池养条件下卵形鲳鲹仔、稚鱼生长与摄食特性

Feeding Habits and Growth Characteristics of Larval and Juvenile Trachinotus ovatus in Pond

对人工培育的卵形鲳鲹Trachinotus ovatus早期发育阶段的摄食与生长特性进行了观察与分析,结果表明:每日8:00—10:00及16:00—18:00卵形鲳鲹的饱满指数相对较高,卵形鲳鲹摄食节律属于晨昏型,仔鱼出膜后的13、18、23、28、35日龄卵形鲳鲹的日摄食率分别为43.04%、37.76%、37.64%、25.47%和22.12%,呈现逐步下降趋势;卵形鲳鲹仔、稚鱼全长(L)与日龄(t)回归方程为L=0.022 1t2-0.209 3t+2.803 1,R2=0.979 6,体高(h)与日龄(t)回归方程为h=0.013 3t2-0.169 0t+1.515 1,R2=0.980 6,体质量(m)与日龄(t)回归方程为m=0.2×10-6t3.998 8,R2=0.939 8,全长(L)与体质量(m)关系式为m=0.000 4L2+0.004 8L-0.023 2,R2=0.992 3.

Feeding habits and growth characteristics of larval and juvenile Trachinotus ovatus were studied in pond, and the results showed that the fullness index of T. ovatus was relatively higher at 8：00--10：00 and 16：00--18：00 in one day, Therefore, it showed that the daily feeding rhythm appeared to be morningdusk feeding model. The daily feeding rates were 43.04% ,37.76% ,37.64% ,25.47% and 22. 12% at the 13^th, 18^th,23^th, 28^th, 35 ^th day, respectively, which had a gradually decrease trend. The relationship between total length and day age could be expressed as L =0.022 It^2 -0. 2093t ＋2. 803 1,R^2 = 0. 979 6,that between body height and day age as h =0. 013 3t^2 -0. 169 0t ＋ 1. 515 1 ,R^2 =0. 980 6, that between body mass and day age as m = 0. 2 × 10^- 6t^3.9988 , R^2 ： 0. 939 8, and that between total length and body mass as m =0. 000 4L^2 ＋0. 004 8L -0. 023 2,R^2 =0. 992 3.