Study on the Morphological Development and Growth Characteristics of Percocypris pingi pingi(Tchang)Larva in the Middle Rea-ches of Jinsha River
In order to explore the development characteristics of Percocypris pingi pingi(Tchang)larva,the observation was made on the de-velopment stages of P.pingi pingi.The morphological characteristics of P.pingi pingi in different development stages were described in detail,the growth and development characteristics were analyzed.The results indicated that the total length and body length of the newly larvae of P.pingi pingi were 9.24 and 8.97 mm respectively.P.pingi pingi began to feed from 8 day-age,the feed-intake rate was 10%.The absorption of yolk sac finished at 9-day-age.Fin ray differentiation basically finished at 34-day-age and entered into juvenile fish stage(total length 27.04 mm,body length 22.13 mm).The growth model of larva was y=0.005 9x2+0.322x+10.09(R2 =0.99).The inflexion points of growth change from fast to slow appeared at 8 day-age.
万方数据
维普
