嘉陵江瓦氏黄颡鱼的繁殖生物学  

THE ON REPRODUCTIVE BIOLOGY OF PELTEOBACRVSVACHELLI IN THE JIALING RIVER

作　　者：杨家云[1] 

机构地区：[1]四川三峡学院生物系

出　　处：《西南师范大学学报（自然科学版）》1994年第6期639-645,共7页Journal of Southwest China Normal University(Natural Science Edition)

摘　　要：通过对瓦氏黄颡鱼周年渔获物标本的生物学分析和对其产卵场的调查研究，结果表明，雌鱼的性成熟系数为２．３５％～３０．４４％，平均为１３．１２％；雄鱼的性成熟系数０．６５％～１．９８％，平均为０．９２％。５月中旬至７月中旬为其产卵期，盛期在６月，属于一次性产卵类型。最小性成熟年龄为２龄。最小性成熟个体雌鱼体长１１．３ｃｍ，体重２５．３ｇ；雄鱼体长１１．２ｃｍ，体重２４．１ｇ．繁殖群体雌雄性比为１：１．１７．体长１１．３～１７．９ｃｍ，体重２５．３～１０１．４ｇ的个体绝对繁殖力为１２４８～１２４１７粒，平均３８８３粒，与体长Ｌ的关系式为Ｆ＝３．３６７３×Ｌ￣（２．６４８３）与体重Ｗ的关系式为Ｆ＝５６．８０７０×Ｗ￣（１．０７５９）．成熟卵粒卵径为１．４１～１．８７ｍｍ．繁殖群体的年龄组成以３龄为主，２龄次之，以补充群体占优势，还提出了保护这一资源的建议．The present paper deals with the repreductive biology of Pelteobagrus uachelli (Richardson). The go-nadosomatic index (GSI) of the females vary from 2. 35%～30. 44 % and 13. 12% on the average;The GSI of malee vary froni 0. 65～1.98%, and 0. 92% on average. The GSI of the femaleshows a perak in a year , while decreases obvioush in other seasons,meanwhile two peats of the mdewere observed in a one-year cycle and these two peaks are from April to June and from Ausost toSeptember reepoctively. The absolute fecundities were from 1 248～12417,and 3 883 on average.By using electronie computer,the correlation formulae of the absolute fecundity to body length to bodyweight and to the age were F=3.3673× L￣(2.6483),F=56. 807 0 × W￣(1.0759) and F= 6970-345 5 t+826 t￣2. respectively the catfish spowned from middle May to middle July, and has a single period ofspawing a year. There has no significant differences between the sex ratio in spawning season and thatin non-spawmns season. The sex ratio of males vs. females was 1.13 : 1 . Male and female distin-guished by the preeence of senital popital in male. Age at first maturity is 2 year-old. The minimumsizes of adult male is 11.2 cm in length and 21. 1 g in weisht; while that of adult female is 11.3 cmin length and 25.4 g in weight. Statistical analysis of the maturing condition of the catch shows thatthe majority of the 2 year-old fishes have not matured , but most of the 3 year-old fishes the and all the4 year-old fishes ones had niatured. The ase composition of the breeding population maiuly consists ofthe 3-aged and 2-ased sroups. which means the supplementary population dominatea the breeding popu-lation. Based on its repreductive biological characterisics and fishins situation at present in Jialing Riv-er, some proposals for the protection were also put forward in this paper.

关 键 词：鱼纲 瓦氏黄颡鱼 Chang科 繁殖生物学 

分 类 号：Q959.4[生物学—动物学]