Effects of Young Blue Swimming Crab (Portunus pelagicus) Density and Time Period in Bagging on Mortality Rate and Water Quality Changes during Transportation
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Abstract
The purpose of this study was to determine the density of young blue swimming crab in bagging on crab mortality and changes in water quality during transportation. The result showed that bagging of crab at densities of 25, 50 and 75 crabs per liter at 6 and 12 hours had lower mortality rate than at 24 hours. The change in water quality during transportation showed that some parameter of water changes at 6 and 12 hours but the change in water quality during transportation showed that some parameter of water change at 6 and 12 hours but dissolved oxygen content (2.63 ± 0.44, 1.84 ± 0.56, 1.48 ± 0.56 and 2.92 ± 0.44 mg/L) and water temperature (28.93 ± 0.46, 28.86 ± 0.40, 28.93 ± 0.47 and 28.83 ± 0.37°C) affects the mortality rate. But the salinity content of water (30.66 ± 0.57, 30.66 ± 0.57, 30.66 ± 0.57 and 30.66 ± 0.57 ppt), pH (8.62 ± 0.25, 8.57 ± 0.20, 8.46 ± 0.25 and 8.36 ± 0.30) amount ammonia (0.00 ± 0.00, 0.07 ±
0.06, 0.10 ± 0.08 and 0.15 ± 0.13 mg/L), nitrite content (0.00 ± 0.00, 0.13 ± 0.23, 0.00 ± 0.00 and 0.00 ± 0.00 mg/L) and alkalinity of water (168.33 ± 37.07, 170.66 ± 34.93, 167.00 ± 32.07 and 162.33 ± 21.38 mg/L) had no effect on the young crabs transported in sequence. On the other hand, the crab larvae transportation at 24 hours had more water changed and directly affected crab mortality in all treatments. This study indicated that density and time period of
bagging affected crab mortality and water qualities during transportation. It is suggested that the young crab should be transported at a density of 25–75 crabs per liter, and the transport time should not exceed 12 hours.
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