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River Clyde Fisheries
Management Trust Ltd. |
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Blockages
Blockages natural/man-made. Salmonids need to migrate to
spawn, adult trout or salmon will migrate upstream to the spawning grounds
or redds. If their passage is obstructed it can quickly lead to a massive
decrease in the numbers of juveniles which would normally be found above the
barrier/blockage. Man-made obstacles such as weirs and dams can be bypassed
by means of a fish ladder etc. Natural blockages such as fallen trees need
to be removed manually. It is important to keep as much of the river (open
to fish) if it is to remain healthy. Loss of fish populations lead to loss
of predators such as otters, kingfishers and herons etc.
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