文章基本信息

标题：Application of polychaetes in (de)coupled integrated aquaculture: an approach for fish waste bioremediation
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作者：Marit A. J. Nederlof ; Jinghui Fang ; Thomas G. Dahlgren 等
期刊名称：Aquaculture Environment Interactions
印刷版ISSN：1869-215X
电子版ISSN：1869-7534
出版年度：2020
卷号：12
页码：385-399
DOI：10.3354/aei00371
出版社：Inter-Research
摘要：Development of benthic components within integrated multi-trophic aquaculture (IMTA) systems warrants more attention, and the development of polychaetes as an extractive component in IMTA systems is ongoing. This study estimates the bioremediation potential of Capitella sp. and Ophryotrocha craigsmithi for coupled and decoupled salmon-driven IMTA. In coupled IMTA, polychaetes receive fresh faeces, while in decoupled IMTA, preservation of faeces is applied. Respiration and ammonia excretion rates were measured for polychaetes fed fresh, oven-dried or acidified salmon faeces, and combined with nutrients incorporated into tissue growth, to estimate nutrient requirements. Nutrient requirements were subsequently used to evaluate bioremediation potential. Metabolic rates were highest for O. craigsmithi and contributed notably to their overall nutrient requirement (20-30%). For the 2 polychaete species, nutrient requirements ranged from 5 to 26 mg C and from 2 to 6 mg N g -1 AFDW d -1 . These requirements were comparable with or higher than other polychaete species, highlighting the potential for fish waste bioremediation by Capitella sp. and O. craigsmithi . Preserved diets reduced bioremediation potential 1.5 and 3-5 times for, respectively, Capitella sp. and O. craigsmithi . Assuming that polychaetes are efficient fish-faeces convertors, the bioremediation potential indicates that benthic cultivation units containing 65000-95000 ind. m -2 of Capitella sp. or 36000-194000 ind. m -2 of O. craigsmithi can convert the daily organic waste flux deposited below an average salmon farm. These densities were within ranges reported for wild populations, indicating that, based on the bioremediation potential, development of benthic IMTA with these 2 polychaete species seems realistic and efficient for waste conversion.
关键词：Metabolic processes ; Ophryotrocha craigsmithi ; Capitella sp;; Benthic IMTA ; Integrated multi-trophic aquaculture ; Deposit feeders ; Sustainability