Group 1 - The local government in Zhancheng District, Foshan City, has implemented a biological mosquito control method by releasing thousands of fish, specifically 4,200 fish fry including 4,000 silver carp and 200 Lali Maozu bass, into local parks to combat the spread of the Chikungunya virus [2] - The initiative aims to reduce mosquito breeding density by utilizing fish that feed on mosquito eggs and larvae, thereby interrupting the transmission chain of mosquito-borne diseases [2][4] - The fish species released are local varieties, and the Lali Maozu bass is a common ornamental fish, which minimizes ecological impact compared to invasive species like the "mosquito fish" [4] Group 2 - The "mosquito fish," originally from Mexico and the United States, is known for its aggressive nature and high reproductive rate, posing a significant threat to local ecosystems and is classified among the top 100 invasive species globally [4] - The local authorities will continue to monitor and evaluate the ecological impact and effectiveness of the fish released in controlling mosquito populations [4]

Core Viewpoint - The article highlights the introduction of new fish species and innovative farming models in Le Yuan Town, Zhenjiang District, Shaoguan City, aimed at enhancing the quality and efficiency of fish farming [2][3][4]. Group 1: New Species Introduction - The introduction of "Engineering Carp" and "Native Carp" as new species for fish farming is aimed at improving the existing aquaculture structure dominated by four major fish types [7][8]. - "Engineering Carp" is characterized by fast growth and low oxygen tolerance, suitable for mixed farming with other species, potentially increasing profits by 800 yuan per mu [9][10]. - "Native Carp" helps in algae removal and water quality improvement, allowing for cohabitation with other fish, and can reduce water adjustment costs by 100 yuan per mu [12][13]. Group 2: Implementation and Support - The first batch of seedlings has been distributed for free to five demonstration households, showcasing mixed farming models involving various species [14][20]. - A "one-on-one" technical tracking service is being implemented, with plans for broader replication across the town next year [18][20]. - The technology commissioner is addressing key challenges in water quality, disease management, and cost reduction at local aquaculture bases, with further training and collaborative experiments planned for August [21][22].