摘要
长江干流重庆木洞江段长鳍吻的渔获物中1～3龄个体占绝大多数.新年轮形成时间在3-6月.体长与鳞径成直线相关,体长与体重成指数相关,体长生长速度随年龄增加而逐渐减慢;体重生长拐点年龄为3.29,拐点年龄前体重随年龄增加而增速增长,拐点年龄后则减速增长;1～4龄为长鳍吻鮈快速生长期.秋季丰满度和脂肪系数均高于冬季.繁殖群体主要为1～4龄,绝对繁殖力随体长和体重的增加而增加,相对繁殖力随体长、体重的增加而减少.生态策略趋向于r-选择,长江干流的长鳍吻鮈处于过度捕捞状态.
Five hundred and seventy specimens of 1 - to 3 - year - old Rhinogobio ventralis （ Sauvage et Dabry ） used in this study were collected at Mudong, a town located in the mid -upper reaches of the Changjiang River from March 1998 to May 1999. Most of the annual rings formed from March to June. Regression analysis showed that body length was correlated positively with the radius of tile scale and exponentially with weight, with an inflexion of the weight growth curve at the age of 3.29 years. Its growing velocity decreased with age. The first 4 years of its growth was the fastest growing period of the fish. Its absolute fecundity increased with its body length and weight, while its relative fecundity decreased with the increase in body length and weight. The ecological strategy of the fish species appeared to tend to r - selection.
出处
《西南农业大学学报（自然科学版）》
CSCD
北大核心
2005年第5期704-708,共5页
Journal of Southwest Agricultural University
基金
三峡工程建设委员会环境保护补偿经费科研类资助项目:(Sx(97)-17)/HBGC长江鱼类早期资源调查方法及鱼苗鱼种鉴定研究课题
关键词
长江干流
长鳍吻鮈
年龄
生长
繁殖
The Chaingjiang River
Rhinogobio ventralis （ Sauvage et Dabry）
age
growth
fecundity
