Feeding the river: The fate of feed-pellet-derived material escaping from land-based trout farms
| Autor: | Roucaute Marc, Le Bris Hervé, Huteau Dominique, Roussel Jean-Marc, Perdriau Martine, Guilpart Alexis |
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| Přispěvatelé: | Écologie et santé des écosystèmes (ESE), Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Fish farming Multiple-source mixing models 010501 environmental sciences Aquatic Science 01 natural sciences Food chain Aquaculture Benthic communities 14. Life underwater 0105 earth and related environmental sciences Stable isotopes [SDV.EE]Life Sciences [q-bio]/Ecology environment Detritus biology business.industry [SDE.IE]Environmental Sciences/Environmental Engineering 010604 marine biology & hydrobiology Detritivore Fish farms biology.organism_classification [SDE.ES]Environmental Sciences/Environmental and Society 6. Clean water Fishery Trout Benthic zone Oncorhynchus mykiss Stream Rainbow trout business |
| Zdroj: | Aquaculture Aquaculture, Elsevier, 2018, 495, pp.172-178. ⟨10.1016/j.aquaculture.2018.05.050⟩ |
| ISSN: | 0044-8486 |
| DOI: | 10.1016/j.aquaculture.2018.05.050⟩ |
| Popis: | French Ministry of Agriculture (8PP) (CASDAR PROPRE project); INRA; Brittany Region This research was financially supported by the French Ministry of Agriculture (8PP) (CASDAR PROPRE project), INRA and the Brittany Region (Ph.D. grant of Alexis Guilpart).; International audience; Environmental impacts of intensive fish cultivation on receiving food webs have been investigated mainly for cage culture systems in lake and marine ecosystems; however, the potential influence of land-based salmonid farms on rivers is less documented. Stable C and N isotopes were used to examine the influence of aquaculture waste on aquatic organisms in three streams with different discharge rates (1–5 m3·s−1) that receive effluents from rainbow trout (Oncorhynchus mykiss) farms with different rearing capacities (100–600 t wet weight per year). Feed pellets from each farm were significantly 13C-enriched (up to +8‰ δ13C) compared to the isotopic backgrounds of the receiving streams. Benthic invertebrates (detritivores and predators) and small-bodied fish were consistently 13C-enriched downstream the fish farm effluents. This pattern was stronger for low stream discharges and high-production farms. The trophic niche breadths of these organisms, estimated by the spread of their isotopic values. decreased in downstream these farms, suggesting a reduction in the diversity of dietary sources. Upstream-downstream comparisons based on multiple-source mixing models revealed high contributions (40–88%) of pellet-derived material in their diet, which indicates that waste from land-based salmonid farms enhanced the detritus-based food chain via this particulate route. |
| Databáze: | OpenAIRE |
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