Growth and Oxidative Stress of Clownfish Amphiprion ocellaris Reared at Different Salinities

IF 2.1 3区 农林科学 Q2 FISHERIES Fishes Pub Date : 2024-01-10 DOI:10.3390/fishes9010030
Mario Davi Dias Carneiro, R. S. Medeiros, José María Monserrat, R. Rodrigues, Luís A Sampaio
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Abstract

Aquaculture of ornamental marine fish is often conducted in recirculating aquaculture systems (RAS) using artificial seawater. Considering the cost of salts to produce artificial seawater (salinity 35‰), we investigated the effect of different salinities (5, 15, 25, and 35‰) on survival, growth, and oxidative stress responses of juvenile clownfish Amphiprion ocellaris. All fish died when reared at salinity 5‰, but at all other salinities survival was ≥95% in the other treatment groups. There was no influence of salinity on growth and oxidative stress responses of clownfish reared at salinities 15, 25, and 35‰, except for the activity of glutathione S-transferase (GST) of fish reared at 25‰, which was significantly lower compared to those reared in salinity 35‰. The salinity of home aquariums is usually 35‰, so even though clownfish can be reared in brackish water, they need to be transferred to full strength seawater (35‰) in order to be commercialized. Therefore, we also evaluated the responses of acute transference of fish reared at 15 to salinity 35‰. There were no mortalities associated with acute salinity transference and no oxidative damage was observed either. The total capacity against peroxyl radicals (ACAP) was immediately increased after fish were placed in salinity 35‰, and remained high after 168 h (7 days), helping fish to deal with oxidative threats. In conclusion, it is possible to rear juvenile clownfish at 15‰ without harming growth or inducing oxidative stress, possibly reducing costs of water salinization. They can be transferred from brackish water to salinity 35‰ immediately before going to the retail market, with no mortality or oxidative damage.
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不同盐度下饲养的小丑鱼的生长和氧化应激
观赏海水鱼的养殖通常在使用人工海水的循环水养殖系统(RAS)中进行。考虑到生产人工海水(盐度 35‰)的盐成本,我们研究了不同盐度(5、15、25 和 35‰)对小丑鱼幼鱼存活、生长和氧化应激反应的影响。在盐度为 5‰的环境中饲养的小丑鱼全部死亡,但在所有其他盐度条件下,其他处理组的存活率均≥95%。盐度对小丑鱼在 15、25 和 35‰盐度下的生长和氧化应激反应没有影响,但 25‰盐度下饲养的小丑鱼的谷胱甘肽 S-转移酶(GST)活性明显低于 35‰盐度下饲养的小丑鱼。家庭水族箱的盐度通常为 35‰,因此,即使小丑鱼可以在咸水中饲养,也需要转移到全浓度海水(35‰)中才能商业化。因此,我们还评估了在 15 盐度下饲养的鱼类急性转移到 35 盐度下的反应。急性盐度转移没有造成死亡,也没有观察到氧化损伤。将鱼放入盐度为 35‰的环境中后,抗过氧自由基的总能力(ACAP)立即增加,168 小时(7 天)后仍保持较高水平,有助于鱼类应对氧化威胁。总之,在 15‰的盐度下饲养小丑鱼幼鱼不会损害其生长或诱发氧化应激,从而可能降低水体盐化的成本。它们可以在进入零售市场前立即从咸水转移到盐度为 35‰的水域,而且不会出现死亡或氧化损伤。
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来源期刊
Fishes
Fishes Multiple-
CiteScore
1.90
自引率
8.70%
发文量
311
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