Chaparro-Moreno, Fabian O.

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    Analisis de distribucion usando datos de electropesca de dos especies de peces, Lobina micropterus salmoides (Lacepede, 1802) y Tucanare, Cichla ocellaris (Bloch & Shneider, 1801) en el embalse La Plata
    (2013) Chaparro-Moreno, Fabian O.; Kubaryk, John M.; College of Arts and Sciences - Sciences; García, Jorge R.; Valdés Pizzini, Manuel; López, José M.; Department of Marine Sciences; Colon, Silvestre
    La Plata Reservoir is one of the more important Puerto Rican artificial lakes; from ecological and environmental perspectives this freshwater system is home to a large number of aquatic species that can be affected by anthropogenic influences and/or by environmental processes. The purpose of this investigation was to use the capture rates of peacock bass, (Cichla ocellaris), and largemouth bass, (Micropterus salmoides), in the La Plata Reservoir sampled by electrofishing to determine their population dynamics at six locations. Of the five samplings that were carried out, the one in December 2009 was nocturnal, while the remaining four that took place during March through December 2010, were all diurnal. The intervals between samplings were from 2 to 3 months. Seventy-one percent of the total fish captured were peacock bass (n = 212) while 29% were largemouth bass (n = 85); implying that they coexist and they do not mutually exclude themselves in the locations sampled. Fifty-five per cent of the largemouth bass were found to weight between 600 to 1,200 grams while only 8% of peacock bass attained this weight. Neither sampling dates or sites had significant (p > 0.05) effects on the number of largemouth bass captured, however, the number of peacock bass captured in December 2009 and June 2010 were significantly greater (p < 0.05) while those captured in December 2010 were significantly fewer (p < 0.05) than the other dates. The sites of capture of the largemouth bass sampled on December 2009, March 2010, and June 2010 had no a significant effect on their weight. However, largemouth bass sampled at site 1 on September 2010 weighed significantly less (p < 0.05) than the other sites (2, 3, and 5) where largemouth bass were captured. While largemouth bass captured in December 2010 at site 5 had a significantly greater average weight (p < 0.05) than sites 2, 3, 4, and 6, while those from site 1 weighed significantly less (p < 0.05). Sampling dates had no significant (p > 0.05) effect on the weights of peacock bass captured on March, June, September, and December 2010. However, peacock bass captured in December 2009 from site 1 weighed significantly less (p < 0.05) than those from sites 3, 5, and 6. Site 5 appears to have yielded heavier fish than the other sites, but not on a consistent basis, and since no by-catch data was taken the most that can be made of this trend is that it would be the recommended fishing site among those sampled