THE IMPACT OF ENVIRONMENTAL CONDITIONS ON REPRODUCTIVE BIOLOGY OF NILE TILAPIA

OREOCHROMIS NILOTICUS

Elsayed F. Saleem1; Mohamed El-Danasoury1;

Safaa M. Sharaf1 and Adel Akar2

1 Department of Animal Production and Fish Resources, Faculty of Agriculture, Suez Canal University, Ismailia, Egypt.

2 Department of Fish Reproduction, Central Laboratory for Aquaculture Research, Abbassa, Abo-Hammad, Sharqia, Egypt.

Corresponding author email: [email protected]

Received 1/ 1/ 2018

Accepted 28/ 1/ 2018

Abstract

This study was carried out at center laboratory for aquaculture research, Abbassa, During six months from April till September 2016.This study was designed to investigate the effect of environmental stress on reproductive performances of teleost fish, A total number of 486 healthy Nile tilapia fish Oreochromis niloticus brooders included 324 females and 162 males with an average body weight of 120.8 and 128.3 g and body length 20. 1 and 22.1 cm, of females and males, respectively. Group (1) and (2): each contain 27 hapa were used in fresh and ground water fish farms. at spawning season all fishes were randomly distributed according to three different temperature degrees T1, T2 and T3(24, 34 and 28 C°) respectively. Each treatment included nine hapas, each treatment was in triplicate stocking density were of D1, D2 and D3(2 fish/ m2, 3 fish/ m2 and 4 fish/m2),
respectively. Fecundity and egg diameter were decreased with high temperature (T2) and with high stocking density (D3). The best number of fry was observed at T3 and D2. The best values of survival rate were at T3 and D1.We concluded that using ground water in fish farms at 28° C with stocking density 3/m³ is the optimum treatment for reproduction in tilapia.