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Effect of Different Salinity Level on Breeding, Fertilization, Hatching and Survival of Nile Tilapia, Oreochromis niloticus (Linnaeus, 1758) in Captivity

Effect of Different Salinity Level on Breeding, Fertilization, Hatching and Survival of Nile Tilapia, Oreochromis niloticus (Linnaeus, 1758) in Captivity

Abdul Malik1,2, Ghulam Abbas1,*, Abdul Ghaffar3, Sara Ferrando4, Lorenzo Gallus4 and Syed Sajjad A. Shah2,3

1Centre of Excellence in Marine Biology, University of Karachi, Karachi
2 Livestock and Fisheries Department, Directorate of Fisheries Sindh, Karachi
3Department of Life Sciences, The Islamia University of Bahawalpur, Bahawalpur, 
4Department of Earth, Environment and Life Sciences, University of Genoa, Italy

*      Corresponding author: ghulamabbas@uok.edu.pk

 

Fig. 1.

Regression of salinity on fecundity (A), fertility (B), hatchability (C) and fry (D) of Nile tilapia (Oreochromis niloticus) among all treatments.

Fig. 2.

Egg to juvenile development stages of Nile tilapia: fertilized egg yellow in color at the first day (A, B) than yellow brown and yolky; at second day small dark spots are appeared on the egg surface (C); from third day and fourth day eyes and hair-like tail appeared (D & E); at the fifth day head appeared (F); from fifth day to sixth day head and tail further more developed, yolk sac decreased and the embryo started slight movement (G); on ninth day to twelfth day post-yolk sac appeared at this stage yolk sac was completely absorbed and fry started to feed on artificial diet (H). On thirteenth day to fifteenth day fins and other body parts are developed completely and reached about 0.5 g in weight (I). Finally reached 1-2 g in weight and look like parent after twenty third day to twenty-eighth day (J).

Fig. 3.

Water quality parameters recorded during the experimental period. A, temperature; B, dissolve oxygen; C, pH; D, ammonia on different salinity levels.

Fertilization
Hatchability
Unfertile eggs
Survival
Egg body

Pakistan Journal of Zoology

June

Vol. 50, Iss. 3, Pages 799-1198

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