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Lipid and protein utilisation during early development of yellowtail kingfish (Seriola lalandi)

机译：黄尾king（Seriola lalandi）早期发育过程中的脂质和蛋白质利用

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The pelagic yellowtail kingfish Seriola lalandi has become a target species for aquaculture in Asia and Australasia. Australasian production is reliant on larvicul-ture from eggs of captive brood stock; however, knowledge regarding the nutritional requirements of larvae of this species is still scarce, particularly in relation to lipids. As a first step in establishing these requirements, eggs and larvae from captive S. lalandi brood stock were examined for differences in total protein, total lipid and lipid classes between individual spawning events, over the spawning season, and during larval development from fertilisation to 15 days post hatch. Results indicate that total protein egg"1 varied significantly between individual spawning events within a season, but neither total lipid nor total protein egg~(-1) varied significantly across the spawning season. Brood stock egg lipids were made up of approximately 60% phospholipid, 25% wax and/or sterol esters (WE), 15% triacylglycerol (TAG), and small amounts of sterols and free fatty acids. During the early larval period, both WE and TAG were utilised concurrently for energy. The larvae experienced very high mortality around 5-7 days post hatch, which coincided with very low levels of all neutral lipid classes. Although many other factors may also influence larval mortality, these results indicate that lipid provisioning may be an important factor in larval survival during the critical period around first-feeding in this species. Examination of ratios of TAG:ST, often used as a condition index in fish larvae, suggested that some of the larvae were suffering from starvation. However, as egg-derived WE appears to provide a significant source of energy during the early larval period in S. lalandi, it is suggested that WE should be included in any index of larval nutritional state.
机译：上层黄尾金鱼Seriola lalandi已成为亚洲和大洋洲水产养殖的目标物种。澳大利亚的生产依赖于圈养亲鱼卵的幼虫。然而，关于该物种幼虫营养需求的知识仍然匮乏，特别是在脂质方面。作为建立这些要求的第一步，检查了圈养的南美白对虾种群卵和幼虫在各个产卵期之间，产卵季节以及从受精到15的幼虫发育过程中总蛋白质，总脂质和脂质类别的差异。孵化后的天数。结果表明，一个季节内各个产卵事件之间的总蛋白卵“ 1”变化显着，但整个产卵季节总脂质或总蛋白卵〜（-1）均无显着变化。亲鱼卵的脂质由大约60％的磷脂组成，25％的蜡和/或固醇酯（WE），15％的三酰甘油（TAG）以及少量的固醇和游离脂肪酸，在幼虫早期，WE和TAG都被同时利用以获取能量。孵化后约5-7天的死亡率很高，这与所有中性脂质类别的水平都很低虽然许多其他因素也可能影响幼虫死亡率，但这些结果表明脂质供应可能是关键时期幼虫存活的重要因素TAG-ST的比例（通常用作鱼幼虫的状况指标）的检查表明，某些幼虫正遭受饥饿。 r，由于在拉兰迪幼鱼早期，鸡蛋来源的WE似乎提供了重要的能量来源，因此建议将WE包括在任何幼虫营养状态指标中。

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