Temperatura óptima y preferencia térmica del camarón de rí­­o Macrobrachium tenellum en la costa tropical del Pací­­fico mexicano

Abstract

 The objective was to determine the optimal temperature, thermal preference and maximum incipient lethal temperature (TLImax) and minimum (TLImin) for juveniles of 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 are 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 were 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 of 50% of the 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 were: to 21°C, 42 and 8.1°C; to 29°C, 43.2 and 10.2°C; and to 36°C, 43.5 and 11.1°C, respectively.