Fish farming: Punjab vet varsity issues winter care assistance

As iciness has set in, assistance were issued to fish farmers of Punjab with a view to tackle the cold-blooded aquatic animals that want particular care right through the season.

in the advisory issued by way of the Guru Angad Dev Veterinary and Animal Sciences school (GADVASU), Ludhiana, Dr. Meera D Ansal, dean, faculty of Fisheries, of the institution, has referred to that during winters farmers may still preserve the depth of pond water up to six feet in order to deliver enough space to the fish for hibernating within the hotter backside zone. In shallow waters, the entire water column becomes bloodless, which can be fatal for the fish. regular addition of tubewell water at nightfall helps in retaining the floor water warm.

As size of the day and light-weight intensity decrease throughout winters, oxygen stages decline due to poor photosynthetic endeavor within the pond. The condition extra aggravates throughout continual cloudy days. therefore, the farmers are counseled to aerate their ponds both with the aid of including sparkling water or through the use of aerators, peculiarly during wee hours of the day.

in keeping with instructions, usual monitoring of water pH is also needed right through continuous cloudy days in winters, which may fall to risky tiers as a result of negative photosynthetic activity and due to this fact accumulation of carbon dioxide. If the water pH falls under 7.0, add lime at the price of 100kg/acre in two installments.

In case there are timber (exceptionally deciduous trees) around the pond, trim them right through winters so that direct daylight might fall over the pond and leaves don't fall into it, as they will add to the organic load and deteriorate the water first-class on decomposition. Shaded ponds are greater susceptible to oxygen depletion throughout winters.

Feed intake of fish also decreases with decrease in temperature in winters and hence, it's suggested to reduce feeding expense step by step with the aid of 25-seventy five% and forestall feeding in the month of December. extra feed remains unconsumed and accumulates at the pond bottom and deteriorates the water excellent. further, reduce or cease including biological manure like cow dung, chook droppings, pig dung and so forth. in the pond, which leads to accumulation of organic remember because of decreased microbial recreation in winters, the advisory said. protection towards predatory birds also needs special care in this season.

Presence of algal blooms is one other severe problem right through winters as they block the penetration of daylight into the water. Algal blooms seem due to the presence of extra nutrients within the water. therefore, it's also counseled to steer clear of use of inorganic fertilisers right through winters. Algal bloom may also be controlled with the aid of application of both lime on the share of fifty-a hundred kg/acre or potassium permanganate (KMnO4) on the rate of 2-3kg/acre. The farmers are informed to determine the pH of water before lime application. In case it's above 8.5, they shall not use lime.

all the way through winters, various fungal, bacterial and parasitic ailments like fin rot, gill rot, EUS and argulosis might also seem within the fish. treat the pond with CIFAX at four hundred ml/acre, potassium permanganate at 1-2 kg/acre or limestone at 50-100 kg/acre. applying salt at the cost of 50-a hundred kg/acre additionally helps in holding fish in opposition t ailment outbreak in winters.

Fish weighing above 500g shall be marketed throughout this season, in an effort to create adequate space for next crop stocking in the months of March and April.

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