Effects of temperature on hatchability, development and growth of eggs and yolksac fry of Oreochromis mossambicus (Peters) under artificial incubation
Effects of temperature on hatchability, development and growth of eggs and yolksac fry of Oreochromis mossambicus (Peters) under artificial incubation
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人工孵化温度对莫桑比克鱼卵及卵黄囊鱼苗孵化率、发育及生长的影响
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
C. Sommerville
中科院分区：
文献类型：
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作者：
R. Subasinghe;C. Sommerville
.口孵罗非鱼的卵和卵黄囊鱼苗。在不同温度条件下，对莫桑比克罗非鱼Oreochromis mossambicus（Peters）进行了人工育苗试验。在控制条件下研究了孵化率、卵的胚胎发育和卵黄囊鱼苗的生长。结果表明，该菌的致死温度上限为0.莫桑比克卵的最低致死温度为40°C以上，最低致死温度为11°C至17°C。对于卵黄囊鱼苗，这些值分别在34和40°C以及17和20°C之间。在24.3 ~ 34.0 ℃温度范围内，鱼苗成活率接近100%，而在20 ℃温度范围内，成活率低于60%。在20和34.5 °C之间的温度下，直到孵化后10天，鱼苗的体细胞生长速率被提出，并发现差异显着。在34.6 °C下，在孵化后6-9天期间记录到负SGR，但在前6天期间，该温度下的SGR比20°C高4倍以上。在升高的温度下，蛋黄的利用更快，观察到的体重减轻是由于饥饿。在人工饲养条件下孵育时应考虑到这一点，以便最适当地开始外源性喂养。
. The eggs and yolk sac fry of the mouth brooding tilapia. Oreochromis mossambicus (Peters), were artificially reared in an experimental hatchery system at different temperatures. The hatchability, embryonic development of eggs and growth of yolk sac fry were studied under controlled conditions. It was shown that the upper lethal temperature for O. mossambicus eggs was above 40°C and the lower lethal temperature between 11°C and 17°C. For yolk sac fry these values lay between 34 and 40°C and 17 and 20°C respectively. Fry survival between 24·3 and 34·0°C was near to 100% while al 20°C it was less than 60%. The somatic growth rates of fry at temperature between 20 and 34·5°C up to 10 days post hatch are presented and were found to differ significantly. At 34·6°C a negative SGR was recorded during the period 6–9 days post hatching, but, during the first 6 days, the SGR at this temperature was more than four times higher than at 20°C. At the elevated temperatures, the utilization of yolk is faster and the loss of weight observed was due to starvation. This should be taken into account when incubating under artificial rearing condition so that initiation of exogenous feeding is timed most appropriately.