An All-Season Trap for Downstream-Migrating Fish and Other Aquatic Organisms

Sampling Larval and Juvenile Fish Populations in Freshwater

“…Fixed weirs (Foerster, 1930) or traps (Shetter, 1938;Wolf, 1951;McLain and Manion, 1967) can be utilized for the particular case of young fish migrating downstream. These, however, generally require installation of bulky, permanent, and often expensive impounding devices.…”

A Simple and Inexpensive Trap for Catching Downstream Migrants

“…The sub-sampling techniques of scoop traps (Meehan, 1964), dip traps (Mason, 1966) and fyke nets (Craddock, 1959) make them unsuitable for research in which a high recovery of marked stocked fish is required. Wolf traps (Wolf, 1950) and inclined screen traps (McLain and Manion, 1967) were designed to catch all downstream migrants, but the size and permanent nature of these designs made them unsuitable for the investigations, briefly reported here, because of their cost and lack of portability.…”

Remotely Operated Trap for Capture of Territorial Fishes

“…Many fish traps have been designed for operation in specific types of habitats or for capture of selected species (McClain and Manion 1967;Marlborough 1969;Lawler 1973;Collins 1975;Bloom 1976;Graser 1978). However, such traps operate in a passive manner to collect all fish that swim or drift into them.…”