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Rearing of juvenile dark crabs, Callinectes rathbunae contreras, 1930, under laboratory conditions

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In the present study, we reared juvenile dark crabs, Callinectes rathbunae under laboratory conditions. We determined growth rate, increase in carapace width, moult consumption, regeneration of appendages, and survival. The crabs were collected in March 2004 from the Alvarado Lagoon System in the state of Veracruz, Mexico. Crabs were transported to the laboratory and acclimated to 5 and 15 psu and a temperature of 25 ± 1° C. Growth rate was determined by the difference in size at the time interval between the pre-moult and moult stages. Survival was assessed by counting the juvenile crabs during rearing, moult consumption was determined after 24 hours, and regeneration of appendages at the next moult. The size of juveniles ranged from 1.7 to 6.4 cm. Results revealed that carapace increase was greater at 15 psu, being 35.29% for the 1.7-2.8 cm size range. The mean growth rate at 5 psu was 0.33 ± 0.07 mm/day and 0.76 ± 0.12 mm/day at 15 psu. Moult consumption was 50%. A 100% regeneration of appendages was observed after moulting. Survival was best at 15 psu, with 78.31%. En el presente estudio se realizó el cultivo de cangrejos juveniles de Callinectes rathbunae en condiciones de laboratorio. Se determinó la tasa de crecimiento, el incremento en el ancho del caparazón, el consumo de la muda, la regeneración de apéndices y la sobrevivencia. La colecta se realizó en Marzo de 2004 en el Sistema lagunar de Alvarado, Veracruz, México. Los cangrejos fueron transportados al laboratorio y aclimatados a 5 y 15 ups y temperatura de 25 ± 1°C. La tasa de crecimiento se determinó por la diferencia de talla y el intervalo de tiempo transcurrido entre la premuda y la postmuda, la sobrevivencia por el conteo de cangrejos juveniles durante el tiempo de cultivo, el consumo de la muda después de 24 h y la regeneración de los apéndices a la siguiente muda. El intervalo de talla de los juveniles fue de 1,7 a 6,4 cm. Los resultados mostraron que el incremento en el ancho del caparazón fue mayor en una salinidad de 15 ups con el 35. 29% en el intervalo de talla de 1,7 a 2,8 cm. Las tasa de crecimiento promedio a 5 ups fue de 0,33 ± 0,07 mm/día y a 15 ups fue de 0,76 ± 0,12 mm/ día. El consumo de muda fue del 50%. Se observó un 100% de regeneración de apéndices después de la muda. El porcentaje de sobrevivencia fue mayor a 15 ups con el 78,31%.

Affiliations: 1: Laboratorio de Ecología de Crustáceos, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Apartado Postal 314, Tlalnepantla, Estado de México, C.P. 54090, Mexico; 2: Laboratorio de Ecología de Crustáceos, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Apartado Postal 314, Tlalnepantla, Estado de México, C.P. 54090, Mexico


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