Population Aspects Of Graceful Mojarra Eucinostomus Gracilis (Perciformes: Gerreidae) In A Coastal Lagoon In The Tropical Eastern Pacific

TURKISH JOURNAL OF FISHERIES AND AQUATIC SCIENCES(2020)

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摘要
Graceful mojarra (Eucinostomus gracilis) is an important component of the ichthyic fauna of lagoon systems but knowledge of its population aspects is scarce. Monthly samples in the Bahia Magdalena-Almejas Lagoon system (March-August, 2014-2017) were obtained with a trawling net. Abundance was estimated using the swept area method and its spatial variation; and the maturity size was determined using the logistic method. The sex ratio for mature and immature populations, and their length-weight relationship were estimated; FISAT was used to estimate the growth and recruitment parameters. Abundance ranged from 0.6 to 203 ind-Ha(-1) with changes for each lagoon system areas and among years. Size at maturity (L-50) was 132 mm in total length (TL) for the population, 129 mm TL females, and 135 mm TL males. Considering the population of the total organisms, L-50 indicated that 18% were adults and 82% were juveniles. Juvenile dominance indicated that this lagoon system is used for grow-out. The smaller ratio of adults organisms does not allow the assertion that the priority of the area is for reproduction. E. gracilis showed moderate growth (K=0.56 year(-1)) with longevity of 5.4 years and asymptotic length of L-infinity=195 mm.
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关键词
Eucinostomus gracillis, Magdalena Bay, Size at maturity, Growth, Recruitment
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