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MAHMUD HASAN
Department of Fisheries, University of Dhaka, Dhaka

The effects of three confinement densities and durations on the mortality and cortisol and chloride responses of Indian major carp rui, Labeo rohita were evaluated in a simulated experiment at Jessore fish seed market in situ . No or very little mortality was found across all three densities and duration treatments. While the levels of cortisol were similar across all three densities, level was significantly (p < 0.05) different between treatment durations . Cortisol had a declining trend over the time in low and high density treatments while the level was similar among all three durations in the medium density treatment . Levels of chloride were similar between densities and durations treatments . Plasma chloride had an increasing trend across all three durations in all three densities . The results of this study suggest that although fingerlings confinement is stressful in rui, levels of mortality may be negligible in pond water

  Rui, Stress, Cortisol, Chloride, Density, Duration
  Jessore
  
  
  Variety and Species
  Carp fish

The objective of the study was to assess the level of stress by simulating the field condition in situ

Rui fingerlings (8-10 cm) were obtained from Jagorany Charaka hatchery, Jessore. Fingerlings were well conditioned for 5 days following methods practiced by the nursers. First, they were transferred from nursery to conditioning pond (40 x 30 m). After 24 h in the conditioning pond, the fingerlings were seined and confined in hapas with manual aeration (water splashing) for 30 min every morning . After 30 min of aeration, the fingerlings were released back into the conditioning pond. The fingerlings were fed wet mustard oil cake daily at 2% BW and stopped feeding 24 h before experimentation. After 1h truck transport from nursery to fish seed market at Jessore, the fingerlings were released back into the earthen holding pond for over night. The fingerlings were seined next day morning and held into hapas to accomplish the experiment. The fingerlings were confined into 9 hapas of 1 m2 at 10 (low), 20 (medium) and 30 (high density) kg m2 for 2, 4 and 6 h. This was a 32 factorial design experiment with three replicates. Confinement density and duration were the experimental variables, while mortality and plasma cortisol and chloride levels were measured from the sampled fingerlings as the level of stress experienced by the fingerlings. Mortality rate data were square root transformed before statistical analysis. The means of mortality and plasma variables were compared by ANOVA followed by Tukey's HSD post hoc for m ultiple comparisons . Statistical software SPSS version 10.0 was used to analyze the data with the levels of significance at p < 0.05 .

  Dhaka Univ. J. Biol. Sci. 17(2): 79-85, 2008 (July)
  
Funding Source:
  

The results of this study have shown that although confinement is stressful, it did not result in high mortality in rui. Rui fingerlings can be confined in hapa into pond water at 20 kg/m2 with no or little mortality for several hours.

  Journal
  


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