Capitella sp. and Ophryotrocha craigsmithi received a diet of salmon feces to evaluatetheir potential to convert fish waste into valuable marine products, e.g. ingredients for fishfeed formulation. Production rate and body composition (focusing on fatty acid [FA] profiles)were determined for polychaetes fed fresh, acid-preserved or oven-dried salmon feces to evaluatetheir application in (de)coupled integrated multi-trophic aquaculture (IMTA) systems. Coupledproduction refers to direct integration of fish and polychaetes within the same (eco)system,while in decoupled production, units can be spatially or functionally separated. For decoupledproduction, preservation of fish waste is recommended. Although diets contained relatively lowpolyunsaturated FA (PUFA) levels (5−9% of total FAs), both species were rich in PUFAs (>30%of total FAs) and contained the essential FAs for fish. Feeding Capitella sp. the acid-preserveddiet enriched its FA profile. Accumulation of PUFAs, de novo synthesis and/or transfer via bacterialbiomass could have played a role in the upregulation of PUFA content. Amino acid profilesindicated that these polychaetes contained the amino acids essential for fish. Highest growth forboth species was observed when fed fresh feces, whereas preserved diets resulted in negativegrowth rates for O. craigsmithi, suggesting an important role of microbes in polychaete diets.Our results indicate that both species are potential valuable marine products. Given growth rateswith different diets, O. craigsmithi seems more suitable for integration in coupled systems, whileCapitella sp. is interesting for both coupled and decoupled integrated systems

中文翻译：

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多毛类在（去）耦合综合水产养殖中的应用：生产优质海洋资源

Capitella sp. 和 Ophryotrocha craigsmithi 接受了鲑鱼粪便的饮食，以评估它们将鱼类废物转化为有价值的海洋产品的潜力，例如鱼饲料配方的成分。测定了喂食新鲜、酸保存或烘干的鲑鱼粪便的多毛类动物的生产率和身体成分（重点是脂肪酸 [FA] 谱），以评估它们在（去）耦合综合多营养水产养殖 (IMTA) 系统中的应用。耦合生产是指鱼类和多毛类在同一（生态）系统内的直接整合，而在分离生产中，单元可以在空间或功能上分开。对于脱钩生产，建议保存鱼类废物。尽管饮食中多不饱和脂肪酸 (PUFA) 含量相对较低（占总脂肪酸的 5-9%），但两种物种都富含 PUFA（> FAs 总量的 30%）并含有鱼类必需的 FAs。喂养 Capitella sp. 酸保存饮食丰富了它的 FA 谱。PUFA 的积累、从头合成和/或通过细菌生物质的转移可能在 PUFA 含量的上调中发挥了作用。氨基酸谱表明这些多毛类动物含有鱼类必需的氨基酸。当喂食新鲜粪便时，两种物种的生长速度最高，而保存饮食导致 O. craigsmithi 的负生长率，表明微生物在多毛类饮食中的重要作用。我们的结果表明，这两种物种都是潜在的有价值的海产品。考虑到不同饮食的增长率，O. craigsmithi 似乎更适合集成在耦合系统中，而 Capitella sp。对耦合和解耦集成系统都很有趣