Use oxygen-increasing medicines as advised by an official of Fishery Dept or by fishery experts.ġ1. Use lime in the pond at regular intervals.ġ0. If there is a large number of fish in the pond, a partial harvest is necessary to reduce the fish population.ĩ. Stop feeding and using fertilisers temporarily until the situation improves.Ĩ. Remove aquatic plants and vegetation from the banks to facilitate sunlight in the pond.ħ. Clean water may be splashed from the upper reaches with the help of water pumps.Ħ. Paddle a boat with oars from end to other to aerate water in a large pond.ĥ. Allow ducks to swim in the pond and splash surface water with a bamboo pole to help gather free oxygen from air.Ĥ. Pump out water from the pond (preferably from the bottom surface) and refill it with fresh water regularly by installing inlet and outlet pipes.Ĥ. The use of air supply machines (aerator) is more effective in this case.ģ. Incorporate an air supply/wind circulation system in the pond. Keep the pond free from unwanted substances and initial & periodic application of lime as a prophylactic measure is a prerequisite.Ģ. Oxygen variations may even lead to their death.ġ. Due to an imbalance in breeding-related hormones in these fishes, they face a lot of problems. Accumulation of polluted matters from outside the pond due to rainfall, inundation, or flood.īigger fishes require more oxygen. Excessive growth of aquatic plants covering the water surface or pond margin.Ħ. Production of toxic gases when fishes die and get decomposed due to excessive or poor quality of food or chemical supplements.ĥ. Unwanted accumulation of a large number of fish faeces, unconsumed fish feed, inorganic or organic fertilisers, or other organic wastes.Ĥ. High stocking density in proportion to the volume of water results in the shortage of dissolved oxygen for the biomass in a pond.ģ. Oxygen production by aquatic plants decreases when there is not enough sunlight due to cloudy weather.Ģ. The favorable dissolved oxygen level for fish culture is between 5 and 20 ppm.įew reasons for decrease or sudden depletion of oxygen in fishery pondsġ. Hence, besides feeds and fertilisers, fish farmers should also focus on measures to ensure that proper levels of dissolved oxygen are maintained. Not ensuring this could result in lower fish production and even death of fish. Maintaining optimal levels of dissolved oxygen in fisheries and ponds is crucial for favourable fish production.
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