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A Two‐Compartment Fish Trap for Simultaneously Counting Downstream and Upstream Migrants in Small Rivers
Author(s) -
Mullins C. C.,
Caines P. L.,
Caines D.,
Peppar J. L.
Publication year - 1991
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8675(1991)011<0358:atcftf>2.3.co;2
Subject(s) - trap (plumbing) , downstream (manufacturing) , upstream (networking) , fish <actinopterygii> , upstream and downstream (dna) , environmental science , compartment (ship) , hydrology (agriculture) , fishery , geology , biology , environmental engineering , computer science , geotechnical engineering , oceanography , telecommunications , engineering , operations management
A portable, wooden fish trap for simultaneously counting downstream and upstream migrants in a small river was designed, constructed, and tested. The two‐compartment design provides complete counts by eliminating the need to reposition a trap and counting fence to accommodate peaks of downstream or upstream migration in narrow rivers. An adjustable partition separating downstream and upstream compartments permits either compartment to hold more fish. Once constructed, the trap can be assembled or dismantled by two people in 1 h. It was operated successfully during five consecutive years, from June to October, in water depths ranging from 9.0 to 72.0 cm and at discharges greater than 6.124 m 3 /s. Cost of this improved trap was Can$800.