Article
Optimum temperature and thermal preference of the river shrimp Macrobrachium tenellum in the tropical coast of the Mexican Pacific [Temperatura óptima y preferencia térmica del camarón de río Macrobrachium tenellum en la costa tropical del Pacífico Mexicano]
Fecha
2012Autor
Rodriguez Flores, R.
Lazareno Morfin, M.
Espinosa Chaurand, L.D.
Basto Rosales, M.E.R.
Vega Villasante, F.
Institución
Resumen
The objective was to determine the optimal temperature, thermal preference and maximum incipient lethal temperature (TLImax) and minimum (TLImin) for juveniles prawn Macrobrachium tenellum under laboratory conditions using the acute method. The determination of the optimum temperature was made based on the results of growth and survival of juvenile M. tenellum (0.17 ± 0.02 g and 28.56 ± 1.60 mm) maintained at three temperatures (22, 29 and 36°C) for 15 days, in triplicate. The thermal preference was determined in a thermal gradient table with temperatures adjusted to 20, 23, 25, 27, 30, 33, 35 and 39°C, using the acute method, in which 10 juveniles were introduced (0.38 ± 0.21 g and 40.38 ± 10.33 mm) and acclimated for 72 h at 23, 30 and 32°C, recording the percentage of occurrence per camera every 10 min for three hours (in triplicate). The TLImin and TLImax was estimated at 10 organisms (0.50 ± 0.20 g and 39.65 ± 0.72 mm) acclimated for 72 h at 21, 29 and 36°C by increasing or decreasing the water temperature until the death 50% of population. The highest growths in organisms were obtained at 29°C (optimum temperature). The final preferred temperature was 32.25°C, while TLImin and TLImax to 21°C were 42 and 8.1°C; to 29°C, of 43.2 and 10.2°C; and to 36°C, of 43.5 and 11.1°C, respectively.