摘要
本文研究了真鲷 (Pagrosomusmajor)早期仔鱼的食性和食性转变。定量摄食实验研究发现 ,早期仔鱼的食性随其生长发育而发生明显的变化 ;真鲷虽为近海暖水性底层肉食性经济鱼类 ,但其前期仔鱼可摄食一些浮游藻类 (小球藻和螺旋藻 )。最大摄食率I[μg/(ind·h) ]随仔鱼的发育 ( 4～ 7日龄 )和食物种类而发生变化 ;对小球藻、螺旋藻、轮虫的最大I分别为 1.45～ 1.42、0 .49～ 1.3 9和 1.46～ 2 .51;早期仔鱼虽可摄食藻类 ,但仍以肉食性为主。在动物和植物混合食物 (轮虫 小球藻、轮虫 螺旋藻 )中 ,真鲷早期仔鱼存在食性转变 ,这对它的生存适应具有重要的生态意义。
Feeding habits and feeding switching of earlier larvae of porgy ( Pagrosomus major ) were studied. The quantitative feeding experiments showed that the feeding habit changed with the development of the larvae. The earlier larvae could feed on microalgal foods such as Chlorella sp. and Spirulina platensis although porgy is a carnivorous commercial fish living in neritic warm waters. The maximum feeding rate [ I ,μg/(ind.h)] varied with the development of the larvae (from 4 days old to 7 days old) and with the food items; I on Chlorella ranged from 1.45 to 1.42 , I on Spirulina increased from 0.49 to 1.39, and I on Rotifera increased from 1.46 to 2.51 . It was suggested that the earlier larvae were more carnivorous although it could ingest algal foods. When the larvae were placed in a mixture of animal and plant foods ( Rotifera Chlorella and Rotifera Spirulina ) in different percentages, the feeding switching phenomenon was found which was ecologically important for the survival of porgy larva in the waters.
出处
《台湾海峡》
CAS
CSCD
2000年第3期344-349,共6页
Journal of Oceanography In Taiwan Strait
基金
福建省自然科学基金!资助项目(C93051号)
