Algal bloom can be controlled by application of either lime 50-100 kg/acre or potassium permanganate (KMnO 4) 2-3kg/acre. Under such condition, it is recommended not to add any inorganic fertilizer in the pond. Presence of algal blooms is another serious problem during winters as they block sunlight penetration in to the water column.
Protection against predatory birds is also important in this season to prevent stock loss. Excess feed remains unconsumed and accumulates at the pond bottom and deteriorates the water quality.Īlso reduce/stop fertilizing the ponds with organic manures, which leads to unwanted accumulation of organic matter owing to reduced microbial activity. Further, shaded ponds are more susceptible to oxygen depletion during winters.Īs feed intake of fish also decreases during winters, feeding must be reduced gradually by 25 to 75% and finally stopped in December. The trees around the pond should be trimmed so that direct sunlight can fall over the pond and leaves do not fall in to it, which otherwise adds to the organic load and deteriorate the water quality. If the water pH falls below 7.0, add lime 100kg/acre in two installments. Regular monitoring of water pH is vital during continuous cloudy days, which may fall to harmful levels due to poor photosynthetic activity and subsequent accumulation of carbon dioxide. Therefore, the farmers must aerate the ponds either by adding fresh water or by using aerators, especially during early hours of the day. The situation further aggravates during continuous cloudy days.
Regular addition of tube well water at dusk helps in keeping the surface water warm during nights.Īs day length and light intensity decreases during winters, oxygen level in the pond also declines due to poor photosynthetic activity.
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How to take care of fish & pond in wintersīelow we have given few tips for those involved in fish farming