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先按孵化密度的高低将四大家系的大马哈鱼(Oncorhynchus keta)鱼卵放在没有砂砾基质的孵化池内孵化,等孵出带卵黄囊鲑苗后,再按基质的有无将它们移入高低密度不同的孵化池内分别孵化,直到鲑苗发育成仔鱼为止。四大家系的胚胎存活率有着显著的差异,然而与孵化密度的高低却没有因果联系。低密度有基质孵化池内的鲑苗成活率高于低密度无基质孵化池,而且其质量也比高密度有基质或无基质孵化池的好。在低密度有基质孵化池内,鲑苗和仔鱼的卵黄囊畸形和卵黄体凝结现象最少,低密度孵化池内的鲑苗,其组织重量超过高密度孵化池。在低密度有基质孵化池内孵化出来的仔鱼比其它任何孵化池内的仔鱼长和重。通过对标准孵化池内的大马哈鱼鱼卵和带卵黄囊鲑苗密度的控制,能提高大马哈鱼仔鱼的存活率和质量。
First, according to the density of hatching, four families of Oncorhynchus keta fish eggs were hatched in a gravel-free incubator. After hatching the eggs with salmonella salivarius, they were moved according to the presence or absence of the matrix Hatch hatch with different levels of high and low hatching, until the salmon larvae developed into larvae. There are significant differences in embryo survival rate between the four major families, but there is no causal relationship with the hatch density. The survival rate of the salmon in the low-density matrix hatchery was higher than that of the low-density matrix-free hatchery, and its quality was better than that of the high-density matrix-free or incubator. In low-density matrix hatcheries, salmon shoots and larvae yolk sac malformations and yolk bodies coagulation phenomenon at least, low-density hatcheries within the salmon, the tissue weight than the high-density hatching tank. Larvae hatched in a low-density matrix hatchery are longer and heavier than larvae in any hatchery. Survival and quality of salmon larvae can be improved by controlling the density of salmon roe and yolk sac salmon in a standard hatchery.