Before sampling can occur, you need a scientific collection permit and information on the area like the stream size, water depth, conductivity, and water temperature. To collect a certain species, you need to know its spawning time, migratory behavior, and habitats used by each age class. In BC, most habitat and fish inventory studies are done during the period of lowest stream flow that the juveniles will encounter during the main growing season (referred to as the critical stream flow period (CSFP)), which in BC occurs between August and October.

There are two general categories that fish capture techniques can fall under active and passive techniques. Passive capture gear is usually set and left stationary for a period of time. Passive capture gear can be divided into entrapment or entanglement. Entanglement includes gill nets, and trammel nets, while entrapment includes trap nets, minnow traps, and weirs. Active capture gear is moved through the water by machinery or human power and includes pole seines, electrofishing, and angling.

References:

Neilsen, L. A., D. L. Johnson, editors. 1992. Fisheries Techniques. Pages 95-145.Southern Printing

Company, Inc. Blacksburg, Virginia. Oct. 99

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