4)肉食性,主要捕食小鱼、虾、摄食强度低,食物组成无季节性变化;(5)小型化现象的出现主要是由于环境的改变,一方面减少了大型鱼类的来源,一方面使另一些大型鱼类不能适应新的环境,结果大型鱼类减少,鱼类种间关系发生改变,使小型鱼类增加,其次过度捕捞使个体较大的大型鱼类减少从而破坏了其种群的正常增殖,使得小型鱼类得以大发展。
Other Abstract1916 specimens in total were sampled from April, 1987 to March, 1988 for the investigation of the age, growth, reproduction and feeding of C. erythropterus in Honghu Lake, a heavily weeded large shallow lake with 35,500 hectares in area, and the diminution phenomenon of fish species, namely, the dominancy of small-sized species in the catch, was preliminarily studied. The results are as follows: 1. The age can be determined on the scales; the annuli can be identified by the presence of "check" or by the transition from loosely-spaced circuli to the densely-spaced ones. The formation time of annuli is from late April to July. The main component in the catch of Culter erythropterus was 2-year-old fish, while the eldest was 5-year-old for female, and 4-year-old for male. 2. The growth rate was very slow and a inflexion in 3-year-old. The body length growth curve is a smoothly convex and gradually gets to its asymptote. L_α 32.05 cm in female, and 24.18 cm in male. The body weight growth curve is sigmoid and has a inflection when t = 3.4 year. The asymptotical weight is 414.908. So 3-year-old is the theoretical age of catching. 3. A few individuals could attain sexual maturity in the second year after hatching, but all matured in the third year. The fecondity changed in the range of 2.473--80.243 eggs, and varied with body length as well as age. The eggs matured to be laid in batches, (most in two batches). Breeding season is from May to early August. 4. The diet is listed. The main foods ingested were small fishes shrimps and rapidly digested in the fore part of the gut. The feeding frequency is low and the changes of feeding season is not apparent. 5. The diminution phenomenon is indicated by the sharp increase of small-sized fishes in the composition of the catch as a result of the decrease in the quantities of big-sized fishes because of environmental changes and over-fishing. The environmental alterations, such as obstruction of the passage between the river and the lake, great increments of aquatic plants, resulted in the extinction of migratory fishes in one hand and in another the decrease of big-sized, lake-inhabiting fishes for the difficulty in adaptation. Over-fishing may destroy the reproduction of big-sized fishes populations. These two aspects would decease the recruitments of big-sized fishes and increase the quantities of small-sized fish as result of evolvment of fishes community hierarchy.
Pages41
Language中文
Document Type学位论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/12728
Collection学位论文
Recommended Citation
GB/T 7714
喻达辉. 洪湖红鳍鲌生物学的研究及洪湖鱼类小型化的初步探讨[D]. 中国科学院水生生物研究所. 中国科学院水生生物研究所,1988.
Files in This Item:
File Name/Size DocType Version Access License
洪湖红鳍鲌生物学的研究及洪湖鱼类小型化的(1671KB) 限制开放--View Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[喻达辉]'s Articles
Baidu academic
Similar articles in Baidu academic
[喻达辉]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[喻达辉]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 洪湖红鳍鲌生物学的研究及洪湖鱼类小型化的初步探讨.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.