further trials on induced
breeding of pangasius pangasius (hamilton) in bangladesh
M.H.K. Khan, M.F.A. Mollah-2004
Asian Fisheries Science, 17(1-2): 135-146
Abstract:
The endangered riverine catfish, locally known as
Pangas (Pangasius pangasius Hamilton; Pangasiidae), is a very
important catfish of Bangladesh. Though it is also distributed in India,
Myanmar and Pakistan, the induced breeding technique of the species has not
been established. To save this fish from extinction, the experiment was
conducted with 23 broods of P. pangasius (10 females and 13 males)
weighing 4.2 kg on an average to establish a suitable breeding technique.
Three breeding trials were conducted. Four different doses viz. 9, 10, 11,
and 12 mg/kg body weight of acetone dried carp pituitary gland (PG) were
tested. Though all the four doses resulted in 100% ovulation in females, the
dose of 10 mg/kg body weight of PG demonstrated the best result in
consideraton to fertilization and hatching rates of eggs. Hatching of
fertilized eggs occurred between 28 and 32 hours of incubation at 26 to 28°C.
Hatching rate was highest (65%) in the second trial. Newly hatched larvae
were planktonic and transparent. Feeding of larvae started between the third
and fourth days after hatching. A number of larvae died at the free swimming
stage and many died at the first feeding stage. The majority died within 10
days of hatching. Only 3 larvae survived after 10 days out of the thousands
that hatched. These larvae preferred tubificid worms.
(Fish Seed Multiplication Farm, Chauddagram, Comilla,
Bangladesh)