摘要
以人工孵化的黄颡鱼仔鱼为材料 ,对孵化 2 0d内的仔鱼的食性和生长进行了研究 ,实验结果表明 :黄颡鱼仔鱼 2日龄开始开口摄食 ,5日龄全部开口摄食 ,混合营养期为 1～ 4d。仔鱼的开口饵料以轮虫、枝角类为主。体长 8～ 2 2mm的仔鱼由轮虫、枝角类等浮游生物为主转变为以寡毛类、摇蚊幼虫、水蚯蚓等底栖生物为主 ,仔鱼昼夜摄食节率变化明显。仔鱼随着体长的增长肠胃饱满指数也逐渐增加。仔鱼的体长生长前期较快 ,后期减慢。体长与日龄的相关式为 :L=0 95 2 8d+4 97(r=0 992 0 )。体重与体长的回归曲线为W =6 4× 10 -4L2 2 56(r=0 9797)。
The article deals with the feeding and growth of larvae within 20 days,on the basis artificial hatched Pseudobagous fuluidraco. The results show as follows:the larvae of Pseudobagrus fulvidraco began to ingest two days later,and fully ingested five days later with a mixotrophy period is 1～4days.The bait mainly consisted of plankton,such as rofifer.When its ovevall length was 8～22mm,the bait would change to oligochacta,midage hydnic earthworm and other botlom fauna with the obvious diurnal rhythmicity.The gastrointestine plump index number increased gradually along with the length which developed faster in the earlier stage than in the later.The related formula of length and daily age is L =0.9528 d+4.97(r=0.9920).The regression curve of weight and length is W =6.4×10 -4 L 2 256 (r=0.9797).
出处
《水产科学》
CAS
北大核心
2002年第3期13-15,共3页
Fisheries Science
关键词
黄颡鱼
仔鱼
食性
生长
Pseudobagrus fulvidraco
food habit
growth
