Guidance apparatus and method for anadromous fish

Abstract

Migrating anadromous fish, and particularly salmonoid smolts, are guided in or by elongate faster moving channels defined in a body of slower moving water. Ring-like support frames are supported by floats and anchors in a water body at spaced distances along a faster moving channel to be defined. Each support frame carries one or more nozzles that receive pressurized water from a water supply system and disperse that water toward the next spacedly adjacent downstream support frame to define the faster moving channels without use of physical peripheral boundary members. The water supply system may be associated with individual support frames or with a plurality of support frames to receive water from the body in which the faster moving channel is defined and pressurize that water for dispersement. Fish are introduced into the upstream portion of the faster moving channel and instinctively tend to remain within the channel so long as the faster water motion exists therein. The system may be used to direct fish movement through small areas or large dam backwaters and is particularly adaptable to surface oriented fish channelization.

Dependencies are inferred from the claim text.