EFFECT OF SOME ENGINEERING PARAMETERS AFFECTING ON EGGS INCUBATION OF GRASS CARP (Ctenopharyngodon idella)

Radwan M.E¹ and Adel F.E. ²

¹Aquaculture department. ²Hatchery and physiology department.

Central Agriculture Research, Central Laboratory For Aquaculture Research, Abbassa, Sharkia, Egypt.

ABSTRACT

Present study was conducted to induced on breeding of commercially important grass carp (Ctenopharyngodon idella)
due to the non-availability of its quality seeds from the natural resources for environmental degradation. The aim of the study was to achieve success in fertilization and hatching using various incubator with the grass carp (Zugar and Poultry drinker), to investigate the effect of three water flow rate about (77, 155, 233) ml/min for 1 liter volume of water and three number of eggs density (75,150, 225 eggs per liter) on hatching percentage and fry production of water with mentor water quality (pH, Oxygen and Temperature) during incubation period every 2 hours until inducing hatch. The obtained results revealed that the hatching ratio in Zugar in water flow rate (77, 155, 233 ml/min) were 65% at 75 eggs/liter, 68 % at 150 eggs/liter, and 70 % at 225 eggs/L respectively. On the other hand, hatching ratio in the Poultry drinker in water flow rate (77, 155, 233 ml/min) were 61 % at 75 eggs/liter, 60 % at 150 eggs/L, and 58 % at 225 eggs/L, respectively.

Fry production in Zugar in three different water flow rate (77, 155, 233 ml/min) were 0.44 fry/L at 75 eggs/L, 0.91 fry/L at 150 eggs/L, and 1.41 fry/L at 225 eggs/L, respectively. While, fry production in water flow rate (77, 155, 233 ml/min) in Poultry Drinker were 0.41 fry/L at 75 eggs/L, 0.8 fry/L at 150 eggs/L, and 1.17 fry/L at 225 eggs/L, respectively. The main value of pH was 7.1, the value of dissolved oxygen concentration was 5.4 mg/l, and the Degree of temperature is 22.4^oC.