Veterinarski arhiv, Vol. 69 No. 1, 1999.
Izvorni znanstveni članak
Non-stripping induced spawning and double spawning of grass carp in a hatchery system with foliage-free brood diet.
Suresh Chandra Rath
; Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar, India
Satya Dev Gupta
; Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar, India
Subrata Dasgupta
; Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar, India
Sažetak
Grass carp, (Ctenopharyngodon idella (Val.)) could be induced-bred without stripping, by brood diet manipulation and improved hatchery management practices. Broods reared on a foliage-free formulated diet (soybean cake, groundnut oil cake, rice bran and fish meal) were induced-bred and compared with the breeding response of the same carp, fed with aquatic submerged weed, (Hydrilla verticillata) ad libitum. The non-stripping breeding response on the non-foliage diet (NFD) group was 82.2% and over 20.0% response of the brood reared in foliage diet (FD). Average fecundity, percentage of fertilisation, and spawn recovery rate of NFD group were recorded as 0.90±0.15×105 vs. 0.47±0.13×105; 89.6±5.33 vs. 68.75±23.1 and 0.76±0.13×105 vs. 0.25±0.08×105 respectively. Broods of the NFD group could be bred twice and produced spawn at 0.45±0.11×105 per kg body mass within a time gap of 70 days between two successive breedings. Non-stripping induced breeding of grass carp is facilitated with mild water current (2-3 m per sec.) and less water depth (0.5-0.6 m) in a single inlet spawning pool.
Ključne riječi
grass carp; Ctenpharyngodon idella (Val.); non-foliage diet; foliage diet; Hydrilla verticillata; non-stripping spawning; double breeding
Hrčak ID:
104933
URI
Datum izdavanja:
21.2.1999.
Posjeta: 826 *