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首页> 外文期刊>Aquaculture Research >Physical and biochemical properties of effluent leaving an onshore Atlantic cod (Gadus morhua, Linnaeus 1758; Gadiformes: Gadidae) aquaculture facility and potential use in integrated multi-trophic aquaculture
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Physical and biochemical properties of effluent leaving an onshore Atlantic cod (Gadus morhua, Linnaeus 1758; Gadiformes: Gadidae) aquaculture facility and potential use in integrated multi-trophic aquaculture

机译：离开岸上大西洋鳕鱼（加德斯·莫尔瓦（Gadus morhua），林奈（Linnaeus）1758;加迪福斯（Gadiformes：Gadidae））水产养殖设施的废水的物理和生化特性及其在综合多营养水产养殖中的潜在用途

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The physical and biochemical properties of Atlantic cod (Gadus morhua) wastes were analysed, and the waste remediation potential of blue mussels (Mytilus edulis) was assessed. Waste generated daily by Atlantic cod represented 24.9% of the cod feed added to the system. Particle distributions determined using a Coulter Multisizer and image analysis revealed that the majority of the particles in terms of numbers occupy the smaller size ranges; however, larger particles occupy a larger proportion of the volume. Effluent was composed of particles <70m (36%), 70-500m (31%) and particles >500m (33%) by weight. The amount of dissolved carbon and nitrogen associated with the effluent represented 3.1% and 3.7%, respectively, of the total feed added to the system daily. Particles <70m had significantly less organic matter, lipids and fatty acids and were expected to be ingested more by mussels than larger particles. The major lipid classes present in effluent were free fatty acids, triacylglycerols, phospholipids, acetone mobile polar lipids and sterol. Cod effluent contained two essential fatty acids DHA and EPA, a diatom marker (16:17), as well as two zooplankton markers 22:111 and 20:19, which accumulated in mussels and may serve as markers for aquaculture wastes. Although only 36% of the effluent was of a size suitable for mussel ingestion, this size fraction has the greatest potential to spread to surrounding areas. These particulates may be useful as an alternate food source when natural seston is low.
机译：分析了大西洋鳕鱼（Gadus morhua）废物的物理和生化特性，并评估了蓝贻贝（Mytilus edulis）的废物修复潜力。大西洋鳕鱼每天产生的废物占添加到系统中的鳕鱼饲料的24.9％。使用Coulter Multisizer和图像分析确定的颗粒分布表明，大多数颗粒在数量上占据较小的尺寸范围;然而，较大的颗粒占据较大的体积比例。出水由重量小于70m（36％），70-500m（31％）的颗粒和大于500m（33％）的颗粒组成。与废水相关的溶解碳和氮的量分别占每天添加到系统中的总进料的3.1％和3.7％。小于70m的颗粒中有机物，脂质和脂肪酸的含量明显减少，贻贝比大颗粒的摄入量更多。废水中存在的主要脂质类别为游离脂肪酸，三酰基甘油，磷脂，丙酮可移动极性脂质和固醇。鳕鱼废水中含有两种必需脂肪酸DHA和EPA，一种硅藻标记物（16:17），以及两种浮游动物标记物22：111和20:19，它们积聚在贻贝中，可作为水产养殖废物的标记物。尽管只有36％的废水具有适合贻贝摄食的尺寸，但该尺寸部分具有最大的扩散到周围地区的潜力。当自然色氨酸含量低时，这些微粒可用作替代食物来源。

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