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14 May 2019 ASSESSMENT OF LARGEMOUTH BASS (MICROPTERUS SALMOIDES) POPULATION CHARACTERS IN A NORTHEASTERN MEXICO IMPOUNDMENT
Arturo Jose Vale, Frances Gelwick
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Abstract

We assessed the demographic characters of a largemouth bass (Micropterus salmoides) population in a small impoundment in northeastern Mexico. We collected largemouth bass across 3 years during fall and summer by electrofishing, gill netting, and seining. We evaluated size and age structure, mortality, recruitment, and individual fish growth. We also completed yield-per-recruit simulations to evaluate the effects of minimum length limits on the fishery. A common feature among length and age distributions was the rapid decline in larger fish (≥350 mm total length) and older fish (>3 years). Catch curves constructed from age-frequency data indicated an annual mortality rate of 59%. Age-frequency distributions and catch curves also indicated a stable pattern of recruitment. Analysis of mean length-at-age and von Bertalanffy growth parameters suggested largemouth bass grew rapidly early in life, surpassing 200 mm in total length by age 1 and 300 mm in total length by age 3. Yield-per-recruit simulations showed that a trade-off occurred between angler yield, number of fish harvested, and mean size of fish harvested as size limits were increased.

Arturo Jose Vale and Frances Gelwick "ASSESSMENT OF LARGEMOUTH BASS (MICROPTERUS SALMOIDES) POPULATION CHARACTERS IN A NORTHEASTERN MEXICO IMPOUNDMENT," The Southwestern Naturalist 63(2), 112-123, (14 May 2019). https://doi.org/10.1894/0038-4909-63-2-112
Received: 2 June 2017; Accepted: 8 October 2018; Published: 14 May 2019
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