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Modeling the Effect of Varying Swim Speeds on Fish Passage through Velocity Barriers
Author(s) -
CastroSantos Theodore
Publication year - 2006
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/t05-262.1
Subject(s) - traverse , fish <actinopterygii> , limiting , flow velocity , environmental science , flow (mathematics) , mechanics , fish migration , fishery , geology , physics , biology , geodesy , engineering , mechanical engineering
The distance fish can swim through zones of high‐velocity flow is an important factor limiting the distribution and conservation of riverine and diadromous fishes. Often, these barriers are characterized by nonuniform flow conditions, and it is likely that fish will swim at varying speeds to traverse them. Existing models used to predict passage success, however, typically include the unrealistic assumption that fish swim at a constant speed regardless of the speed of flow. This paper demonstrates how the maximum distance of ascent through velocity barriers can be estimated from the swim speed–fatigue time relationship, allowing for variation in both swim speed and water velocity.