During summers, fish farmers need to be more sensitive towards their business, say experts from Guru Angad Dev Veterinary and Animal Sciences University (GADVASU). Without proper knowledge, farmers may even fail to reap proper benefits out of this, they underlined.
“First of all, provide sufficient comfortable zone to your fish below the surface layer, which gets heated up far beyond optimum temperature range (28-320C). Maintain six feet water depth and to mitigate heating up of water; partial shading of pond with trees is also recommended.
Further, take care of the water quality. Oxygen is the most important issue to be addressed, which may fall to lethal levels, especially during dawn, due to enhanced biological activity in the pond. Hence, aerate the ponds during early hours of the day before sunrise, either by adding fresh water or by aerators.
High oxygen content will keep the fish healthy and increase its food converting efficiency,” shared Meera D Ansal, a professor from the college of fisheries.
Interestingly, she shared that fish pond water, which is full of nutrients as fish release their waste, should also be released in the agricultural fields to enrich the soil, added Ansal.
Farmers also need to check diurnal variation in water pH, which may cross 9.5 during peak day hours and fall below 7.5 during night hours, due to excessive growth of algal blooms in the pond. Algae also grow very fast during summers and nutrient enrichment leads to formation of algal blooms.
Manuring and fertilisation of pond shall be suspended in case water turns dark green, dark brown or greenish brown in colour and a green, brown or sometimes red coloured algal mat appears on the water surface, shared Asha Dhawan, dean college of fisheries.
It is also very important to sustain regular plankton (natural fish food) production in the pond and provide a nutritionally balanced supplementary diet.
Keep the pond rich in plankton through mixed utilisation of organic manures and inorganic fertilisers. Suspend feeding in case fish come to the surface for gasping atmospheric air or some kind of disease is observed in the fish, added Dhawan.
Public Relations Officer Harpreet Singh said, GADVASU regularly provides trainings to fish farmers and wants to cover as many fish farmers as possible.