Limited evidence for differential reproductive fitness of wild Atlantic cod in areas of high and low salmon farming density
ABSTRACT: Sea cage fish aquaculture attracts large aggregations of wild fish that feed on farm waste. Fish that associate closely with farms undergo physiological changes, and captive feeding trials indicate possible negative effects on reproductive fitness. However, little is known about the signif...
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ftdatacite:10.6084/m9.figshare.6945332 2023-05-15T15:27:23+02:00 Limited evidence for differential reproductive fitness of wild Atlantic cod in areas of high and low salmon farming density Barrett, Luke STEPHEN SWEARER Harboe, Torstein Karlsen, Ørjan Sonnich Meier TIM DEMPSTER 2018 https://dx.doi.org/10.6084/m9.figshare.6945332 https://figshare.com/articles/Limited_evidence_for_differential_reproductive_fitness_of_wild_Atlantic_cod_in_two_areas_of_high_and_low_salmon_farming_density/6945332 unknown figshare Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY 60205 Marine and Estuarine Ecology incl. Marine Ichthyology FOS Biological sciences dataset Dataset 2018 ftdatacite https://doi.org/10.6084/m9.figshare.6945332 2021-11-05T12:55:41Z ABSTRACT: Sea cage fish aquaculture attracts large aggregations of wild fish that feed on farm waste. Fish that associate closely with farms undergo physiological changes, and captive feeding trials indicate possible negative effects on reproductive fitness. However, little is known about the significance of this phenomenon for reproduction in wild fish over larger spatial scales. To assess if coastal areas with intensive aquaculture impact the fitness of wild fish, we collected Atlantic cod Gadus morhua from 2 areas, one with high and and one with low salmon farming density (HFD and LFD respectively) in south-western Norway, a region that hosts the world’s largest coastal fish aquaculture industry. We conducted a captive spawning trial and compared a range of reproductive fitness metrics. Two fatty acids that occur at high levels in commercial feed, oleic and lineoleic acid, were strongly correlated in the ovaries of HFD fish, but a comparison of lipid profiles between HFD and LFD fish showed no differences in total lipids or essential fatty acids. Although HFD fish were slightly larger than LFD fish and had similar body condition, the volume of eggs produced did not differ, indicating relatively lower reproductive investment by HFD fish. HFD eggs were 5% smaller than LFD eggs, which did not lead to differential hatching success but may have contributed to HFD larvae being 8% smaller than their LFD counterparts at 40 days post spawning. The potential for cumulative effects of smaller eggs and larvae on fitness at later life stages warrants further investigation. Dataset atlantic cod Gadus morhua DataCite Metadata Store (German National Library of Science and Technology) Norway |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
60205 Marine and Estuarine Ecology incl. Marine Ichthyology FOS Biological sciences |
spellingShingle |
60205 Marine and Estuarine Ecology incl. Marine Ichthyology FOS Biological sciences Barrett, Luke STEPHEN SWEARER Harboe, Torstein Karlsen, Ørjan Sonnich Meier TIM DEMPSTER Limited evidence for differential reproductive fitness of wild Atlantic cod in areas of high and low salmon farming density |
topic_facet |
60205 Marine and Estuarine Ecology incl. Marine Ichthyology FOS Biological sciences |
description |
ABSTRACT: Sea cage fish aquaculture attracts large aggregations of wild fish that feed on farm waste. Fish that associate closely with farms undergo physiological changes, and captive feeding trials indicate possible negative effects on reproductive fitness. However, little is known about the significance of this phenomenon for reproduction in wild fish over larger spatial scales. To assess if coastal areas with intensive aquaculture impact the fitness of wild fish, we collected Atlantic cod Gadus morhua from 2 areas, one with high and and one with low salmon farming density (HFD and LFD respectively) in south-western Norway, a region that hosts the world’s largest coastal fish aquaculture industry. We conducted a captive spawning trial and compared a range of reproductive fitness metrics. Two fatty acids that occur at high levels in commercial feed, oleic and lineoleic acid, were strongly correlated in the ovaries of HFD fish, but a comparison of lipid profiles between HFD and LFD fish showed no differences in total lipids or essential fatty acids. Although HFD fish were slightly larger than LFD fish and had similar body condition, the volume of eggs produced did not differ, indicating relatively lower reproductive investment by HFD fish. HFD eggs were 5% smaller than LFD eggs, which did not lead to differential hatching success but may have contributed to HFD larvae being 8% smaller than their LFD counterparts at 40 days post spawning. The potential for cumulative effects of smaller eggs and larvae on fitness at later life stages warrants further investigation. |
format |
Dataset |
author |
Barrett, Luke STEPHEN SWEARER Harboe, Torstein Karlsen, Ørjan Sonnich Meier TIM DEMPSTER |
author_facet |
Barrett, Luke STEPHEN SWEARER Harboe, Torstein Karlsen, Ørjan Sonnich Meier TIM DEMPSTER |
author_sort |
Barrett, Luke |
title |
Limited evidence for differential reproductive fitness of wild Atlantic cod in areas of high and low salmon farming density |
title_short |
Limited evidence for differential reproductive fitness of wild Atlantic cod in areas of high and low salmon farming density |
title_full |
Limited evidence for differential reproductive fitness of wild Atlantic cod in areas of high and low salmon farming density |
title_fullStr |
Limited evidence for differential reproductive fitness of wild Atlantic cod in areas of high and low salmon farming density |
title_full_unstemmed |
Limited evidence for differential reproductive fitness of wild Atlantic cod in areas of high and low salmon farming density |
title_sort |
limited evidence for differential reproductive fitness of wild atlantic cod in areas of high and low salmon farming density |
publisher |
figshare |
publishDate |
2018 |
url |
https://dx.doi.org/10.6084/m9.figshare.6945332 https://figshare.com/articles/Limited_evidence_for_differential_reproductive_fitness_of_wild_Atlantic_cod_in_two_areas_of_high_and_low_salmon_farming_density/6945332 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.6945332 |
_version_ |
1766357815902863360 |