ABSTRACT: Organic enrichment from fish farming may impact benthic species and habitats in adjacent areas. Norwegian salmon farming is continuously growing, but, due to area conflicts and severe sea-lice problems in the western areas, growth of the industry is focused in the northern areas. Knowledge is scarce on how an increase in fish farming will impact Arctic and subarctic species and habitats. One such species is the Iceland scallop Chlamys islandica, distributed from the Lofoten Islands in Nordland County to the Varangerfjord in Troms and Finnmark County. To study the impact of fine-particle fish faeces on feeding and reproductive ability in adult Iceland scallop, particles <41 µm of finfish waste were added to the diet. Effects were tested via short-term (weeks) feeding studies using 2 diets, 100% cultured algal species and a 50% mix of algae and fish waste. In addition, a 100% fish waste diet was used to study longer-term effects on reproductive ability (months). Feeding (% particle clearance and feeding rate) on the microalgae diet tended to be higher than that on the diet containing fish waste, but the difference was significant only in 2 out of 4 cases. We did not find any effect of diets on reproductive ability (gonad development and fatty acid profiles) of scallops. Lack of knowledge on sufficient food levels for gonad maturation in this species may have affected the results. We suggest that future work includes the transplant of scallops from a reference site to fish production sites and that investigations begin immediately after spawning early in scallop gonad development.

中文翻译：

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在冰岛扇贝 Chlamys islandica 的饮食中添加鱼类废物：对摄食和繁殖能力的影响

摘要：养鱼业的有机物富集可能会影响邻近地区的底栖物种和栖息地。挪威鲑鱼养殖持续增长，但由于地区冲突和西部地区严重的海虱问题，该产业的增长集中在北部地区。关于鱼类养殖的增加将如何影响北极和亚北极物种和栖息地的知识很少。其中一个物种是冰岛扇贝Chlamys islandica，分布于诺尔兰郡的罗弗敦群岛至特罗姆斯和芬马克郡的瓦朗厄尔峡湾。为了研究细颗粒鱼粪便对成年冰岛扇贝摄食和繁殖能力的影响，在饮食中添加了 <41 µm 的有鳍鱼粪便颗粒。使用 2 种饮食、100% 培养的藻类和 50% 的藻类和鱼类废物混合，通过短期（数周）喂养研究测试了效果。此外，还使用 ​​100% 鱼类废弃物饮食来研究对生殖能力（月）的长期影响。微藻饮食的喂食（颗粒清除率和喂食率）往往高于含有鱼粪的饮食，但仅在 4 个案例中有 2 个差异显着。我们没有发现饮食对扇贝的繁殖能力（性腺发育和脂肪酸谱）有任何影响。缺乏关于该物种性腺成熟的足够食物水平的知识可能影响了结果。我们建议未来的工作包括将扇贝从参考地点移植到鱼类生产地点，并在扇贝性腺发育早期产卵后立即开始调查。