Blue mussels (Mytilus edulis) are boreo-temperate, filter-feeding bivalves common to intertidal areas. As filter-feeders they have been employed in open-water, multi-tropic aquaculture systems to reduce organic benthic loading though the exploitation of suspended particulate organic materials. We compared δ¹³C and δ¹⁵N signatures and the isotopic niches of mussels growing in, and adjacent to, an integrated multi-trophic aquaculture (IMTA) farm in British Columbia, Canada, and using this information evaluated the contribution of aquaculture-derived effluent to their diet. Farm-sampled mussels had the least intraspecific isotopic variation compared to mussels sampled at the reference site. The interaction between time (i.e. sampling dates) and site did not significantly affect the isotopic composition of mussels; however significant variation was detected in δ¹⁵N values as a function of sampling date and particulate organic matter. A two-source isotopic mixing model indicated that marine particulate organic matter and IMTA farm effluent were approximately equal in importance (~ 46 % and ~ 54 %, respectively) to the diet of IMTA-retrieved mussels. Uptake of IMTA farm waste by M. edulis supports their use as economic extractives while also mitigating farmed sablefish (Anoplopoma fimbria) nutrient loading to the aquatic environment.

Item Type:	Refereed Article
Keywords:	Mytilus edulis, integrated multi-trophic aquaculture, isotopic niche width, filter feeders, spatial subsidies
Research Division:	Environmental Sciences
Research Group:	Environmental Science and Management
Research Field:	Environmental Impact Assessment
Objective Division:	Animal Production and Animal Primary Products
Objective Group:	Fisheries - Aquaculture
Objective Field:	Aquaculture Molluscs (excl. Oysters)
UTAS Author:	Weldrick, CK (Ms Christine Weldrick)
ID Code:	114648
Year Published:	2016
Web of Science® Times Cited:	5
Deposited By:	Ecology and Biodiversity
Deposited On:	2017-02-22
Last Modified:	2017-05-01
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