Salinity tolerance level of GIFU tilapia strain (Oreochromis niloticus) at juvenile stage

Abstract


Monjurul Hasan, Bhakta Supratim Sarker, K. M. Shahriar Nazrul and Umma Salma Tonny

An experiment was conducted to determine the salinity tolerance level at juvenile stage of Nile tilapia strain, GIFU. Juveniles of GIFU tilapia were subjected to five salinity levels for a period of 24 days. A total of 150 hatched fry of GIFU tilapia with initial individual weight of 0.013 g were stocked in 5 jars of 10 liter capacity for the experiment. Feed were given at a rate of 13% of total body weight per day containing 40% crude protein. Room and water temperature was maintained at 30 ± 2°C and 28±2°C respectively. Water was exchanged at the rate of 30% per day. At the end of experiment result showed that both growth and survival rate of fry were recorded highest at 0ppt salinity and lowest at 15ppt salinity respectively. Both growth and survival rate at 5ppt salinity was found better than 10ppt and 15ppt salinity. This finding suggests that juveniles of GIFU tilapia strain could survive well up to 5ppt salinity. Temperature was not found to be a significant factor either on survival rate or growth performance. The obtained results clearly indicate that, GIFU tilapia has lower ability to higher salinity tolerance at juvenile stage.

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