Key points for fishery management in the southern region in November and December

In November and December, the weather gradually turns cooler and water temperatures drop. The cultured species have grown to commercial size and meet market requirements, so fishery production should revolve around harvesting the cultured species for market and preparing for next year's production.

Centering on the harvesting of cultured species for market, fish, shrimp, crabs and soft-shelled turtles that have reached commercial size should be harvested rationally and their marketing scheduled, with part supplied to the current market and part kept for the New Year's Day, Spring Festival and next year's spring shortage period. For the fish, shrimp, crabs and soft-shelled turtles kept for the festivals and the spring shortage period, after harvesting begins in November, those meeting market size should be concentrated in holding ponds for temporary culture, with appropriate amounts of feed given regularly and the water kept fresh, to help them maintain body condition and overwinter safely, ensuring the festivals@#@136@#@; those not meeting size are kept as fingerlings for next year.

Clear the ponds and repair the pond embankments and slopes. After the fish, shrimp and crabs are harvested by draining the ponds, immediately dry the ponds and remove silt, and repair the pond embankments, slopes and the inlet and drainage systems, drying the ponds for more than 15 days. Remove excess silt from the pond bottom so that the silt is no more than 10 cm thick, to prevent excessive accumulation of organic matter from affecting next year's aquaculture production. Reinforce and compact the pond embankments and slopes and clear the inlet and drainage systems to create good environmental conditions for winter stocking.

Winter stocking. Winter stocking can create conditions for fish and shrimp fry to adapt to the culture environment early and grow early, increasing output, and all localities should actively apply it according to local conditions. After commercial fish, shrimp, crabs and soft-shelled turtles are harvested, select the main culture species and companion species according to the demand and changes in the aquatic product market, and determine the stocking size and quantity for winter stocking. For those culturing two crops of freshwater shrimp, at this time select shrimp fry of about 1600 per kilogram for stocking, at 40,000 to 50,000 per mu. Before winter stocking, repair and renovate the ponds to meet the requirements of large ponds and deep water, thoroughly clear the ponds and disinfect them, and fertilize the water. Select fish fry with strong constitutions, uniform size, no disease or injury and strong vitality for stocking, and stock enough in one go. After stocking, feed some feed in a timely and appropriate amount to ensure safe overwintering. Plant ryegrass and other forage grasses to ensure that sufficient green forage can be provided for grass carp and bream from March to April next year.

Broodstock of conventional fish should be cultured in dedicated ponds, and intensive conditioning should begin in December to make them gain weight and fat, promote gonadal development, and ensure smooth spawning next year.

It is worth noting that the warm winter phenomenon that has appeared in recent years has brought unfavorable factors to normal fishery and agricultural production, so thorough pond clearing and disinfection as well as management of overwintering ponds should be done well, and disease prevention measures should be taken early.