Dietary arachidonic acid and the impact on growth performance, health and tissues fatty acids in Malabar red snapper (Lutjanus malabaricus) fingerlings
Dietary arachidonic acid and the impact on growth performance, health and tissues fatty acids in Malabar red snapper (Lutjanus malabaricus) fingerlings
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DOI：
10.1016/j.aquaculture.2019.734757
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发表时间：
2020-03-30
期刊：
影响因子：
4.5
通讯作者：
Ng, Wing-Keong
中科院分区：
文献类型：
--
作者：
Chee, Wei-Ling;Turchini, Giovanni M.;Ng, Wing-Keong
研究了饲料中花生四烯酸(ARA，20：4N-6)对马拉巴红鱼(Lutjanus Marabaricus)鱼种生长、免疫应答和脂肪酸组成的影响。试验设计了4种等氮、等脂和等能试验日粮，其中ARA含量分别为0.05%、0.26%、0.47%和0.65%。三组鱼种(平均体重5.9克)在六周内每天喂食两次，直到鱼的初始体重增加两倍。饲料处理对鱼的生长、饲料效率和存活率没有影响(P>；0.05)。根据测试的生理反应参数，鱼的健康状况得到了明显的改善，特别是鱼的超氧化物歧化酶活性与饲料中ARA含量之间存在线性正相关。投喂不同饲料的鱼肝、鳃和肌肉的总脂含量没有差异，其脂肪酸组成反映了饲料的脂肪酸组成，但有一些显著差异。与四种饲料中EPA的饲料供应量无关，饲料中ARA水平的提高显著(P<；.05)降低了投喂鱼的肌肉和鳃脂肪中的EPA含量。目前的研究表明，饲料中添加一些ARA可以使马拉巴红鱼鱼种受益，但可能会出现一些组织中EPA保留量减少的权衡，需要进一步研究以确定ARA的最佳饲料包含水平。
The present study assessed the growth, immune response and fatty acid composition of Malabar red snapper (Lutjanus malabaricus) fingerlings, as affected by dietary arachidonic acid (ARA, 20:4n-6). Four isonitrogenous, isolipidic and isoenergetic experimental diets were formulated with graded inclusion levels of ARA, at 0.05, 0.26, 0.47 or 0.65% of total diet. Triplicate groups of fingerlings (mean weight 5.9 g) were fed to apparent satiation twice daily for six weeks, until fish tripled their initial body weight. Growth, feed efficiency and survival of fish was not affected (P > .05) by dietary treatments. Based on the tested physiological response parameters, an apparent general improvement in fish health was noted, and in particular a linear positive correlation was observed between superoxide dismutase activity of fish and dietary ARA content. No differences were found in the total lipid content of liver, gill and muscle of fish fed the different diets, and their fatty acid composition reflected that of the diets, but with some notable variations. Independent of the dietary supply of EPA across the four diets, the content of EPA was significantly (P < .05) reduced in muscle and gill lipid of fish fed increasing dietary ARA levels. The present study suggested that Malabar red snapper fingerlings could benefit by the inclusion of some dietary ARA, however a trade-off with reduced EPA retention in some tissues is likely to occur and further studies are warranted to determine optimal dietary inclusion level of ARA.