Influence of Water Conductivity on Pulsed AC and Pulsed DC Electrofishing Catch Rates for Largemouth Bass
| Autor: | Tracy D. Hill, David W. Willis |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Hydrology
food.ingredient Ecology biology Pulsed DC Micropterus Management Monitoring Policy and Law Aquatic Science Conductivity biology.organism_classification Fishery Population estimate Bass (fish) food Electrofishing Environmental science Water conductivity Ecology Evolution Behavior and Systematics |
| Zdroj: | North American Journal of Fisheries Management. 14:202-207 |
| ISSN: | 1548-8675 0275-5947 |
| DOI: | 10.1577/1548-8675(1994)014<0202:iowcop>2.3.co;2 |
| Popis: | Electrofishing is a standard tool for sampling largemouth bass Micropterus salmoides, but high water conductivity hampers electrofishing effectiveness. Population estimates (Petersen method) were determined for largemouth bass in 12 small South Dakota impoundments with water conductivities ranging from 410 to 1,700 μS/cm. Even though pulsed DC catch-per-unit-effort (CPUE) values were obtained during the first electrofishing lap at each impoundment, pulsed AC catch rates from immediately following second laps were significantly higher (P = 0.002). The mean number of hours needed to collect 100 stock-length (≥20 cm) largemouth bass was slightly more than twice as high for pulsed DC as it was for pulsed AC. We developed a multiple-regression model to predict density from pulsed AC CPUE and water conductivity (R 2 = 0.88, P = 0.0001). Pulsed AC CPUE contributed 81% to the model and conductivity contributed 7%; both variables had slopes that were significantly different from zero in the two-variable m... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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