Crabs die from parasites.

(CT) - The Department of Agriculture and Rural Development of Ca Mau province has just reported on the recent losses of farmed crabs. According to the report, from the beginning of 2023 to the present, farmed crabs have died sporadically in several aquaculture farming areas such as Dam Doi, Nam Can, and Ngoc Hien districts, affecting a total area of ​​over 12,000 hectares, with damage levels ranging from 20-60%. This is the third consecutive year that Ca Mau has detected scattered deaths of farmed crabs in shrimp ponds. Through analysis of dead crab samples, a research team from the Southern Hau River Fisheries Research Institute initially identified the causative agent as a parasitic crustacean found in the crab's body cavity. While awaiting research results from the Southern Hau River Fisheries Research Institute to develop effective disease control measures, the Department of Agriculture and Rural Development of Ca Mau province requests that local specialized units monitor the situation, disseminate information, and guide farmers to cooperate with specialized forces in handling disease outbreaks when detected. Crabs should be harvested at marketable size when diseased or dead to minimize losses. When dead crabs are found in ponds, they should be collected, buried, and treated with lime or chlorine to prevent the spread of disease to surrounding areas. The farming season should be interrupted, no further stocking should be done, and ponds should be renovated to prevent disease recurrence. When conditions are suitable for stocking, select good quality, large-sized juveniles, stocking at a density of 0.2-0.5 crabs/m2, with the next stocking occurring 2-2.5 months later. For the supplementary farming season, the stocking density should be half that of the main season.

Ca Mau currently has over 250,000 hectares of crab farming area, making it the largest crab farming area in the country, with an estimated total production of approximately 25,000 tons per year and a total value of about 10,000 billion VND.

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