Impact of environmental complexity and stocking density on affective states of rainbow trout ( Oncorhynchus mykiss )
Environmental condition, such as environmental complexity or stocking density, can directly or indirectly influence animal emotion and ultimately, affective state. Affective states of animals can be assessed through judgement bias tests, evaluating responses to ambiguous situations. In this study, w...
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Online Access: | http://hdl.handle.net/10919/113656 https://doi.org/10.1007/s10071-022-01616-6 |
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ftvirginiatec:oai:vtechworks.lib.vt.edu:10919/113656 2024-05-19T07:37:50+00:00 Impact of environmental complexity and stocking density on affective states of rainbow trout ( Oncorhynchus mykiss ) Animal Cognition Anderson, Mallory G. Campbell, Andrew M. Kuhn, David D. Smith, Stephen A. Jacobs, Leonie 2022-04-16 13 page(s) application/pdf http://hdl.handle.net/10919/113656 https://doi.org/10.1007/s10071-022-01616-6 en eng Springer http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000782865800001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1 1435-9448 10.1007/s10071-022-01616-6 (PII) http://hdl.handle.net/10919/113656 https://doi.org/10.1007/s10071-022-01616-6 25 5 Kuhn, David [0000-0003-3368-0375] Smith, Stephen [0000-0003-4104-1899] Jacobs, Leonie [0000-0002-3799-5078] 35430682 1435-9456 In Copyright http://rightsstatements.org/vocab/InC/1.0/ Animal welfare Rainbow trout Environmental complexity Enrichment Stocking density Affective state SALMO-TRUTTA-L ATLANTIC SALMON REARING DENSITY BROWN TROUT STRUCTURAL COMPLEXITY STRESS RESPONSES CORTISOL-LEVELS ANIMAL EMOTION COGNITIVE BIAS OVERHEAD COVER Animals Oncorhynchus mykiss Emotions Aquaculture Article - Refereed Article Early Access Journal Text 2022 ftvirginiatec https://doi.org/10.1007/s10071-022-01616-6 2024-04-24T00:22:36Z Environmental condition, such as environmental complexity or stocking density, can directly or indirectly influence animal emotion and ultimately, affective state. Affective states of animals can be assessed through judgement bias tests, evaluating responses to ambiguous situations. In this study, we aimed to determine whether environmental complexity and stocking density impacted rainbow trout affective state. Rainbow trout (n = 108) were housed in recirculating aquaculture systems under commercial conditions while trained at tank-level to discriminate between a positively reinforced chamber (feed) in one location and a negative chamber (positive punishment; chase by net for 1 s) in the opposing location. Fish from successful tanks (two out of five tanks) were then housed in treatment tanks of either high- or low- environmental complexity at either high (165 fish/m3) or low (69 fish/m3) stocking density. Trained fish were tested for latencies to approach three intermediate, ambiguous chambers. Fish housed in high-density tanks were faster to enter all chambers than those housed in low-density tanks (8.5 s vs. 15.2 s; P = 0.001), with faster entries into the positive (7.4 s vs. 15.2 s; P = 0.02) and near-negative chambers (10.2 s vs. 17.4 s; P = 0.006), suggesting that these fish were more optimistic to receive a feed reward. Tank complexity did not affect test outcomes. No differences between treatments were observed between body weight, length, and plasma cortisol. Overall, rainbow trout are capable of discriminating between cues during a judgement bias test and fish housed in high-density environments respond more optimistically in ambiguous situations compared to fish in low-density environments. Accepted version Article in Journal/Newspaper Atlantic salmon VTechWorks (VirginiaTech) Animal Cognition 25 5 1331 1343 |
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VTechWorks (VirginiaTech) |
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English |
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Animal welfare Rainbow trout Environmental complexity Enrichment Stocking density Affective state SALMO-TRUTTA-L ATLANTIC SALMON REARING DENSITY BROWN TROUT STRUCTURAL COMPLEXITY STRESS RESPONSES CORTISOL-LEVELS ANIMAL EMOTION COGNITIVE BIAS OVERHEAD COVER Animals Oncorhynchus mykiss Emotions Aquaculture |
spellingShingle |
Animal welfare Rainbow trout Environmental complexity Enrichment Stocking density Affective state SALMO-TRUTTA-L ATLANTIC SALMON REARING DENSITY BROWN TROUT STRUCTURAL COMPLEXITY STRESS RESPONSES CORTISOL-LEVELS ANIMAL EMOTION COGNITIVE BIAS OVERHEAD COVER Animals Oncorhynchus mykiss Emotions Aquaculture Anderson, Mallory G. Campbell, Andrew M. Kuhn, David D. Smith, Stephen A. Jacobs, Leonie Impact of environmental complexity and stocking density on affective states of rainbow trout ( Oncorhynchus mykiss ) |
topic_facet |
Animal welfare Rainbow trout Environmental complexity Enrichment Stocking density Affective state SALMO-TRUTTA-L ATLANTIC SALMON REARING DENSITY BROWN TROUT STRUCTURAL COMPLEXITY STRESS RESPONSES CORTISOL-LEVELS ANIMAL EMOTION COGNITIVE BIAS OVERHEAD COVER Animals Oncorhynchus mykiss Emotions Aquaculture |
description |
Environmental condition, such as environmental complexity or stocking density, can directly or indirectly influence animal emotion and ultimately, affective state. Affective states of animals can be assessed through judgement bias tests, evaluating responses to ambiguous situations. In this study, we aimed to determine whether environmental complexity and stocking density impacted rainbow trout affective state. Rainbow trout (n = 108) were housed in recirculating aquaculture systems under commercial conditions while trained at tank-level to discriminate between a positively reinforced chamber (feed) in one location and a negative chamber (positive punishment; chase by net for 1 s) in the opposing location. Fish from successful tanks (two out of five tanks) were then housed in treatment tanks of either high- or low- environmental complexity at either high (165 fish/m3) or low (69 fish/m3) stocking density. Trained fish were tested for latencies to approach three intermediate, ambiguous chambers. Fish housed in high-density tanks were faster to enter all chambers than those housed in low-density tanks (8.5 s vs. 15.2 s; P = 0.001), with faster entries into the positive (7.4 s vs. 15.2 s; P = 0.02) and near-negative chambers (10.2 s vs. 17.4 s; P = 0.006), suggesting that these fish were more optimistic to receive a feed reward. Tank complexity did not affect test outcomes. No differences between treatments were observed between body weight, length, and plasma cortisol. Overall, rainbow trout are capable of discriminating between cues during a judgement bias test and fish housed in high-density environments respond more optimistically in ambiguous situations compared to fish in low-density environments. Accepted version |
format |
Article in Journal/Newspaper |
author |
Anderson, Mallory G. Campbell, Andrew M. Kuhn, David D. Smith, Stephen A. Jacobs, Leonie |
author_facet |
Anderson, Mallory G. Campbell, Andrew M. Kuhn, David D. Smith, Stephen A. Jacobs, Leonie |
author_sort |
Anderson, Mallory G. |
title |
Impact of environmental complexity and stocking density on affective states of rainbow trout ( Oncorhynchus mykiss ) |
title_short |
Impact of environmental complexity and stocking density on affective states of rainbow trout ( Oncorhynchus mykiss ) |
title_full |
Impact of environmental complexity and stocking density on affective states of rainbow trout ( Oncorhynchus mykiss ) |
title_fullStr |
Impact of environmental complexity and stocking density on affective states of rainbow trout ( Oncorhynchus mykiss ) |
title_full_unstemmed |
Impact of environmental complexity and stocking density on affective states of rainbow trout ( Oncorhynchus mykiss ) |
title_sort |
impact of environmental complexity and stocking density on affective states of rainbow trout ( oncorhynchus mykiss ) |
publisher |
Springer |
publishDate |
2022 |
url |
http://hdl.handle.net/10919/113656 https://doi.org/10.1007/s10071-022-01616-6 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_relation |
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000782865800001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1 1435-9448 10.1007/s10071-022-01616-6 (PII) http://hdl.handle.net/10919/113656 https://doi.org/10.1007/s10071-022-01616-6 25 5 Kuhn, David [0000-0003-3368-0375] Smith, Stephen [0000-0003-4104-1899] Jacobs, Leonie [0000-0002-3799-5078] 35430682 1435-9456 |
op_rights |
In Copyright http://rightsstatements.org/vocab/InC/1.0/ |
op_doi |
https://doi.org/10.1007/s10071-022-01616-6 |
container_title |
Animal Cognition |
container_volume |
25 |
container_issue |
5 |
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1331 |
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1343 |
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1799477219548987392 |