于2003~2004年对人工培育的斜带石斑鱼(Epinephelus coioides)仔鱼、稚鱼和幼鱼的生长和摄食进行了研究.在水温28.5~31.0℃,盐度31.4~34.3条件下,初孵仔鱼经39 d培育变态为幼鱼.全长(L/mm)与日龄(D/d)的关系式为L=2.039 8e0.076 7D;体质量(M/mg)与日龄(D/d)的关系式为M=0.065 8e0.252 8D;全长(L/mm)和体质量(M/mg)的关系式为M=0.006 5L3.267 3.对170尾仔、稚、幼鱼的解剖观察结果表明,摄食率达95.88%,饱食率达77.65%.饱食量(F/mg)与体质量(M/mg)呈直线相关,F=0.043 3M-0.003 9,大多数仔稚鱼在30 min内可以饱食.仔鱼对轮虫的消化时间为1~2 h,稚鱼对卤虫无节幼体和桡足类的消化时间分别为1.5~3 h和2~4 h.斜带石斑鱼仔稚鱼的摄食强度具有明显的昼夜节律性,仔鱼白天摄食、晚上不摄食,前期仔鱼在8:00和18:00摄食量较大,后期仔鱼在8:00和16:00摄食量较大,稚鱼昼夜均摄食,摄食高峰期出现在中午12:00.Growth and feeding of larva and juvenile of Epinephelus coioides were studied during 2003 and 2004.The larvae developed to young fish 39 days after hatching under the conditions of temperatures of 28.5~31.0℃ and salinities of 31.4~34.3.The relationship between the total length(L/mm) and day age(D/d) was counted to be L=2.039 8e~(0.076 7D),the relationship between the body mass(M/mg) and day age(D/d) could be expressed to be M=0.065 8e~(0.252 8D),and the relationship between the total length(L/mm) and body mass(M/mg) was calculated to be M=0.006 5L~(3.267 3).Based on the determination of 170 individuals,the percentage of stomach with food was 95.88% in the experimental conditions,and the percentage of stomach full with food was 77.65%.Amount of food in full stomach(F/mg) and the body mass(M/mg) could be expressed to be F=0.043 3M-0.003 9.Most of larvae and juvenile could spend less than 30 min on feeding from empty to full in stomach,the larvae spend 1~2 h on digesting rotifers from full to empty in stomach,and the juvenile spend 1.5~3 h on digesting artemia nauplii and 2~4 h on digesting copepods from full to empty in stomach.Feeding intensity was obviously different during day and night,the higher feeding intensities of early-stage larvae were at 8:00 and 18:00,while the higher feeding intensities of lately-stage larvae were at 8:00 and 16:00,and the higher feeding intensity of juvenile was at 12:00.It turn out that larvae were feeding only on day,not at night.863计划(2003AA603011);; 福建省重大科技项目(2002N009)资
