Severe cold weather and harmful cold weather that has lasted for the past few days has caused the temperature in Quang Tri to drop sharply, severely affecting people’s aquaculture activities. Currently, households are actively implementing measures to protect farmed aquatic products.
Mr. Tran Van Chung from Phan Hien Village, Vinh Son Township (Vinh Linh District) said that pond temperatures are erratic in winter and tend to drop. Therefore, in addition to lining the entire pond, he also stores water in reservoirs and ensures that the water level in the pond is always maintained at 1.8 – 2 m; Install a soil oxygen aeration system and a roof in the ponds.
Quang Tri farmers build shelters to protect farmed seafood when the temperature drops. Photo: From crap.
“Shrimp often eat less this season and grow slower than the main crop. Therefore, shrimp farmers must regularly check the amount of feed and adjust it accordingly in order to reduce investment costs and water pollution. Shrimp must be supplemented with vitamins, minerals… to increase resistance; The pond needs to be increased with the dose of probiotics to clean the environment of the pond bottom and create the best living environment for shrimp when the temperature is low,” Chung said.
Mr. Pham Viet Tin, a household raising fish in cages at the O Lau River in Hai Phong Township, Hai Lang District, also shared that improving the resilience of aquatic products is very important. Mr. Tin has always maintained 5-7 fish cages for many years with the main animals being eels and climbing fish. Thanks to taking good care of farmed fish in the cold season, he earns about VND 150 million almost every year.
According to Mr. Tin, when the temperature is low, the cold is very cold, the fish often eat less, so it is necessary to reduce the amount of feed compared to the warm, sunny days, in order to avoid excessive feed loss and water pollution causes the cage. The temperature is low, so it is necessary to feed the fish when it is warm, usually at 8-9 a.m. and 2-3 p.m. every day.
Farmers need to regularly review environmental factors and the amount of food consumed to make appropriate adjustments to avoid food waste and reduce pollution. Photo: From crap.
“I apply measures to protect and prevent fish diseases, such as B. the lowering of cages; Check and clean cages regularly; Hanging lime bags on the corners of the cage to disinfect the water environment to destroy and restrict pathogens that cause diseases in fish,” Mr. Tin shared his experience.
The entire Hai Lang district currently has about 500 hectares of freshwater fish farms, 90 hectares of sand shrimp farms, and more than 160 cages for all kinds of fish.
In the ponds that overcome the tide, the white-leg shrimp ponds in the sand, people focus on tending to the harvest and preparing the harvest to supply the Lunar New Year market. In the face of adverse weather and persistent cold, the Hai Lang District People’s Committee has advised aquaculture households not to be subjective and focus on measures to care for and protect farmed aquatic products in the past few days. Seeds should not be stored on days with low temperatures to avoid losses.
Mr Nguyen Huu Vinh, deputy director of the Ministry of Agriculture and Rural Development in Quang Tri, said severe and damaging cold weather is expected to hit north and north-central provinces in December 2022 and early 2023.
In order to actively respond to the complicated weather changes, aquaculturists need to inspect, clean and strengthen pond banks to prevent water leakage. actively raise the water level in the pond to at least 1.5 – 2 m; Let water hyacinth cover 1/2 – 2/3 of the pond water surface in the north.
Farmers should limit net pulling, control shrimp fishing, do not expose shrimp to the low air temperature, prone to heat shock… Photo: From crap.
According to Mr. Vinh, farmers should use bamboo baskets with dried straw to sink into the bottom of the pond or use bundles of straw to bundle by using stakes to stick into the bottom of the pond as a shelter for fish. For small ponds and aquariums, make a trellis on the surface of the pond, the tank is covered with a plastic sheet to increase heat retention.
Aquaculture should be consumed full of high nutrient foods, appropriate diets and supplemented with vitamin C, minerals, etc. to increase resistance. When the pond water temperature falls below 15 degrees Celsius, farmers need to stop feeding and keep the water level of shrimp ponds at 1.8~2m to avoid sudden changes in pond water temperature, which will affect health and increase shrimp growth.
“Farmers should reduce 30-50% of daily feeding when pond water temperature falls below 20 degrees Celsius; Supplementation of vitamins, minerals, digestive enzymes… to increase resistance and ability to absorb nutrients for farmed shrimp.
Aquaculture species that reach commercial size just before harvest but cannot take action against cold, especially those with low cold tolerance such as tilapia, white pompano, snakehead, sea bass, yellowfin pompano, etc., need to be harvested early and thoroughly so that the Fish don’t die from the cold,” noted Mr. Nguyen Huu Vinh, Deputy Director of the Ministry of Agriculture and Rural Development of Quang Tri Vinh Province.