Estimation of larval stage determining the appearance of albinism in Hatchery-reared juvenile flounder Paralichthys olivaceus
Estimation of larval stage determining the appearance of albinism in Hatchery-reared juvenile flounder Paralichthys olivaceus
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幼虫阶段的估计决定了孵化场饲养的牙鲆幼鱼白化病的出现
DOI：
10.2331/suisan.53.1107
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发表时间：
1987
影响因子：
0.4
通讯作者：
Takeshi Watanabe
中科院分区：
文献类型：
--
作者：
T. Seikai;M. Shimozaki;Takeshi Watanabe
用两种不同的摄食方法对褐牙鲆的幼鱼阶段进行了测定，确定了褐牙鲆幼鱼的体色（正常体色或白化幼鱼）。一种是投喂巴西卤虫无节幼体和轮虫，这两种动物很容易诱发高比例的白化。另一种是喂养野生浮游动物和轮虫，这通常会导致高比例的正常着色。将10日龄的幼虫分成8批，每批1000尾，采用2种投喂方法，在不同的生长阶段按不同的投喂方案投喂29-30 d。根据试验结束时正常着色率和白化率，将8个试验批次分为3组。在第一组（槽1-3）中，其中卤虫无节幼体在幼虫生长到D期之前被改变为野生浮游动物，观察到正常着色的百分比最高（60.2-75.4%）。第三组（5-8号池）从E期开始接受野生浮游动物，白化率最高（90.9-100.0%）。在第二组（仅4号罐）中，当幼虫发育阶段由25%D和75%E组成时，将野生浮游动物代替卤虫无节幼体给予幼虫，该组成与正常着色（27%）和白化（73%）的发生率一致。根据这些结果，推测D期是决定幼鱼体色的关键时期。
The larval stage of the flounder P. olivaceus, when their body color (normal coloration or albinism of juveniles) was determined, was estimated by two ways of feeding. One was to feed Brazilian Artemia nauplii and rotifers which induce albinism easily in a high percentage. The other was to feed wild zooplankton and rotifers which usually induce normal coloration in a high percentage. Larvae of 10 days old were divided into 8 lots of 1, 000 larvae each and were fed for 29-30 days on different feeding schedules at different growth stages by a combination of the 2 feeding methods. Based upon the percentage of normal coloration and albinism at the end of experiment, 8 experimental lots were divided into 3 groups. In the first group (Tanks 1-3) in which Artemia nauplii were changed to wild zooplankton before the larvae grew up to D stage, the highest percentage of normal coloration was observed (60.2-75.4%). In the third group (Tanks 5-8) fish began to accept wild zooplankton from E stage, the highest percentage of albinism was ob-served (90.9-100.0%). In the second group (Tank 4 only), wild zooplankton were given to larvae in place of Artemia nauplii when the larval developmental stages consisted of 25% D and 75% E, and this composition agreed well with the percentage occurrences of normal coloration (27%) and albinism (73%). From these results, D stage was estimated to be the critical stage deter-mining the juvenile's coloration in terms of kinds of live foods.