Water quality Management of Shrimp Propagation and shelling in Autumn River Shrimp with good autumn management and high benefit

The autumn management of shrimp ponds is particularly important for commercial shrimp culture. grasping the autumn management of shrimp ponds can improve the commodity rate of green shrimp, improve the specifications of commercial shrimp and increase the benefit of shrimp culture.

Green shrimp culture

First, control the autumn propagation of shrimp seedlings. Controlling the autumn propagation of shrimp seedlings can improve the commodity rate of green shrimp. The green shrimp grows fast. The young shrimp hatched in late June can reach more than 3.5cm in body length after 50-60 days of rearing, and mature sexually in August. How to control the autumn propagation of shrimp seedlings? The transparency of pond water should be above 35cm, the water quality should be lean, and the yellowish green is better. In this way, the survival rate of autumn shrimp seedlings is greatly reduced because there is no sufficient plankton as bait.

Second, manage the water quality of shrimp ponds. Keep the high water level in the shrimp pond in autumn and change the water in time according to the color and transparency of the pond. If the pond water is too fat, first discharge part of the "old water" and then add new water, the water is filtered with a double-layer 60-mesh sieve silk to prevent miscellaneous fish from mixing, each time the amount of water is about 25-30cm, do not pour the old water into the shrimp pond as far as possible, otherwise it is easy to float. If there are more wild miscellaneous fish in the shrimp pond, you can sprinkle shrimp and crab protective agent to kill it. In the process of breeding, due to feeding and fertilization, the pond water is easy to become fertile and thickened, so the acidity and alkalinity of the pond water should be often measured and adjusted in time, and quicklime should be sprinkled once a month, depending on the acidity and alkalinity of the pond water, the depth of the pond water is 1 meter per mu, and the dosage of quicklime is 10-15 kilograms. It plays a significant role in disease prevention and growth. In addition, the mixed culture of filter-feeding and a small amount of herbivorous fish in shrimp ponds can control the excessive growth of algae, keep the water quality fresh and create a good environment for shrimp culture. If there is heavy rain before evening, it is very easy to lack oxygen in the early morning of the next day, so we should take precautions in time.

Third, strengthen shelling management. The freshly shelled soft-shelled shrimp is weak in activity and unable to resist enemy attacks. therefore, in addition to creating a good environment for green shrimp and providing it with a hidden place, we should also avoid a large number of deaths caused by massive flushing during the shelling period of green shrimp. At the same time, we should ensure that the feed is sufficient or add shelling element to the bait to make it shelled smoothly and avoid killing each other of the same kind.

Fourth, timely control of green mud moss. If a large amount of moss is found in the shrimp pond, the following methods can be used:

⑴ water change: repeatedly enter and drain water, each time 20-30cm, discharge the same amount of bottom water, reduce the content of organic matter.

⑵ sunbathing beach: lower the water level appropriately on a sunny day and let the algae attached to the beach die.

At noon on a sunny day, plant ash was scattered at the downwind of the pond to block the photosynthesis of the algae.