Prevention of hypermelanosis by rearing Japanese flounder Paralichthys olivaceus in net-lined tanks
Prevention of hypermelanosis by rearing Japanese flounder Paralichthys olivaceus in net-lined tanks
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DOI：
10.1007/s12562-019-01369-1
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发表时间：
2019-10
影响因子：
1.9
通讯作者：
K. Mizutani;Toshiyuki Yamada;Keita W. Suzuki;R. Masuda;Kuniaki Nakata;M. Tagawa
中科院分区：
文献类型：
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作者：
K. Mizutani;Toshiyuki Yamada;Keita W. Suzuki;R. Masuda;Kuniaki Nakata;M. Tagawa
在人工养殖的比目鱼中，特别是牙鲆，在正常变态后，经常会在鱼的盲侧出现色素皮肤(黑色素沉着症)。由于还没有提出实用的预防方法，我们检查了放置在养殖箱内的松散网的有效性，该网像袋子一样覆盖底部和墙壁。当幼鱼(标准长度[SL]6厘米)在第一次出现黑色素沉着之前被转移到网衬鱼缸(网目尺寸4毫米)时，2个半月后的色素区域覆盖了大约0.5%的盲侧；这大约是普通鱼缸中饲养的鱼被色素覆盖面积的四分之一(20%)。虽然腋窝区域(被胸鳍覆盖的区域)最初出现的色素沉着没有被抑制，但使用更大的网目尺寸(12 Mm)减少了该区域色素沉着的扩大。网箱饲养的幼鱼比普通水箱饲养的幼鱼小5~15%，但体深与体深的比值更接近于野外捕获的幼鱼。根据这项研究的结果，我们认为网状养殖池是预防牙鲆养殖系统中黑色素沉着的一种实用方法。
In artificially reared flatfish, especially the Japanese flounderParalichthys olivaceus, pigmented skin (hypermelanosis) frequently appears on the fish’s blind side after normal metamorphosis. As no practical prevention method has yet been proposed, we examined the effectiveness of a loose net placed inside the rearing tank that covers the bottom and walls like a pouch. When juveniles (standard length [SL] 6 cm) were transferred to the net-lined tank (mesh size 4 mm) before the first appearance of hypermelanosis, the pigmented area after 2 months covered about 0.5% of the blind side; this is about 1/40th of the area covered by pigment in fish reared in an ordinary tank (20%). Although the initial appearance of pigmentation in the axilla area (the area covered by the pectoral fin) was not suppressed, utilization of a larger mesh size (12 mm) decreased the expansion of pigmentation in this area. Juveniles reared in the net-lined tank were about 5–15% smaller (SL) than those reared in the ordinary tank, but their body depth:SL ratio was closer to that of wild-caught juveniles. From the results of this study, we propose that net-lined rearing tanks with larger-sized mesh are a practical method of preventing hypermelanosis in Japanese flounder aquaculture systems.