Effect of Salinity on the Survival and Growth of Rufiji Tilapia (Oreochromis urolepis urolepis) Fry

  • Eusebia E. Ulotu Tanzania Fisheries Research Institute
  • Aviti John Mmochi Institute of Marine Sciences, University of Dar es Salaam
  • Hieromin A. Lamtane Animal Science and Production Department, Sokoine University of Agriculture.
Keywords: Oreochromis urolepis, growth, survival rate, salinity tolerance.

Abstract

Abstract

Survival and growth of Rufiji tilapia (Oreochromis urolepis urolepis) fry were determined under controlled salinity conditions of 5, 15, 25 and 35 ppt for 56 days. Experiments were carried out in 12 concrete tanks of 1 m3 volume each with three replicates for each treatment. Data was recorded at fourteen days intervals where weight measurements (g) of fry were recorded to the nearest 0.01 g. One Way Analysis of Variance (ANOVA) was used for data analysis. Results showed significant differences in the final body weight, specific growth rate, weight gain and daily growth rate at different salinity levels. The fry reared at a salinity of 25 ppt had the highest final body weight, specific growth rate, weight gain and daily growth rate, while the lowest was recorded at the salinity of 5 ppt. There was no significant difference in survival rate among the fry reared at different salinity levels. Dissolved oxygen (DO) was significantly different at different levels of salinity but temperature and pH showed no significant differences. The results suggest that under proper management, Rufiji tilapia can be farmed in brackish and sea water by coastal communities along the coast. 

Author Biographies

Eusebia E. Ulotu, Tanzania Fisheries Research Institute
Eusebia Ulotu, Aquaculture Speciealist, Fisheries Research Institute
Aviti John Mmochi, Institute of Marine Sciences, University of Dar es Salaam
Senior Lecturer, Marine Environmental Chemisty and Mariculture, Institute of Marine Sciences, University of Dar es Salaam
Hieromin A. Lamtane, Animal Science and Production Department, Sokoine University of Agriculture.
Hieromin Lamtane, Agricultural Economics, Aquaculture, Sokoine University of Agriculture, Animal Science and Production Department
Published
2017-03-24
Section
Articles

Journal Identifiers


eISSN: 0856-860X
print ISSN: 0856-860X