摘要
用同1 尾雌鱼催产孵出的鳙鱼仔鱼进行了饥饿、光照对耳石沉积和日轮形成影响的实验研究。结果表明, 仔鱼全长生长饥饿组慢于对照组, 差异极显著( P < 0 .01) , D D ( 黑暗, 下同) 组、 L L ( 光照, 下同) 组与对照组接近, 无显著差异 ( P > 0 .05) 。耳石直径各实验组与对照组无显著差异 ( P > 0 .05) 。饥饿组仔鱼在体长生长停止的情况下耳石仍能继续沉积。仔鱼孵出后第2 d 形成第1 轮, 之后每天1 轮, 对照组16 日龄仔鱼耳石上有15 个日轮。饥饿组约90 % 的个体日轮数比对照组少20 % , 约10 % 的个体耳石日轮不明显。 D D 组、 L L 组耳石日轮数通常比对照组多1 ~2 个。实验结果说明饥饿一定时间后, 耳石日轮形成受阻。耳石日轮形成受内在的日周期性内分泌调控, 光周期只是日轮形成的伴随因子。
Effects of starvation and photoperiod on the otolith deposition and increments formation were observed in the larval big head incubated from fertilized eggs of same a femal fish. The total length of larva from starvation group grow significantly slow than control groups do (\%P<0.01\%), but the constant light (LL) and darkness (DD) groups approached to control groups significanty (\%P>0.05\%). The otoligh diameter of various test group was close with control groups. The otolith diameter of larva starvation group that could also be continual deposition under stagnated of body length. The initial daily growth increment in otolith was formed on the second day after hatched and continued on a daily schedule. There are 15 daily rings in otolith of larvae on 16 daily age of control group. The number of daily rings in otolith which about 90% individuals of starvation group was less 20% than control, however, daily rings in otolith 10% individuala was no obvious. The number of daily rings in otolith of DD and LL groups 1~2 more than contrast, respectively. The result in this study indicats that larva starved over 8 days disrupted increment formation. It seems, the increment was regulated by endocrinium of an endogenous circadian rhythm, while the photoperiod is only an accompanied factor for increment formation.
出处
《大连水产学院学报》
CSCD
1999年第3期1-6,共6页
Journal of Dalian Fisheries University
基金
国家自然科学基金
关键词
鳙鱼
仔鱼
耳石沉积
日轮形成
饥饿
光周期
big head
otolith
daily growth increment
starvation
photoperiod