The Effects of Different Feed Ration Levels on Growth, Welfare Rating, and Early Maturation in Juvenile Atlantic Salmon ( Salmo salar )
To investigate the possible effect of different feed ration levels on the growth, welfare, and early maturation of juvenile Atlantic salmon, 450 salmon parr with a mean (±standard error) initial weight of 51.6 g (±0.8) were reared in triplicate under three different feed ration levels for five month...
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ftdoajarticles:oai:doaj.org/article:32f7bac1245d4589bd15c644f5251a4a 2024-09-15T17:56:00+00:00 The Effects of Different Feed Ration Levels on Growth, Welfare Rating, and Early Maturation in Juvenile Atlantic Salmon ( Salmo salar ) Albert Kjartan Dagbjartarson Imsland Hjörtur Methúsalemsson 2024-02-01T00:00:00Z https://doi.org/10.3390/fishes9020070 https://doaj.org/article/32f7bac1245d4589bd15c644f5251a4a EN eng MDPI AG https://www.mdpi.com/2410-3888/9/2/70 https://doaj.org/toc/2410-3888 doi:10.3390/fishes9020070 2410-3888 https://doaj.org/article/32f7bac1245d4589bd15c644f5251a4a Fishes, Vol 9, Iss 2, p 70 (2024) Atlantic salmon feeding management sexual maturation fish welfare Biology (General) QH301-705.5 Genetics QH426-470 article 2024 ftdoajarticles https://doi.org/10.3390/fishes9020070 2024-08-05T17:49:58Z To investigate the possible effect of different feed ration levels on the growth, welfare, and early maturation of juvenile Atlantic salmon, 450 salmon parr with a mean (±standard error) initial weight of 51.6 g (±0.8) were reared in triplicate under three different feed ration levels for five months. The control group (100r) was fed every day, the 50r group was fed every other day, and the 33r group was fed every third day. In every group, 75 fish (half of the group) were individually tagged for monitoring of growth. The number of fin wounds was used as the welfare indicator, and to inspect the development of maturation, all fish were euthanized, and development of the gonads was monitored by visual inspection at the termination of the trial. The control group (100r) showed a significantly higher specific growth rate (0.90% day −1 ) compared to the lower fed groups (50r, 0.67% day −1 and 33r, 0.49% day −1 ); however, the growth difference was 21–24% less than expected solely on the difference in the amount of feed given to each group. The 100r group showed the highest welfare rating, and the 33r group the lowest possible, indicating more aggressive behaviour and fin biting due to feed restriction in the 33r group. No difference ( p > 0.45) was found in the development of maturation in females, but the combined numbers of males in maturity stages 2–5 showed an overall trend towards slower maturation in the 33r group compared to the 100r group. Although the present findings on the development of sexual maturation were subtle due to the limited time frame of the trial, the findings offer a foundation for future investigation into the relationship between the feed ration level and the development of sexual maturation in the rearing of juvenile Atlantic salmon. Article in Journal/Newspaper Atlantic salmon Salmo salar Directory of Open Access Journals: DOAJ Articles Fishes 9 2 70 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Atlantic salmon feeding management sexual maturation fish welfare Biology (General) QH301-705.5 Genetics QH426-470 |
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Atlantic salmon feeding management sexual maturation fish welfare Biology (General) QH301-705.5 Genetics QH426-470 Albert Kjartan Dagbjartarson Imsland Hjörtur Methúsalemsson The Effects of Different Feed Ration Levels on Growth, Welfare Rating, and Early Maturation in Juvenile Atlantic Salmon ( Salmo salar ) |
topic_facet |
Atlantic salmon feeding management sexual maturation fish welfare Biology (General) QH301-705.5 Genetics QH426-470 |
description |
To investigate the possible effect of different feed ration levels on the growth, welfare, and early maturation of juvenile Atlantic salmon, 450 salmon parr with a mean (±standard error) initial weight of 51.6 g (±0.8) were reared in triplicate under three different feed ration levels for five months. The control group (100r) was fed every day, the 50r group was fed every other day, and the 33r group was fed every third day. In every group, 75 fish (half of the group) were individually tagged for monitoring of growth. The number of fin wounds was used as the welfare indicator, and to inspect the development of maturation, all fish were euthanized, and development of the gonads was monitored by visual inspection at the termination of the trial. The control group (100r) showed a significantly higher specific growth rate (0.90% day −1 ) compared to the lower fed groups (50r, 0.67% day −1 and 33r, 0.49% day −1 ); however, the growth difference was 21–24% less than expected solely on the difference in the amount of feed given to each group. The 100r group showed the highest welfare rating, and the 33r group the lowest possible, indicating more aggressive behaviour and fin biting due to feed restriction in the 33r group. No difference ( p > 0.45) was found in the development of maturation in females, but the combined numbers of males in maturity stages 2–5 showed an overall trend towards slower maturation in the 33r group compared to the 100r group. Although the present findings on the development of sexual maturation were subtle due to the limited time frame of the trial, the findings offer a foundation for future investigation into the relationship between the feed ration level and the development of sexual maturation in the rearing of juvenile Atlantic salmon. |
format |
Article in Journal/Newspaper |
author |
Albert Kjartan Dagbjartarson Imsland Hjörtur Methúsalemsson |
author_facet |
Albert Kjartan Dagbjartarson Imsland Hjörtur Methúsalemsson |
author_sort |
Albert Kjartan Dagbjartarson Imsland |
title |
The Effects of Different Feed Ration Levels on Growth, Welfare Rating, and Early Maturation in Juvenile Atlantic Salmon ( Salmo salar ) |
title_short |
The Effects of Different Feed Ration Levels on Growth, Welfare Rating, and Early Maturation in Juvenile Atlantic Salmon ( Salmo salar ) |
title_full |
The Effects of Different Feed Ration Levels on Growth, Welfare Rating, and Early Maturation in Juvenile Atlantic Salmon ( Salmo salar ) |
title_fullStr |
The Effects of Different Feed Ration Levels on Growth, Welfare Rating, and Early Maturation in Juvenile Atlantic Salmon ( Salmo salar ) |
title_full_unstemmed |
The Effects of Different Feed Ration Levels on Growth, Welfare Rating, and Early Maturation in Juvenile Atlantic Salmon ( Salmo salar ) |
title_sort |
effects of different feed ration levels on growth, welfare rating, and early maturation in juvenile atlantic salmon ( salmo salar ) |
publisher |
MDPI AG |
publishDate |
2024 |
url |
https://doi.org/10.3390/fishes9020070 https://doaj.org/article/32f7bac1245d4589bd15c644f5251a4a |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Fishes, Vol 9, Iss 2, p 70 (2024) |
op_relation |
https://www.mdpi.com/2410-3888/9/2/70 https://doaj.org/toc/2410-3888 doi:10.3390/fishes9020070 2410-3888 https://doaj.org/article/32f7bac1245d4589bd15c644f5251a4a |
op_doi |
https://doi.org/10.3390/fishes9020070 |
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Fishes |
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9 |
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70 |
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1810432221025140736 |