Abundancia Y Madurez Sexual De Anadara Similis en El Manglar De Luisico, Bahía Málaga, Pacífico Colombiano

Abstract

The abundance and sexual maturity of piangua Anadara similis in La Plata Archipelago, Bahía Málaga, Pacific coast of Colombia, was analyzed between September 2009 and August 2010. 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/m2 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/m2) and August (0.195 ind/m2). 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 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.

Gonadal development and sexuality of Larkinia grandis (Arcida: Arcidae) inhabiting southeastern Gulf of California

“…The criteria to define sexuality need to be improved and clarified. In this work, the shape and position of the gonads of L. grandis at the different gonadal phases are similar to those reported by Pérez-Medina (2005) and García-Domínguez et al (2008) for A. tuberculosa, and by Manjarrés-Villamil et al (2013) for A. similis. The gonad, regardless of sex, was located along the digestive gland.…”

“…difference is that the present work gives more detailed descriptions and uses slightly different nomenclature (Table 2). Additionally, the findings of this work are consistent with the descriptions of the gonadal phases of other species of Arcidae such as A. tuberculosa (Cruz 1984, Pérez-Medina 2005, García-Domínguez et al 2008, A. antiquata and A. granosa (Jahangir et al 2014), A. similis (Manjarrés-Villamil et al 2013) and A. noae (Ghribi et al 2017). It is important to note that there are different classifications of the gonadal phases even for the same species (Table 2), mainly due to the criteria applied by each researcher.…”

“…Also, brown cells have been observed in the acini of ripe and partially spawned gonads of A. noae (Ghribi et al 2017), in ripe and spawning gonads of A. tuberculosa (Lucero-Rincón et al 2013) and in spawning and post-spawning gonads of A. similis (Manjarrés-Villamil et al 2013). These cells were named as brown secretion granules in A. tuberculosa and A. similis (Lucero-Rincón et al 2013, Manjarrés-Villamil et al 2013. In mollusks, brown cells (also known as rhogocytes) are characterized by phagocytosis (endocytosis), role in metal ion metabolism, transport or storage of nutrients, synthesis or breakdown of respiratory pigments, supportive cell, selective reabsorption, and others (reviewed by Haszprunar 1996).…”

“…During the post-spawning phase and the onset of the resting phase of L. grandis (sub-phase 1), the presence of brown cells was noticeable, and their amount was reduced towards the end of the resting phase (sub-phases 2 and 3). Also, brown cells have been observed in the acini of ripe and partially spawned gonads of A. noae (Ghribi et al 2017), in ripe and spawning gonads of A. tuberculosa (Lucero-Rincón et al 2013) and in spawning and post-spawning gonads of A. similis (Manjarrés-Villamil et al 2013). These cells were named as brown secretion granules in A. tuberculosa and A. similis (Lucero-Rincón et al 2013, Manjarrés-Villamil et al 2013.…”

Aspectos biométricos y reproductivos de Anadara tuberculosa (Sowerby, 1833) (Bivalvia: Arcidae) en dos sitios de extracción de Esmeraldas y El Oro, Ecuador, durante el último trimestre de 2016

“…En la zona norte de Esmeraldas y archipiélago de Jambelí durante diciembre se observaron valores altos (88% y 90%) para el estadio desove, respectivamente. Estos resultados fueron similares a los obtenidos en Manjarrés-Villamil et al (2013) para A. tuberculosa al reportar mayor actividad de desoves en el segundo semestre del año y una importante actividad en noviembre lo que coincide con García-Domínguez et al (2008) con la diferencia de una máxima frecuencia de emisión de gametos en noviembre (71.4%) en bahía Magdalena, México. Mora et al 2010) también se presentan valores altos para el estadio desove entre los meses septiembre a diciembre, su valor máximo lo alcanza en diciembre con (65.71%) en la zona norte de Esmeraldas.…”