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Observations on Side-Swimming Rainbow Trout in Water Recirculation Aquaculture Systems

During a controlled 6-month study using six replicated water recirculation aquaculture systems (WRASs), it was observed that Rainbow Trout Oncorhynchus mykiss in all WRASs exhibited a higher-than-normal prevalence of side swimming (i.e., controlled, forward swimming but with misaligned orientation s...

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Autores principales: Good, Christopher, Davidson, John, Kinman, Christin, Kenney, P. Brett, Bæverfjord, Grete, Summerfelt, Steven
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Taylor & Francis 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4270422/
https://www.ncbi.nlm.nih.gov/pubmed/25250476
http://dx.doi.org/10.1080/08997659.2014.938870
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author Good, Christopher
Davidson, John
Kinman, Christin
Kenney, P. Brett
Bæverfjord, Grete
Summerfelt, Steven
author_facet Good, Christopher
Davidson, John
Kinman, Christin
Kenney, P. Brett
Bæverfjord, Grete
Summerfelt, Steven
author_sort Good, Christopher
collection PubMed
description During a controlled 6-month study using six replicated water recirculation aquaculture systems (WRASs), it was observed that Rainbow Trout Oncorhynchus mykiss in all WRASs exhibited a higher-than-normal prevalence of side swimming (i.e., controlled, forward swimming but with misaligned orientation such that the fish's sagittal axis is approximately parallel to the horizontal plane). To further our understanding of this abnormality, a substudy was conducted wherein side swimmers and normally swimming fish were selectively sampled from each WRAS and growth performance (length, weight), processing attributes (fillet yield, visceral index, ventrum [i.e., thickness of the ventral “belly flap”] index), blood gas and chemistry parameters, and swim bladder morphology and positioning were compared. Side swimmers were found to be significantly smaller in length and weight and had less fillet yield but higher ventrum indices. Whole-blood analyses demonstrated that, among other things, side swimmers had significantly lower whole-blood pH and higher Pco (2). Side swimmers typically exhibited swim bladder malformations, although the positive predictive value of this subjective assessment was only 73%. Overall, this study found several anatomical and physiological differences between side-swimming and normally swimming Rainbow Trout. Given the reduced weight and fillet yield of market-age side swimmers, producers would benefit from additional research to reduce side-swimming prevalence in their fish stocks. Received March 20, 2014; accepted May 20, 2014
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spelling pubmed-42704222014-12-24 Observations on Side-Swimming Rainbow Trout in Water Recirculation Aquaculture Systems Good, Christopher Davidson, John Kinman, Christin Kenney, P. Brett Bæverfjord, Grete Summerfelt, Steven J Aquat Anim Health Communication During a controlled 6-month study using six replicated water recirculation aquaculture systems (WRASs), it was observed that Rainbow Trout Oncorhynchus mykiss in all WRASs exhibited a higher-than-normal prevalence of side swimming (i.e., controlled, forward swimming but with misaligned orientation such that the fish's sagittal axis is approximately parallel to the horizontal plane). To further our understanding of this abnormality, a substudy was conducted wherein side swimmers and normally swimming fish were selectively sampled from each WRAS and growth performance (length, weight), processing attributes (fillet yield, visceral index, ventrum [i.e., thickness of the ventral “belly flap”] index), blood gas and chemistry parameters, and swim bladder morphology and positioning were compared. Side swimmers were found to be significantly smaller in length and weight and had less fillet yield but higher ventrum indices. Whole-blood analyses demonstrated that, among other things, side swimmers had significantly lower whole-blood pH and higher Pco (2). Side swimmers typically exhibited swim bladder malformations, although the positive predictive value of this subjective assessment was only 73%. Overall, this study found several anatomical and physiological differences between side-swimming and normally swimming Rainbow Trout. Given the reduced weight and fillet yield of market-age side swimmers, producers would benefit from additional research to reduce side-swimming prevalence in their fish stocks. Received March 20, 2014; accepted May 20, 2014 Taylor & Francis 2014-10-02 2014-09-17 /pmc/articles/PMC4270422/ /pubmed/25250476 http://dx.doi.org/10.1080/08997659.2014.938870 Text en © 2014 The Author(s). American Fisheries Society http://creativecommons.org/licenses/by/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The moral rights of the named author(s) have been asserted.
spellingShingle Communication
Good, Christopher
Davidson, John
Kinman, Christin
Kenney, P. Brett
Bæverfjord, Grete
Summerfelt, Steven
Observations on Side-Swimming Rainbow Trout in Water Recirculation Aquaculture Systems
title Observations on Side-Swimming Rainbow Trout in Water Recirculation Aquaculture Systems
title_full Observations on Side-Swimming Rainbow Trout in Water Recirculation Aquaculture Systems
title_fullStr Observations on Side-Swimming Rainbow Trout in Water Recirculation Aquaculture Systems
title_full_unstemmed Observations on Side-Swimming Rainbow Trout in Water Recirculation Aquaculture Systems
title_short Observations on Side-Swimming Rainbow Trout in Water Recirculation Aquaculture Systems
title_sort observations on side-swimming rainbow trout in water recirculation aquaculture systems
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4270422/
https://www.ncbi.nlm.nih.gov/pubmed/25250476
http://dx.doi.org/10.1080/08997659.2014.938870
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