PDF(Pubmed)
Abstract：
The rapid increase in aquaculture over the last several decades has led to concerns about the environmental impact of fish feeds relying on marine resources for fishmeal (FM). We aim to assess Nannochloropsis sp. QH25 co-product as a viable and sustainable replacement for FM in juvenile rainbow trout, Oncorhynchus mykiss, feeds. We formulated four experimental diets: a reference (FM based), 33N, 66N, and 100N diet (33%, 66%, and 100% co-product replacement). Rainbow trout were randomly assigned to one of 16 tanks and randomly assigned an experimental diet to consume throughout the experiment (64 days total), with four replicate tanks per diet. We compared the phosphorus (P) and nitrogen (N) digestibility, emissions, and growth between diets and, compared six environmental impacts (biotic resource use (BRU), global warming potential (GWP), water use, land use, marine eutrophication potential (MEP), and freshwater eutrophication potential (FEP)) of each diet. Our results indicate that replacing FM with co-product did not significantly alter growth. P digestibility of the experimental and reference diets was comparable. BRU conversion ratio was significantly lower in the experimental diets. However, there were significantly higher water and land use conversion ratios but insignificantly higher results in GWP, MEP, and FEP between the reference and 100N diet.
摘要：
在过去的几十年中，水产养殖的快速增长引起了人们对依赖海洋资源作为鱼粉（FM）的鱼饲料对环境的影响的担忧。我们的目标是评估微绿藻。QH25联合产品作为幼年虹鳟鱼FM的可行和可持续替代品，Oncorhynchusmykiss，饲料。我们制定了四种实验饮食：参考(基于FM)，33N,66N,和100N饮食(33%，66%,和100%的副产品替代)。虹鳟鱼被随机分配到16个坦克中的一个，并在整个实验中随机分配实验饮食（总共64天），每个饮食有四个重复的坦克。我们比较了磷（P）和氮（N）的消化率，排放,和饮食之间的增长，比较了六种环境影响(生物资源利用(BRU)，全球变暖潜势(GWP)用水,土地利用,海洋富营养化潜力(MEP)，和淡水富营养化潜力（FEP））。我们的结果表明，用副产物代替FM并没有显着改变生长。实验饮食和参考饮食的P消化率是相当的。BRU转化率在实验日粮中显著较低。然而,水和土地利用转化率明显较高，但GWP的结果不明显较高，MEP,和FEP之间的参考和100N饮食。
