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首页> 外文期刊>Aquaculture Reports >Effects of environmental factors on growth, survival, and metamorphosis of geoduck clam (Panopea japonica A. Adams, 1850) larvae
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Effects of environmental factors on growth, survival, and metamorphosis of geoduck clam (Panopea japonica A. Adams, 1850) larvae

机译：环境因素对象拔蚌蛤仔（Panopea japonica A. Adams，1850）幼虫生长，存活和变态的影响

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摘要

A series of experiments were conducted to evaluate the effects of temperature, salinity, diet, and stocking density on the growth, survival, and metamorphosis of geoduck clam Panopea japonica larvae. The larvae all died at a temperature of 22^oC after day 12, suggesting that the larvae of P. japonica could not survive when the temperature was higher than 22^oC. P. japonica could be incubated at 19^oC for the fast growth, high survival and metamorphosis of larvae. The embryos all died when the salinity was below 25 ppt. The larvae showed poor survival when the salinity was below 25 ppt, with all larvae dying before day 12, suggesting that larvae are sensitive to low salinity. The optimum salinity for the growth, survival and metamorphosis of larvae was 32 ppt. The use of a mixture of Isochrysis galbana and Nitzschia closterium (1:1) as a food source for the P. japonica larvae improved their growth, survival, and metamorphosis. A density of 20 individuals/ml appeared to be optimal for normal D-larvae of Panopea japonica, and 3-9 larvae/ml ^was optimal for the growth and survival of the P. japonica larvae raised in the hatchery.
机译：进行了一系列实验，以评估温度，盐度，日粮和放养密度对象拔蚌蛤子番石榴幼虫生长，存活和变态的影响。在第12天后，幼虫在22℃的温度下全部死亡，表明当温度高于22℃时，日本对虾的幼虫不能存活。粳稻可以在19℃下孵育，以使幼虫快速生长，高存活率和变态。当盐度低于25 ppt时，所有胚胎均死亡。当盐度低于25 ppt时，幼虫的存活率很低，所有幼虫在第12天之前就死亡了，这表明幼虫对低盐度敏感。幼虫生长，存活和变态的最佳盐度为32 ppt。球形等鞭虫和Nitzschia closterium（1：1）的混合物用作日本对虾幼虫的食物来源可改善它们的生长，存活和变态。密度为20个人/毫升似乎是正常的日本番石榴D-幼虫的最佳密度，而3-9个幼虫/ ml ^是最适合孵化场中饲养的日本假单胞菌幼虫的生长和存活的密度。

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