Acondicionamiento de reproductores y caracterización gonadal de Tawera gayi (Hupé, 1854) (Bivalva: Veneridae) bajo condiciones controladas de cultivo.
Acondicionamiento de reproductores y caracterización gonadal de Tawera gayi (Hupé, 1854) (Bivalva: Veneridae) bajo condiciones controladas de cultivo.
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Date
2015-01-11
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Keywords
Desove - Bivalvos - Acuicultura
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Abstract
El presente estudio describe el acondicionamiento de reproductores bajo sistema controlado del bivalvo Tawera gayi (Hupé, 1854), en el cual se caracterizó el estado de madurez gonadal en base a la presencia de células germinales masculinas y femeninas, estableciéndose su identificación mediante histología a través de microscopia óptica. Como metodología para el acondicionamiento se empleó una bandeja de 15,31 L de volumen útil donde fueron mantenidos 100 ejemplares de T. gayi. El sistema se mantuvo con agua de mar a 29-30 ppm con recambio de agua cada 3 días a temperatura promedio de 16 -18 °C. Con alimentación continua de una mezcla de microalgas de Isochrysis galbana y Chaetoceros muelleri. Los resultados obtenidos, ponen en manifiesto que T. gayi es una especie dioica, sin dimorfismo sexual. Presenta fecundación externa, con un ciclo reproductivo continuo, asincrónico y sin reposo gonadal. Durante las primeras semanas de aclimatación los machos presentaron 100 % de madurez máxima, mientras que las hembras demostraron un 71 % de madurez avanzada y 29% de madurez máxima. Una vez acondicionadas y con alimento continuo, se logró 100% de evacuación parcial en hembras y 50% de evacuación parcial y total en machos, obteniendo desove en cautiverio.
The present research describes the conditioning of reproductive under controlled bivalve system Tawera gayi (Hupé, 1854), this is characterized for gonad maturity of masculine and feminine cells, establishing their identity by histology. As methodology was used a tray of 15.31 L useful volume where were assembled 100 T. gayi copies. This experiment counted with seawater 29-30 ppm, this was replaced every 30 minutes, at temperature average (16-18°C), continuously feed with a mixture of microalgaes Isochrysis galbana and Chaetoceros muelleri. The results obtained, make clear that Tawera is a dioecious species, without a sexual dimorphism. It presents an extern fecundation, with a continuous reproductive cycle, not synchronized, without gonad rest. During first weeks of acclimation males presented 100 % maximum maturity, meanwhile females presented 71 % advanced maturity and 29 % maximum maturity, once conditioned and with continuous feed, was reached out 100 % of partial evacuation in females and 50 % of partial and total evacuation in males, getting spawning in captivity.
The present research describes the conditioning of reproductive under controlled bivalve system Tawera gayi (Hupé, 1854), this is characterized for gonad maturity of masculine and feminine cells, establishing their identity by histology. As methodology was used a tray of 15.31 L useful volume where were assembled 100 T. gayi copies. This experiment counted with seawater 29-30 ppm, this was replaced every 30 minutes, at temperature average (16-18°C), continuously feed with a mixture of microalgaes Isochrysis galbana and Chaetoceros muelleri. The results obtained, make clear that Tawera is a dioecious species, without a sexual dimorphism. It presents an extern fecundation, with a continuous reproductive cycle, not synchronized, without gonad rest. During first weeks of acclimation males presented 100 % maximum maturity, meanwhile females presented 71 % advanced maturity and 29 % maximum maturity, once conditioned and with continuous feed, was reached out 100 % of partial evacuation in females and 50 % of partial and total evacuation in males, getting spawning in captivity.