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洪湖黄颡鱼生物学的研究及洪湖鱼类小型化问题的初步探讨
马骏
Subtype博士
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本文根据作者从1987年3月至1988年3月在洪湖收集的大量资料整理而成。用常规的生物学分析方法,研究了洪湖黄颡鱼的生物学特性,对目前我国在黄颡鱼生物学方面所缺乏的一些内容,尤其是有关年龄和生长的问题,作了较为详细的补充。本文的主要内容包括:(1)洪湖黄颡鱼的年龄结构、实测年龄与渔获物体长组成的拟合度,生长及长推算,体长与体重的关系。(2)黄颡鱼的食性,食物组成,摄食强度及食物变换。(3)黄颡鱼的分批产卵习性,繁殖力与体长、体重的关系,繁殖群体的性比及组成。在此基础上,初步探讨了引起洪湖鱼类小型化的可能原因,希望能为将来进一步深入研究湖泊鱼类小型化问题提供一定的客观依据和研究线索。
Other AbstractSamples used in the work were collected during April 1987-March 1988 in Honghu Lake. 729 specimens were studied for age structure and growth of the catfish, 1095 for the feeding, and 340 for the spawning of female. The age determinated from Neural Complex shows that age composition of the male is made up of 5 age groups, and the female of 4. Individuals of 1 and 2 age groups in male and female are 71.3%, 77.6% respectively. Growth rate of male is different from the female's, the VBGF for the former could be written as: Lt = 287 |1 - exp(-0.1581 (t + 1.19))| where Lt in mm, t in age-year. Length-weight relationship is described by the function: W = 4.9271 * 10~(-2)L~(2.5731) where W in gram, L in cm. Fitnees degree of the determinated age distribution to the length group distribution of catch in female is more than that in male, it is that length variance probably relates to the fitnees degree. Food habit changes with life stages. The catfish of 10-30 mm have Cladocera and Chironomids for their main foods, those of 30-80 mm are keen on shrimps and small fish, water insects are greater part of the catfish diet which body length are over 80 mm. Spawning stage is from the middle period of May to the first period of August. Reproduction occures in 2 batches. Age of mature is 1 year. Relationship of fecundity and age is shown in a linear line: F = 576.7 t + 903.5 where F is number of eggs, t is age. Relationship between fecundity and body length presents: F = 4.56 * 10~(-3)L~~(2.78) where F is number of eggs, L in mm. Spawning stock, which sex ratio (female:male) is 0.87:1, is composed of remainder stock and recruitment stock, and the latter is approximately half of the former. The recruitment stock is constructed by individuals of 1 age and part of 2, the remainder stock includes individuals of great many with 2 age and all other ages. The concept of fish diminution is a phenomenon that product of any age group in one year is less than that of corresponding age group in optimum growth year. In the concept, the product is result of weight multiplied by length. Features of fish population with diminution are expressed in three aspects: 1. young individuals take an absolute dominant position. 2. size of individuals developing to mature becomes small. 3. population abundance increases. Causes leading to the fish diminution may be: 1) free degree of spatial niche; 2) water temperature, 3) fishing intensity, 4) structure of fish community, 5) probability of catching food.
Pages43
Language中文
Document Type学位论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/12766
Collection学位论文
Recommended Citation
GB/T 7714
马骏. 洪湖黄颡鱼生物学的研究及洪湖鱼类小型化问题的初步探讨[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.
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