Modeling the effect of varying swim speeds on fish passage through velocity barriers
fish passage, high velocity, barriers, models
Journal or Book Title
Transactions of the American Fisheries Society
The distance fish can swim through zones of high-velocity flow is an important factorlimiting the distribution and conservation of riverine and diadromous fishes. Often, these barriersare characterized by nonuniform flow conditions, and it is likely that fish will swim at varyingspeeds to traverse them. Existing models used to predict passage success, however, typicallyinclude the unrealistic assumption that fish swim at a constant speed regardless of the speed offlow. This paper demonstrates how the maximum distance of ascent through velocity barriers canbe estimated from the swim speed–fatigue time relationship, allowing for variation in both swimspeed and water velocity.