Phayao: "Crayfish" have invaded Phayao Lake, leading to a decrease in shrimp populations and raising concerns among local fishermen.

According to Thai News Agency, the presence of crayfish, which are considered an invasive species, poses a significant threat to the aquatic ecosystem, prompting calls for immediate action.

Fishermen around Phayao Lake have reported a surge in crayfish catches, coinciding with a decline in the freshwater shrimp population. The local community is uncertain about the extent of the crayfish's impact on other aquatic life but is alarmed by the sudden changes. Mr. Pisit Phumkhong, the Phayao Provincial Fisheries Officer, noted that fishermen using traditional traps have been catching significant quantities of red-clawed shrimp, averaging 1.5-2 kilograms per day, which they sell at 200-250 baht per kilogram. In contrast, others in the area only catch a few red-clawed shrimp.

Efforts to manage the situation include measures by the Phayao Provincial Fisheries Office to regulate red-clawed shrimp farming. Controlled aquaculture zones were established in 2016, with regular inspections ensuring compliance with regulations. Despite the challenges, only one registered crayfish farm remains operational under close supervision to prevent further escape into natural waterways.

The origin of the crayfish infestation is suspected to be linked to ornamental pet releases into natural water sources, allowing them to spread and reproduce. The Phayao Provincial Fisheries Office is actively working to raise public awareness and seeks cooperation from various sectors to monitor and mitigate the long-term impacts on the ecosystem.

Dr. Jessada Denduangboriphant from Chulalongkorn University emphasized the invasive nature of crayfish, warning that they compete for habitat and food, leading to declines in native species. He urged the public to capture or destroy the crayfish before they spread uncontrollably, drawing parallels to past issues with other invasive species.

The situation at Phayao Lake highlights the urgent need for measures to control the crayfish population and protect the local aquatic ecosystem from further harm.