姚氏高原鳅的年龄结构与生长特性OA

The age structure and growth characteristics of 362 Triplophysa yaopeizhii speciments col-lected from the Anning River in Xichang were studied using otoliths for age determination.The main re-sults were as follows:the body length of T.yaopeizhii ranged from 4.1 to 10.7 cm,and the body weight ranged from 0.7 to 14.2 g.The age of the speciments ranged from 2 to 9 years,with 5～6 years being the dominant age group,accounting for about 42.27%of the total samples.The relationship between body length and body weight was described by the equation W=0.0126L2.9606(R2=0.961 9,n=362),indicating isometric growth characteristics.There was no significant difference in age,body length,or body weight between the female and male groups(P>0.05).The von Bertalanffy growth equation was used to fit the growth equation of body length and body weight as follows:Lt=10.415[1-e-0.155(t+1.750)],Wt=12.981[1-e-0.155(t+1.750)]2.9606.The inflection point occurred at 5.248 years of age,with a corresponding body length Li=6.895 cm and body weight Wi=3.827 g.The apparent growth index φ was 1.295.These findings indicate that the growth of T.yaopeizhii is slow and characterized by a long cycle.These results provide a founda-tional basis for the artificial breeding,stock enhancement,and resource conservation of T.yaopeizhii in the Jinsha River basin.