EFFECT OF EGG SIZE ON INCUBATION-TIME AND ALEVIN AND FRY SIZE IN CHUM SALMON (ONCORHYNCHUS-KETA) AND COHO SALMON (ONCORHYNCHUS-KISUTCH)
EFFECT OF EGG SIZE ON INCUBATION-TIME AND ALEVIN AND FRY SIZE IN CHUM SALMON (ONCORHYNCHUS-KETA) AND COHO SALMON (ONCORHYNCHUS-KISUTCH)
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DOI：
10.1139/z85-125
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发表时间：
1985-01-01
影响因子：
1.4
通讯作者：
MORLEY, RB
中科院分区：
文献类型：
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作者：
BEACHAM, TD;WITHLER, FC;MORLEY, RB
研究了大马哈鱼（O. keta）和蓝鲑（O. kisutch）的孵化时间、卵黄外源吸收时间（“扣上”）、卵黄蛋白大小和煎炸尺寸对初始卵大小的影响。两种的卵大小、孵化时间（从孵化到出巢的阶段）和吸收外源蛋黄的时间均无显著差异。对于这两个物种来说，从大鸡蛋中孵化出来的卵黄比从小鸡蛋中孵化出来的卵黄更长，蛋黄量也更多。叶片的组织质量无明显差异。在整个卵黄期，两组卵黄的大小差异保持不变，且在吸收外源卵黄时比孵化时更大。在外源卵黄吸收下，大卵的苗（新出的、自由游动的苗）比小卵的苗有更大的组织重量。[由于产卵时的大小影响游泳能力、对捕食者的敏感性和生长，因此初始卵大小的变化可能是鲑鱼种群动态的一个重要因素]。
Variability in hatching time, time of exogenous yolk absorption ("button up") of alevins, alevin size, and fry size was investigated with respect to initial egg size for chum salmon (O. keta) and coho salmon (O. kisutch). There was no significant difference with respect to egg size in hatching time of the alevins (stage between hatching and emergence from the redd) or time of exogenous yolk absorption for either species. For both species, alevins hatching from large eggs were longer and had greater amounts of yolk than those hatching from small eggs. Tissue weights of the alevins were not different. The differences in size between these 2 groups of alevins were maintained throughout the alevin stage and were greater at exogenous yolk absorption than at hatching. Fry (newly emerged, free-swimming young) derived from large eggs had greater tissue weight at exogenous yolk absorption than those derived from small eggs. [Since size at emergence influences swimming ability, susceptibility to predation and growth, variability initial egg size may be a significant factor in population dynanics of a salmon stock].