Details:

Journal Title:
Aquaculture Engineering
Personal Author:
Davidson, John ; Grimm, Casey ; Summerfelt, Steven ; Fischer, Gregory ; Good, Christopher
Davidson, John ; Grimm, Casey ; Summerfelt, Steven ; Fischer, Gregory ; Good, Christopher Less -
NOAA Program & Office:
Sea Grant ; OAR (Oceanic and Atmospheric Research)
Sea Grant ; OAR (Oceanic and Atmospheric Research) Less -
Sea Grant Program:
WISCU (Wisconsin Sea Grant)
Description:
Common off-flavor compounds including geosmin (GSM) bioaccumulate in fish cultured in recirculating aquaculture systems (RAS) resulting in unpalatable fillets that are objectional to consumers. Most RAS facilities relocate fish from grow-out tanks to separate depuration systems with increased water flushing to remediate pre-harvest off-flavors, but certain aspects of this procedure have not been optimized including characterization of water exchange rates that effectively diminish off-flavor. To this end, a study was carried out to evaluate the effects of flushing rate and associated depuration system hydraulic retention time (HRT) on GSM removal from Atlantic salmon Salmo salar originally produced in a semi-commercial scale freshwater RAS. Twenty-six fish (5−7 kg each) were stocked into twelve replicate depuration systems operated with system HRTs of 2.4, 4.6, and 11.3-h, respectively (N = 4). Geosmin was assessed at intervals in system water and fish flesh over a 10-day feed withholding period. Waterborne GSM concentration was affected by flushing rate and associated system HRT (P <  0.05). Depuration systems operated with an 11.3-h HRT had greater waterborne GSM levels at 3, 6, and 10 days post-stocking compared to 2.4 and 4.6-h HRT. A similar trend was generally reflected in salmon flesh. Residual GSM levels were successively higher in fillets on Day 6 from depuration systems with increasingly longer HRT. Geosmin levels were greatest in salmon flesh from the 11.3-h HRT treatment on Day 10, but fillet GSM between the 2.4 and 4.6-h HRT was similar. This research indicates that lowest residual GSM is achieved in water and Atlantic salmon flesh in depuration systems with increased flushing and shorter HRT, i.e., 2.4–4.6-h under conditions of this study. Selection of optimal flushing rate to remediate off-flavor from RAS-produced Atlantic salmon may also be dictated by water and energy use metrics and site-specific water availability among other factors.
Keywords:
[+]
Aquaculture Atlantic Salmon
Source:
Aquaculture Engineering 90: 102104, 2020
DOI:
https://doi.org/10.1016/j.aquaeng.2020.102104
Sea Grant Document Number:
WISCU-R-20-005
Document Type:
Journal Article
Funding:
Grant no. NA18OAR4170097 ; Grant no. NA18OAR4170336
Grant no. NA18OAR4170097 ; Grant no. NA18OAR4170336 Less -
Rights Information:
CC BY
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:2c69bc601b1d7e05fe8e1d1c38b3d655f8f15f78927a285f3ca09b211504801b
Download URL:
https://repository.library.noaa.gov/view/noaa/37515/noaa_37515_DS1.pdf
File Type:

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