EFFECT OF SALINITY ON GROWTH AND SURVIVALITY OF LABEO ROHITA IN CAPTIVITY

Manas Mohan Baliarsingh; Jaya Krushna Panigrahi; Ajay Kumar Patra

Volume : VII, Issue : IV, April - 2018

EFFECT OF SALINITY ON GROWTH AND SURVIVALITY OF LABEO ROHITA IN CAPTIVITY

Manas Mohan Baliarsingh, Jaya Krushna Panigrahi, Ajay Kumar Patra

Abstract :

Present experiment was conducted to study comparative growth performances of rohu, Labeo rohita(Cypriniformes: Cyprinidae) juveniles in different salinity conditions including freshwater systems. Six uniform–sized (80 L capacity) rectangular glass aquaria (experimental tanks) were used for the purpose. Salinity in experimental unitswas maintained from0 to 6.5 pptby mixing desired saline water with freshwater from deep bore–well. In total, 300rohu juveniles were purchased from a private hatchery, stocked in a cemented tank (CT)filled with freshwater after giving a dip bath in 0.5% KMNO₄ as a quarantine measure. After completion of 24 hours of stocking, saline water was added in the CT to raise the salinity up to 0.5 ppt and the juveniles were kept there for another 24 hours. Subsequently, juveniles were transferred to experimental tanks and each was stocked with 40 specimens. Every alternate day, salinity of the tanks was recorded and adjustment was made by adding fresh/ saline waters as per the requirement. After completion of 20 days and 40 days of re�, body weights were recorded. All the results were compared. The finding of the study reveals that normal growth was observed in salinity level 0 to 3.8 ppt, and was significantly affected in higher salinity. Therefore, it is resulted from the study that rohujuveniles can adopt gradual increase in water salinity at < 4 ppt and also perform well in their growth.