Induced Spawning of Pangasius sutchi with Pituitary Extract

Under normal condition Pangasius sutchi becomes sexually mature during the second year of their life. There was not any recorded evidence for their natural breeding in Sri Lanka. Therefore induced spawning of Pangasius sutchi were used by inoculation of pituitary extraction. Pituitary extract of Tilapia will use as the agent for induced spawning. Thus pituitary glands of tilapia should be removed and pituitary extraction will be prepared

Induced breeding is a technique of fish breeding in confined water, stimulated by artificial hormone administration which is gonadotropin. There were various spawning agents. But in this case pituitary extract of tilapia have been used to inducing spawning of Pangasius sutchi.

Main objective of this research is artificial breeding of fish species which they have not bred in natural conditions of Sri Lanka. This technique can be used for the species in fresh water and marine water.

Economically demanded fish species (Not bred naturally in Sri Lanka) are imported and therefore ornamental fish owners should have to incur large fund of money to buy these species. If this technology successful, they have to pay a small amount of money because there is no need to import them and can be minimized the cost. In addition to that those fishes will be exported.

 

Pangasius sutchi is a large fresh water cat fish and they are popular and commercially valuable   ornamental fish.

 It has not been recorded that they breed successful in captivity of Sri Lanka.

A gravid female have a bulging belly which is swollen and soft while the urogenital oval shape is reddish in color which is much bigger than the male. The release of yellow eggs is eminent when abdomen is pressed or when holds at the caudal and fold its body above water. While the male have a slender body and belly is not swollen. The urogenital-oval shape is narrow and smaller than the female and when the belly is pressed, it releases white milt.

Males and females are easily distinguished particularly around April. Egg-bearing females are identified by their big, soft and distended belly with swollen and reddish pink vent.Males could easily be identified by their reddish genital opening and releasing of milt, when the abdomen is pressed.