What specific structural feature downstream of a current break is considered prime real estate in river systems for Wels catfish?
Answer
Deep holes scoured out by the current
In flowing river systems, Wels catfish utilize areas that offer strong current breaks combined with necessary depth and cover. Prime locations are often found directly downstream of obstacles like weirs or bridge pilings. The physical force of the water hitting these structures causes erosion, which digs out deep holes or scour pools. These depressions provide the slow-moving or slack water necessary for energy conservation while remaining close to the main current flow, making them ideal staging areas.
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