Details:

Journal Title:
Aquaculture
Personal Author:
Hamilton, Scott L. ; Elliott, Matthew S. ; deVries, Maya S. ; Adelaars, Jason ; Rintoul, Maxwell D. ; ... More +
Hamilton, Scott L. ; Elliott, Matthew S. ; deVries, Maya S. ; Adelaars, Jason ; Rintoul, Maxwell D. ; Graham, Michael H. Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research)
Description:
Integrated multi-trophic aquaculture (IMTA) has the potential to enhance growth, reduce nutrient loads, and mitigate environmental conditions compared to traditional single-species culture techniques. The goal of this project was to develop a land-based system for the integrated culture of seaweeds and shellfish, to test the efficacy of integrated versus non-integrated designs, and to assess the potential for IMTA to mitigate the effects of climate change from ocean acidification on shellfish growth and physiology. We utilized the red abalone (Haliotis rufescens) and the red seaweed dulse (Devaleraea mollis) as our study species and designed integrated tanks at three different recirculation rates (0%, 30%, and 65% recirculation per hour) to test how an integrated design would affect growth rates of the abalone and seaweeds, modify nutrient levels, and change water chemistry. We specifically hypothesized that IMTA designs would raise seawater pH to benefit calcifying species. Our results indicated that juvenile abalone grew significantly faster in weight (22% increase) and shell area (11% increase) in 6 months in tanks with the highest recirculation rates (65%). The 65% recirculation treatment also exhibited a significant increase in mean seawater pH (0.2 pH units higher) due to the biological activity of the seaweed in the connected tanks. We found a significant positive relationship between the mean pH of seawater in the tanks and juvenile abalone growth rates across all treatments. There were no significant differences in the growth of dulse among treatments, but dulse growth did vary seasonally. Seawater phosphate and nitrate concentrations were depleted in the highest recirculation rate treatment, but ammonium concentrations were elevated, likely due to the abalone effluent. Overall, our results indicate that there are benefits to IMTA culture of seaweeds and abalone in terms of improving growth in land-based systems, which will reduce the time to market and buffer commercial abalone operations against the effects of ocean acidification during vulnerable early life stages.
Keywords:
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Aquatic Science
Source:
Aquaculture, 560, 738571
DOI:
https://doi.org/10.1016/j.aquaculture.2022.738571
ISSN:
0044-8486
Format:
PDF
Publisher:
Elsevier BV
Document Type:
Journal Article
Funding:
Grant no. NA17OAR4170216 ; Grant no. NA18OAR4170073
Grant no. NA17OAR4170216 ; Grant no. NA18OAR4170073 Less -
License:
https://creativecommons.org/licenses/by-nc-nd/4.0/
Rights Information:
CC BY-NC-ND
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:2dcd253fd12339d38a4f7e46cb0f6714b578395d52c6c1e2b6b3828e3e255029
Download URL:
https://repository.library.noaa.gov/view/noaa/59546/noaa_59546_DS1.pdf
File Type:

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