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.
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| Breeding hapa in polyhouse, FRC, AAU |
The resultant seedlings were raised in
the pond itself by installing cloth hapa under the same condition with
provision for shower for maintaining the dissolved oxygen content.
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| Seed raising under polyhouse condition |
Comparative
study revealed that the spawn raised in pond within the polyhouse yield better
results in terms of growth and survival than trial under normal condition in
earthen ponds. This innovative technology developed and standardized by Dr.
Bibha Chetia Borah and Dr. Ranjita Bania of Fisheries Research Centre, AAU will
help the fish seed producers and growers of the entire North East Region for
breeding and production of quality fish seed during winter months in advance of
actual breeding season (May-June).
Very interesting, thanks for sharing the detail. What is done with the feces which is extracted from the tanks? How is it filtered and what are the issues associated with raising the same species of fish in a confined tank such as this? This has to be a breeding ground for pathogenicity associated with the species due to such confinement.
ReplyDeleteHow about the actual quality of the meat? Is the meat nutrient dense or no? Just curious. Aren't fish raised in this particular setting fed a consistent daily ration of the same types of food without any dietary diversity?
Just thinking if this really is as beneficial to people as our universities are leading us to believe.