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Optimum Salinity Level for Seed Production and Survival of Red Tilapia (Hybrid) in Concrete Tanks

Optimum Salinity Level for Seed Production and Survival of Red Tilapia (Hybrid) in Concrete Tanks

Abdul Malik1,4, Ghulam Abbas1*, Hameeda Kalhoro2, Illahi Bux Kalhoro3, Syed Sajjad A. Shah4 and Halima Kalhoro3 

1Centre of Excellence in Marine Biology, University of Karachi, Karachi, Pakistan
2Department of Fresh Water Biology and Fisheries, University of Sindh, Jamshoro, Pakistan
3Department of Anatomy and Histology, Faculty of Animal Husbandry and Veterinary Science, Sindh Agriculture University, Tando Jam, Pakistan
4Directorate of Fisheries Sindh, Livestock and Fisheries Department, Govt. of Sindh, Pakistan

*      Corresponding author: ghulamabbas@uok.edu.pk

ABSTRACT

This study was conducted to examine the effects of varying salinity levels (0‰-30‰ with 5% increment) on breeding of red tilapia. Brood fish were stocked in hapa nets suspended in cemented rectangular tanks (11×7×4 feet) . Three females (mean weight 145 g) and one male (140 g) were kept per tank with 2 replications. They were fed with commercial floating pellets having 35% crude protein at 2% body weight twice a day for 60 days and eggs were collected weekly. Results showed that fertilized eggs were found to be greater in number at low salinity level as compared to higher salinity level. Survival of fry ranged from 1058 to 1100 at salinity level of 0‰ – 20‰ with 5% increment, after which fry number decreased significantly (P<0.05). The fertilized eggs did not differ for the fish at salinity of 0‰ –20‰, but decreased significantly when salinity levels were increased above 25‰. Water quality parameters remained as temperature (28.1±0.2°C), dissolved oxygen (6.10±0.1 ml/l), pH (6.6±0.1 ml/l) and ammonia (0.02±0.004 ml/l) throughout the study period. Taking into consideration the number of fertilized eggs and survival of fry data attained in the present study, a salinity level of 20% is suggested for red tilapia breeding in concrete tanks.
 

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Pakistan Journal of Zoology

June

Vol. 53, Iss. 3, Pages 801-1200

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