Factors Affecting Trap-Net Catchability of Black Crappies in Natural Minnesota Lakes

Autor:	Michael C. McInerny, Timothy K. Cross
Rok vydání:	2006
Předmět:	Fishery geography geography.geographical_feature_category Ecology Maximum depth Spring (hydrology) Environmental science Fish Management Monitoring Policy and Law Aquatic Science Ecology Evolution Behavior and Systematics Intraspecific competition
Zdroj:	North American Journal of Fisheries Management. 26:652-664
ISSN:	1548-8675 0275-5947
Popis:	We quantified the effects of length-group (150–199, 200–249, and 250–299 mm), sampling period (September, October, early spring, and late spring), lake, and intraspecific density on catchability q of black crappies Pomoxis nigromaculatus in trap nets (modified fyke nets) set in eight natural Minnesota lakes during 1996–2001. The catchability of the two larger length-groups exceeded that of the smallest length-group in all lakes. Catchability in early and late spring exceeded that in September or October in most lakes; otherwise, q did not differ among sampling periods. Catchability differed among lakes during September, October, and early-spring sampling periods but did not differ among lakes in late spring. For 150–199-mm fish, q increased with increasing lake surface area during all sampling periods, decreased with increasing shoreline development ratio during all periods, decreased with increasing maximum depth during fall sampling periods, and was unrelated to the percentage of surface area o...
Databáze:	OpenAIRE
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