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ABSTRACT
In the present study attempts were made to evaluate the role of ovatide on captive breeding of Magur, Clarias batrchus in laboratory condition. Different doses of ovatide were tried on male and female fish, the optimum response was showed at dose 0.6 ml/kg body weight of female. The brooders weight range 150-300 g were used. Breeding response studied under different parameters and showed latency period (h), fecundity, fertilization and hatching (%), 14±1.2, 7000±450, 80±5.3 and 70 ± 4.5 respectively. Values are significant at (p<0.05). The present study findings indicated that ovatide @ 0.6 ml/kg body of female showed maximum spawning response in Clarias batrachus.
KEYWORDS : Spawning, Marathwada, Ovatide, Clarias batrachus, Fertilization.
The Asian catfish, Clarias batrachus popularly known as Magur is highly popular in India as an expensive table fish. This species of fish is an excellent diet source in case of patients because of easily digestible high grade protein, high concentration iron and beneficial lipid content.
The population of Clarias batrachus species is declining day by day due to drying up of wetlands, use of pesticides in the paddy field, loss of habitat and overfishing particularly in Marathwada region (Jagtap and Kulkarni; 2013). Due to non-availability of quantity and quality seeds from wild and natural source and also scarcity of matured brood fish which is the major constraint in the culture of this species in a large scale level in this region. To overcome this problem seed production and culture as well in pond environment through induced breeding.
The use of synthetic inducing agents for successful ovulation followed by stripping in catfish is a common practice and has been studied at several occasions (Manickam and Joy; 1989).
However, the commercially available synthetic inducing hormones in readymade form containing GnRH and dopamine blocker receptor (Ovaprim, Ovopel, Dagin and Aquaspawn) are becoming very popular and found to be efficient in successful spawning of fishes (Nandeesha et al., 1990). Ovatide, an injectable inducing hormone consisting of GnRH analogue in combination with dopamine antagonist, is also efficient in induced spawning (Sahoo etal.,2004).
The aim of the present study was to test the effectiveness of different doses of Ovatide in induced spawning of Clarias batrachus in Marathwada region.
MATERIALS AND METHODS
The induced breeding experiments...