正趋光性是大鰤幼体下颌畸形的原因，Seriola dumerili (Risso, 1810)：通过在低亮度壁的水箱中饲养来缓解,Aquaculture Research

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正趋光性是大鰤幼体下颌畸形的原因，Seriola dumerili (Risso, 1810)：通过在低亮度壁的水箱中饲养来缓解
Aquaculture Research ( IF 1.9 ) Pub Date : 2020-03-25 , DOI: 10.1111/are.14571
Yoshifumi Sawada _{1,

2} , Tsukasa Sasaki ₂ , Keisuke Nishio ₃ , Michio Kurata ₁ , Tomoki Honryo ₁ , Yasuo Agawa ₁

Affiliation

颚部畸形是大鰤鱼 Seriola dumerili 鱼种的一个严重问题。为了制定针对这些畸形的对策，我们进行了幼虫行为测试以确定其根本原因，并研究了低亮度饲养箱壁控制其发生的能力。在水平照明的矩形透明水族箱（20 cm × 100 cm × 25 cm）中检查幼虫的分布，在孵化后 3 至 13 天（dph）提供这种照明后，它们的分布偏向于光源，表明正趋光性; 此响应在 22 dph 时消失（在 13 到 22 dph 之间没有数据）。观察到幼虫趋光性地游向光源并反复与水箱壁碰撞（壁面行为）。为了研究墙壁亮度控制下颌畸形发生率的能力，我们比较了饲养试验中它们的发生率与水箱壁的不同孟塞尔颜色值：2.11（黑色）、5.85（灰色）和 9.52（白色）。25 dph下颌畸形的发生率在低亮度壁的坦克中显着较低，即黑色、灰色和白色分别为5.8%、22.5%和26.8%。白色的幼虫围壁行为最强烈，其次是灰色和黑色。这些结果表明，正趋光性引起幼虫壁行为，导致颌畸形，而低亮度的水箱壁控制着这一过程。85（灰色）和 9.52（白色）。25 dph下颌畸形的发生率在低亮度壁的坦克中显着较低，即黑色、灰色和白色分别为5.8%、22.5%和26.8%。白色的幼虫围壁行为最强烈，其次是灰色和黑色。这些结果表明，正趋光性引起幼虫壁行为，导致颌畸形，而低亮度的水箱壁控制着这一过程。85（灰色）和 9.52（白色）。25 dph下颌畸形的发生率在低亮度壁的坦克中显着较低，即黑色、灰色和白色分别为5.8%、22.5%和26.8%。白色的幼虫围壁行为最强烈，其次是灰色和黑色。这些结果表明，正趋光性引起幼虫壁行为，导致颌畸形，而低亮度的水箱壁控制着这一过程。

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Positive phototaxis as the cause of jaw malformations in larval greater amberjack, Seriola dumerili (Risso, 1810): Mitigation by rearing in tanks with low-brightness walls

Jaw malformations are a serious problem in fingerlings of the greater amberjack, Seriola dumerili. To establish a countermeasure against these malformations, we conducted a larval behavioural test to identify their root cause, and we investigated the ability of low‐brightness rearing tank walls to control their occurrence. Larval distribution was examined in a horizontally illuminated rectangular transparent aquarium (20 cm × 100 cm × 25 cm), and their distribution was biased towards the light source after this lighting was provided from 3 to 13 days post hatching (dph), indicating positive phototaxis; this response disappeared on 22 dph (there are no data between 13 and 22 dph). Larvae were observed to swim phototactically towards the light source and repeatedly collided with the tank wall (walling behaviour). To investigate the ability of wall brightness to control the incidence of jaw malformations, we compared their incidence in a rearing trial with different Munsell colour values for the tank walls: 2.11 (black), 5.85 (grey) and 9.52 (white). The incidence rate of jaw malformations at 25 dph was significantly lower in the tanks with lower‐brightness walls, that is, 5.8%, 22.5% and 26.8% for black, grey and white respectively. Larval walling behaviour was most intense for white, followed in order by grey and black. These results indicate that positive phototaxis elicits larval walling behaviour, causing jaw malformations, and that low‐brightness tank walls control this process.

更新日期：2020-03-25

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