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Abundancia y madurez sexual de Anadara similis en el manglar de Luisico, Bahía Malaga, Pacífico colombiano.

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Author
Manjarrés Villamil, Alex E.
Lucero Rincón, Carlos H.
Walteros, William O.
Cantera Kintz, Jaime R.
Gil Agudelo, Diego L.
Date
2013

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Alternative Title
Abundance and sexual maturity of the bivalve Anadara similis in Luisico mangrove, Bahía Málaga, Colombian Pacific
Abstract
La abundancia y madurez sexual de la piangua Anadara similis fue analizada mensualmente entre septiembre de 2009 y agosto de 2010 en el archipiélago de La Plata, Bahía Málaga, Pacífico colombiano. La madurez sexual se analizó a nivel macroscópico mediante la observación del tejido reproductivo en fresco y microscópico por medio de métodos histológicos estándares. Se estimó una densidad media de 0.130 ± 0.098 ind/m2 y una talla media de 42.30 ± 5.00 mm. Los meses de mayor densidad fueron mayo (0.295 ind/m2) y agosto (0.195 ind/m2). La talla media de madurez sexual fue de 41.8 ± 4.5 mm y talla media de 41 mm donde 50% de la población ha tenido mínimo un desove (L50%). Se registraron picos máximos reproductivos durante marzo (83.3%) y abril (75.0%), aunque durante todos los meses de estudio se evidenció actividad reproductiva. El 4.30% de los individuos presentaron casos de hermafroditismo, representando el primer registro de este tipo para la especie. La mayor densidad, mayor talla media, mayor rendimiento de carne en hembras y la presencia de un mayor volumen de tejido reproductivo femenino en hermafroditas, sugiere procesos de reversión sexual en esta especie, lo cual debería ser estudiado en detalle. Las bajas tallas de captura y de madurez sexual, así como la baja densidad de individuos encontrada, pueden ser producto de la alta presión por pesca, modificaciones de hábitat y procesos de contaminación, los cuales deben ser estudiados con el fin de implementar estrategias de manejo para este recurso en el área.
Sexual maturity of these organisms was studied at macroscopic level using fresh samples and at microscopic level using standard histological techniques. The mean density was estimated in 0.130 ± 0.098 ind/m 2 and the mean size was 42.30 ± 5.00 mm. Months with the presence of the highest densities of piangua were May (0.295 ind/m 2 ) and August (0.195 ind/m 2 ). The mean sexual maturity size was estimated in 41.8 ± 4.5 mm, while the size at which at least 50% of the population of A. similis have had its first spawn was estimated in 41 mm. Reproductive activity of the species was present year-round with higher peaks in March (83.33%) and April (75.00%). 4.30% of organisms analyzed showed signs of hermaphroditism, being this the first record of this kind for he abundance and sexual maturity of piangua Anadara similis in La Plata Archipelago, Bahía Málaga, Pacific coast of Colombia, was analyzed between September the species. Higher density, larger mean size, higher meat yield in females as well as the presence of more female reproductive tissue, suggest a process of sexual reversion in the species, which have to be further studied. Low capture and sexual maturity sizes, as well as the low density of organisms found during the present work, might be the product of high fishery pressure, habitat modifications, and pollution processes in the area, factors that have to be studied in detail in order to implement management strategies for the species
Journal
Boletín de Investigaciones Marinas y Costeras
Volume
42
Issue/Article Nr
2
Page Range
pp.215-231
URI
http://hdl.handle.net/1834/6741
Collections
SPINCAM Publications (Colombia)

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