Written Paper

Salinity tolerance of Rohu (Labeo rohita) and its hybrid under differenttemperature regimes  [2004]

Mateen, A. Afzal, M. Ahmed, I. Hafeez-ur-Rehman, M.,University ofAgriculture, Faisalabad (Pakistan). Dept. of Zoology and Fisheries

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An experiment was carried out at Fisheries Research Farms, University ofAgriculture, Faisalabad, in order to find out tolerance of Rohu (Labeo rohita) andits Hybrid (Labeo rohita male x Catla catla female) for different levels of salinityunder temperature gradients. The salinity levels were prepared on the basis ofelectrical conductivity (E.C.), by adding commercial grade NaCl in the water. Thefive experimented EC levels were 1.2 mS/cm for control, 5, 10, 15 and 20 mS/cmfor treatment T1-T4, respectively. The selected temperature gradients were 14, 21and 28 degree C. The 7-days LC-50 values for rohu were remained as 17.383,19.649 and 10.158 mS/cm at temperature 14, 21 and 28 degree C, respectively,while the 7-days LC-50 values for its hybrid remained as 20.465, 11.640 and 8.352mS/cm at temperature 14, 21 and 28 degree C, respectively. Hybrid showedsusceptibility towards salinity as the temperature rises. Rohu proved to be moreresistant against salinity at high temperature than low temperatures. Theimportant physico-chemical parameters varied significantly but remained favorableduring the whole period of study.

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International Journal of Agriculture and Biology (Pakistan)

ISSN : 1560-8530