Abstract
In the present study economically important and fast growing food fishes grass carp (Ctenopharyngodon idella) and silver carp (Hypophthalmichthys molitrix) were successfully spawned with Ovatide (combination of GnRH analogue with dopamine antagonist pimozide) in Kashmir. The preparations were administered by an intramuscular injection of single dose of 0.7 and 0.8-0.9 ml/kg body weight for female grass carp and silver carp and a single dose of 0.35 and 0.4-0.45 ml/kg body wt. body wt. for male fishes respectively. After dosing, the fishes were immediately carried to breeding pools in the Chinese Hatchery. After 14-16 hours of dosing spawning took place. After 10-12 hours of spawning, twitching movement started. Hatching occurred after 20-30 hours of fertilization at 24-26°C. Fecundity of grass carp and silver carp were recorded as 70000- 80000 and 1-1.10 lac eggs/kg body wt. of fish respectively. The fertilization percentage of grass carp and silver carp were recorded as 80.03% and 78.12% respectively. The hatching percentage of grass carp and silver carp were recorded as 70.10% and 69.71% respectively. And the fry survival percentage of grass carp and silver carp were recorded as 15. 21% and 14.56% respectively. The source of water was Manasbal Lake that favored most of the water quality parameters for spawning, hatching and survival of fry than ground water.
Highlights
Among the most significant advancements in the field of aquaculture during recent times is the development of techniques to induce reproduction in fish
Results of this study showed that successful induced spawning in grass carp and silver carp were achieved by using a single dose of ovatide
Earlier studies conducted in India, Nandeesha et al [14] and Khan et al [12] have clearly demonstrated superiority of ovaprim in induced spawning of major carps.In this study both the grass carp and silver carp were successfully induced to spawn injected with single relatively high dose of ovatide (Tables 3 and 4)
Summary
Among the most significant advancements in the field of aquaculture during recent times is the development of techniques to induce reproduction in fish These techniques have allowed farmers to profitably breed and raise species that do not naturally reproduce in captivity and to manipulate the timing of reproduction to suit production cycles. Some species will not readily breed in captivity due to environmental or culture conditions that are different from those found in nature, such as water temperature or substrate type. These conditions may cause stress or may not provide the signals needed to complete the reproductive process. Human Chorionic Gonadotropin (HCG) has received some attention as a substitute for pituitary but has met with little success,except in the breeding of silver carp
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