Original scientific paper

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

Abstract

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.

Keywords

grass carp; Ctenpharyngodon idella (Val.); non-foliage diet; foliage diet; Hydrilla verticillata; non-stripping spawning; double breeding

Hrčak ID:

104933

URI

https://hrcak.srce.hr/104933

Publication date:

21.2.1999.

Article data in other languages: croatian

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