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首页> 美国政府科技报告 >Evaluation of Strategies for Managing Rock Bass (Ambloplites rupestris) Populations in Ozark Streams. Job 3: Evaluate Strategies for Producing and Managing Quality Rock Bass Fisheries
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Evaluation of Strategies for Managing Rock Bass (Ambloplites rupestris) Populations in Ozark Streams. Job 3: Evaluate Strategies for Producing and Managing Quality Rock Bass Fisheries

机译：欧扎克河流域岩棉（ambloplites rupestris）种群管理策略评价。工作3：评估生产和管理优质摇滚低音渔业的策略

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The authors imposed a 9-in minimum length limit on a heavily exploited rock bass (Ambloplites rupestris) population in the Big Piney River, Missouri, to evaluate responses of population attributes (size distribution, abundance, growth, and mortality) and fishery measures (effort, catch, catch rate, harvest, harvest rate, regulation compliance, and attitudes about the regulation) for rock bass and smallmouth bass (Micropterus dolomieu). Assessments occurred in a 17.1-km 'regulation' section and a 10.4km 'reference' section in the three years before length limit implementation (1992-1994), during the year of implementation (1995), and for the ensuing five years (1996-2000). In the regulation area, mean abundance of 'adult' rock bass (180 mm and larger) increased 129%, while mean abundance in the reference area declined 39%. 'Adult' smallmouth bass (230 mm and larger) in the regulation area increased 82%, while mean abundance decreased 18% in the reference area. Growth rates changed little for either species during the study. Strong and weak year classes of both species during the study precluded informative estimates of mortality. Decreases in fishing effort and fish harvest in the regulation area corresponded with subsequent increases in population abundance of both species, which resulted in increases in catch rates of both species. Angler perceptions of rock bass fishery quality improved modestly. In general, anglers were well aware of the regulations, supported them, and complied with them. This study confirmed earlier concerns that the scope for growth of rock bass would limit management opportunities involving length limits. The 9-in minimum length limit evaluated in this study will increase numbers of larger rock bass, but opportunities to legally harvest rock bass will be limited. This length limit (or larger) would be best suited to producing a fishery for anglers who seek large rock bass and who generally practice catch and release. An 8-in minimum length limit would produce a fishery for anglers who are less particular about size and who enjoy harvesting some fish for consumption; this regulation has been implemented on sections of the Osage Fork and Eleven Point rivers and a third section on the Big Piney River is being considered.

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