TECHNOLOGY INNOVATION FOR ADVANCED BREEDING AND SEED RAISING UNDER POLYHOUSE CONDITION 

              The innovative advanced breeding technology of indigenous minor carps viz. Labeo gonius and Labeo calbasu under polyhouse condition has been developed in Fisheries Research Centre, Assam Agricultural University under the research project on ‘Advance breeding of carps through enhancement of environmental temperature using UV stabilized LDPE film’ (RKVY). The technology involves raising and maintaining average water temperature within the range of 24.82-27.10 (in pond under polyhouse) in winter months i.e. December to March through warm water recycling using the specially designed heating system through which the pond water is recycled and put back to the pond after filtration and heating. The system of warm water recycling has been standardized so as to maintain the water temperature within optimum range for gonadal development throughout the period by manipulating the temperature of the inflowing water in relation to existing volume as well as temperature of water retained in the pond. The photoperiod was also increased up to 2.5hr through fluorescent lights installed.

The breeding was conducted in two system viz. portable hatchery and hapa installed in the polyhouse and in polyhouse pond respectively. The portable hatchery was run by using warm water of the pond recycled with predetermined temperature range. A unidirectional flow was maintained during breeding in hapa installed in the pond under polyhouse along with showering provisions to create artificial riverine condition. Two indigenous minor carps viz. Labeo calbasu and Labeo gonius were successfully bred during the month of February, 2014 in both hatchery and hapa systems.

Breeding  hapa in polyhouse, FRC, AAU