Carbon supplementation promotes assimilation of aquaculture waste by the sea cucumber Holothuria scabra: Evidence from stable isotope analysis
Carbon supplementation promotes assimilation of aquaculture waste by the sea cucumber Holothuria scabra: Evidence from stable isotope analysis
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DOI：
10.1016/j.aquaculture.2021.737295
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发表时间：
2021-08
期刊：
影响因子：
4.5
通讯作者：
Paula Senff;Brendan Elba;A. Kunzmann;L. Gillis;G. Robinson
中科院分区：
文献类型：
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作者：
Paula Senff;Brendan Elba;A. Kunzmann;L. Gillis;G. Robinson
利用集约化水产养殖的固体废物培育海参等高价值沉积物喂食者，是将潜在的营养污染转化为资源的创新方法。碳补充以增加富氮水产养殖废物的碳/氮比(C：N)已被证明支持更高的沉积物饲喂生物量，但商业上可行的碳源仍有待测试。本实验研究了实验室级纤维素酶和蔗渣这一农业废弃物对紫背海参幼鱼生长和营养物质利用率的影响。添加蔗渣支持的最终生物量密度(205.71±11.08g/m−2，平均为10.08g/m Se)显著高于不添加碳的废物(p=0.027)。首次将物种特异性营养丰富因子(Δ13Corg)应用于H。结痂(Δ13Corgof2.56Cogof2.56Cogof2.56Cogof2.56Cogof2.560.96‰，平均4.31Corgof2.56±0.96‰)。结果表明，海参能够直接从纤维素中吸收碳。蔗渣支持从水产养殖废物中更高地吸收碳，从而确定它是通过在综合水产养殖中沉积物饲养海参来改善生物修复的一种可行资源。虽然说明了营养平衡对生物修复的重要性，但关于沉积物喂食者直接进食与微生物群落分解的作用仍存在疑问。
Cultivating high-value deposit feeders such as sea cucumbers on solid waste from intensive aquaculture is an innovative approach to turn potential nutrient pollution into a resource. Carbon supplementation to increase the carbon to nitrogen ratio (C:N) of the nitrogen-rich aquaculture waste has been demonstrated to support higher deposit feeder biomass, but commercially viable carbon sources remain to be tested. This experiment investigated the performance of laboratory grade cellulose and bagasse, an agricultural waste product, to improve growth and nutrient utilization from milkfish aquaculture waste in juveniles of the sea cucumberHolothuria scabra. Supplementation with bagasse supported a significantly higher final biomass density (205.71 ± 11.08 g m−2, mean ± SE) than waste without carbon supplementation (p= 0.027). For the first time, a species-specific trophic enrichment factor (Δ13Corg) was applied in stable isotope analysis of feed sources byH. scabra(Δ13Corgof 2.56 ± 0.96‰ (mean ± SD) for the internal organs and 4.31 ± 0.96‰ for the body wall). Results indicated that sea cucumbers were able to assimilate carbon directly from the cellulose. Bagasse supported higher uptake of carbon from aquaculture waste, thus identifying it as a viable resource to improve bioremediation by deposit feeding sea cucumbers in integrated aquaculture. While illustrating the importance of nutrient balances for bioremediation, questions remain about the roles of direct feeding by deposit feeders vs. the decomposition by microbial communities.