Fish May Control Malaria Spread

Summary of Key Points on Malaria Control using Gambusia Affinis Halbrooki

• Species Identification:

  • Gambusia Affinis Halbrooki: A three-inch long fish identified as an efficient predator of Anopheles stephensi larvae, the primary vector for malaria transmission in urban areas.

• Research and Study:

  • Conducted over two years in Hyderabad, spearheaded by Dr. N. L. Sitaraman (National Malaria Eradication Programme, Bangalore) along with Dr. M. A. Karim and Dr. G. Venkata Reddy from the Andhra Pradesh Health Department.
  • Fish were released into 3,800 wells across Hyderabad to assess their effectiveness in controlling mosquito populations.

• Results:

  • Immediate outcome: Mosquito larvae density reduced by 50% following fish release.
  • After six months: Only 18 mosquito pupae were observed in all wells, indicating effective suppression of mosquito breeding cycles as long as the fish population was maintained.
  • Malaria cases remained low or non-existent throughout the duration of the study.

• Economic Analysis:

  • The cost involved in keeping wells free of mosquito breeding was ₹15 per month, indicating a low-cost solution to a public health issue.

• Implications for Policy:

  • This study may influence strategies under the National Malaria Eradication Programme (NMEP), shifting towards biological control methods.

These findings highlight a promising shift in malaria control strategies, emphasizing cost-effectiveness and biological intervention in urban settings.