DHA and EPA levels in a piscivorous fish changed by preying upon stocked salmon fry
Abstract Increases in prey population size can affect the physiology and ecology of upper-trophic level organisms. This phenomenon is known as a bottom-up effect. For example, the increased abundance of prey resources can trigger physiological (internal) changes in predators, such as improvements in...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-09-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-42530-2 |
| _version_ | 1797453257308635136 |
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| author | Koh Hasegawa Yutaka Yano Kentaro Honda Yuhei Ogura |
| author_facet | Koh Hasegawa Yutaka Yano Kentaro Honda Yuhei Ogura |
| author_sort | Koh Hasegawa |
| collection | DOAJ |
| description | Abstract Increases in prey population size can affect the physiology and ecology of upper-trophic level organisms. This phenomenon is known as a bottom-up effect. For example, the increased abundance of prey resources can trigger physiological (internal) changes in predators, such as improvements in nutritional status. However, these physiological aspects of bottom-up effects have not been considered. In this study, we tested the hypothesis that white-spotted charr Salvelinus leucomaenis, a salmonid fish, increases body stores of omega-3 fatty acids, especially docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), by preying upon stocked hatchery-reared masu salmon Oncorhynchus masou fry in streams. The dynamics of fatty acid contents in charr inhabiting salmon-stocked and unstocked streams clearly support this hypothesis: fatty acid contents (DHA, EPA, and total fatty acid) increased after stocking in stocked streams, but not in unstocked streams. In addition, DHA increased with increasing body size of white-spotted charr and vice versa for EPA. The impacts of human activities, such as fish stocking, on freshwater ecosystems are a matter of serious concern for conservation. Future attempts to gain a comprehensive understanding of the impacts of fish stocking should consider not only community ecology but also physiology. |
| first_indexed | 2024-03-09T15:20:12Z |
| format | Article |
| id | doaj.art-19b044f3991448bc831c0bb4cd206105 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-09T15:20:12Z |
| publishDate | 2023-09-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-19b044f3991448bc831c0bb4cd2061052023-11-26T12:50:30ZengNature PortfolioScientific Reports2045-23222023-09-011311710.1038/s41598-023-42530-2DHA and EPA levels in a piscivorous fish changed by preying upon stocked salmon fryKoh Hasegawa0Yutaka Yano1Kentaro Honda2Yuhei Ogura3Fisheries Resources Institute, Japan Fisheries Research and Education AgencyFisheries Resources Institute, Japan Fisheries Research and Education AgencyFisheries Resources Institute, Japan Fisheries Research and Education AgencyFisheries Resources Institute, Japan Fisheries Research and Education AgencyAbstract Increases in prey population size can affect the physiology and ecology of upper-trophic level organisms. This phenomenon is known as a bottom-up effect. For example, the increased abundance of prey resources can trigger physiological (internal) changes in predators, such as improvements in nutritional status. However, these physiological aspects of bottom-up effects have not been considered. In this study, we tested the hypothesis that white-spotted charr Salvelinus leucomaenis, a salmonid fish, increases body stores of omega-3 fatty acids, especially docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), by preying upon stocked hatchery-reared masu salmon Oncorhynchus masou fry in streams. The dynamics of fatty acid contents in charr inhabiting salmon-stocked and unstocked streams clearly support this hypothesis: fatty acid contents (DHA, EPA, and total fatty acid) increased after stocking in stocked streams, but not in unstocked streams. In addition, DHA increased with increasing body size of white-spotted charr and vice versa for EPA. The impacts of human activities, such as fish stocking, on freshwater ecosystems are a matter of serious concern for conservation. Future attempts to gain a comprehensive understanding of the impacts of fish stocking should consider not only community ecology but also physiology.https://doi.org/10.1038/s41598-023-42530-2 |
| spellingShingle | Koh Hasegawa Yutaka Yano Kentaro Honda Yuhei Ogura DHA and EPA levels in a piscivorous fish changed by preying upon stocked salmon fry Scientific Reports |
| title | DHA and EPA levels in a piscivorous fish changed by preying upon stocked salmon fry |
| title_full | DHA and EPA levels in a piscivorous fish changed by preying upon stocked salmon fry |
| title_fullStr | DHA and EPA levels in a piscivorous fish changed by preying upon stocked salmon fry |
| title_full_unstemmed | DHA and EPA levels in a piscivorous fish changed by preying upon stocked salmon fry |
| title_short | DHA and EPA levels in a piscivorous fish changed by preying upon stocked salmon fry |
| title_sort | dha and epa levels in a piscivorous fish changed by preying upon stocked salmon fry |
| url | https://doi.org/10.1038/s41598-023-42530-2 |
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