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• W4221035747 abstract "Feeding by zooplanktivorous fish depends on their foraging movements and the flux of prey to which they are exposed. While prey flux is a linear function of zooplankton density and flow speed, those two factors are expected to contribute differently to fish movements. Our objective was to determine the effects of these factors for garden eels, stationary fish that feed while anchored to the sandy bottom by keeping the posterior parts of their bodies inside a burrow. Using a custom-made flume with a sandy bottom, we quantified the effects of prey density and flow speed on feeding rates by spotted garden eels (Heteroconger hassi). Feeding rates increased linearly with prey density. However, feeding rates did not show a linear relationship with flow speed and decreased at 0.25 m s-1. Using label-free tracking of body points and 3D movement analysis, we found that the reduction in feeding rates was related to modulation of the eel's movements, whereby the expected increase in energy expenditure was avoided by reducing exposure and drag. No effects of flow speed on strike speed, reactive distance or vectorial dynamic body acceleration (VeDBA) were found. A foraging model based on the body length extended from the burrow showed correspondence with observations. These findings suggest that as a result of their unique foraging mode, garden eels can occupy self-made burrows in exposed shelter-free sandy bottoms where they can effectively feed on drifting zooplankton." @default.
• W4221035747 created "2022-04-03" @default.
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• W4221035747 date "2022-04-15" @default.
• W4221035747 modified "2023-10-14" @default.
• W4221035747 title "Effects of prey density and flow speed on plankton feeding by garden eels: a flume study" @default.
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• W4221035747 doi "https://doi.org/10.1242/jeb.243655" @default.
• W4221035747 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35315487" @default.
• W4221035747 hasPublicationYear "2022" @default.
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