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Evaluating chlorophyll depletion in mitigation mussel cultivation at multiple scales

Journal article
Authors J. K. Petersen
Lars-Ove Loo
D. Taylor
Published in Aquaculture Environment Interactions
Volume 11
Pages 263-278
ISSN 1869-215X
Publication year 2019
Published at The Sven Lovén Centre for Marine Sciences
Pages 263-278
Language en
Links dx.doi.org/10.3354/aei00312
Keywords Mussel cultivation, Eutrophication, Mitigation, Mytilus edulis, Chlorophyll depletion, mytilus-edulis, benguela system, raft culture, shellfish mariculture, phytoplankton biomass, stocking density, clearance rate, carbon budget, saldanha bay, water-flow, Fisheries, Marine & Freshwater Biology, d jk, 1995, geographical analysis, v27, p286
Subject categories Marine ecology

Abstract

Implementation of mussel culture for mitigating nutrient enrichment of coastal waters aims to optimize growth of mussels at production carrying capacity for maximum nutrient extraction. Simplified approaches for describing reductions in chlorophyll concentrations for the strategic deployment of mitigation units with regards to limited space and biophysical conditions can facilitate the proliferation of mitigation culture as a tool. Here we report data on measured chl a depletion at different scales in and around a mussel culture unit in western Sweden. A monitoring program was set up for a production period of 15 mo to characterize patterns of chl a depletion. The water column was almost permanently stratified, and concentrations of chl a were higher outside of the culture unit and autocorrelated within the unit by vertical and horizontal dimensions. Depletion of chl a within the culture unit during a focused sampling campaign period was negatively correlated with current velocity, greatest in the center of the unit (ca. 60% of ambient chl a concentrations) and lowest at the unit borders. Depletion was observed at the micro-scale within the boundary layer around the mussel aggregates, corresponding to a depletion gradient from the mussel aggregate surface of 0.074 mu g l(-1) cm(-1). Shell length increment ranged between 0.04 and 0.29 mm d(-1) and specific growth rate ranged between 0 and 4.6% of dry weight d(-1). A simple model was applied to evaluate scenarios of alternate farm configurations and fit to measured depletion. Model runs showed that the angle of incoming flow is important in a low-current regime (i.e. <10 cm s(-1)), and orientating the culture unit in line with predominant current directions would allow for enhanced reduction of chl a.

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