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The balancing act: Protein, lipid and seaweed dietary levels to maximize gonad quantity in a wild-caught sea urchin
Aquaculture Nutrition ( IF 3.5 ) Pub Date : 2021-02-21 , DOI: 10.1111/anu.13243
Fletcher Warren‐Myers 1, 2 , Giovanni Turchini 3 , Stephen E. Swearer 2 , David Francis 3 , Tim Dempster 1
Affiliation  

Sea urchin gonads (roe) are a prized global sea food commodity, with growing demand driving the need for urchin roe enhancement aquaculture. Effective roe enhancement of urchins using formulated feeds require species-specific optimization and an understanding of the interactions between key dietary components (e.g. protein, lipid, carbohydrate, energy and/or algal supplements). Here, we tested 18 formulated feeds on the sea urchin Heliocidaris erythrogramma, collected from barrens. The 18 iso-energetic (~20 MJ/kg) feed combinations contained one of three protein levels (250, 375 or 500 g/kg), three lipid levels (73, 101 or 131 g/kg) combined with a single (45 g/kg Sargassum spp.) or multiple (45 g/kg Sargassum spp., 25 g/kg Solieria robusta, 25 g/kg Ulva lactuca) dried algal supplement. From two consecutive 12-week enhancement trials, the most optimal feed type contained 375 g/kg protein, 73 g/kg lipid and a 45 g/kg algal supplement (Sargassum spp.) and produced gonad indices of 18.5 ± 0.4% (Trial 1) and 21.7 ± 1.2% (Trial 2). Across feed types, there was no significant difference in the proportion of marketable quality (A and B grade) roe produced (56%–85% Trial 1, 65%–85% Trial 2). We conclude that roe enhancement of H. erythrogramma collected from barrens is highly feasible.

中文翻译:

平衡行为:蛋白质、脂质和海藻的饮食水平使野生海胆的性腺数量最大化

海胆性腺(鱼子)是一种珍贵的全球海鲜商品,不断增长的需求推动了对海胆鱼子增强水产养殖的需求。使用配方饲料对海胆进行有效的鱼卵增强需要针对特定​​物种进行优化,并了解关键膳食成分(例如蛋白质、脂质、碳水化合物、能量和/或藻类补充剂)之间的相互作用。在这里,我们在从贫瘠之地收集的海胆Heliocidaris erythrogramma上测试了 18 种配方饲料。18 种等能 (~20 MJ/kg) 饲料组合包含三种蛋白质水平(250、375 或 500 g/kg)、三种脂质水平(73、101 或 131 g/kg)中的一种,以及一种(45 g/kg Sargassum spp.) 或多种(45 g/kg Sargassum spp., 25 g/kg Solieriarobusta, 25 g/kg Ulva lactuca ) 干藻补充剂。从连续两次为期 12 周的增强试验中,最佳饲料类型包含 375 g/kg 蛋白质、73 g/kg 脂质和 45 g/kg 藻类补充剂(马尾藻属),产生的性腺指数为 18.5 ± 0.4%(试验) 1) 和 21.7 ± 1.2%(试验 2)。在不同的饲料类型中,生产的适销品质(A 级和 B 级)鱼子的比例没有显着差异(试验 1 为 56%–85%,试验 2 为 65%–85%)。我们得出结论,对从贫瘠地区收集的H. erythrogramma 的鱼子增强是非常可行的。
更新日期:2021-02-21
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