- In states like Andhra Pradesh, Odisha, and Punjab, mosquitofish have been released into local water bodies to address a mosquito menace.
- A new study has revealed that two species of mosquitofish have invaded various ecosystems across India.
MOSQUITO BORNE DISEASES
- The world’s climate and habitats have changed noticeably in the last century, accelerating the spread of mosquito-borne diseases.
- These diseases prevail in more than 150 countries worldwide, affecting more than 500 million people.
- In India alone, around 40 million individuals contract mosquito-borne diseases every year.
- Examples of mosquito borne diseases- Malaria, West Nile Virus, Dengue, Zika, Yellow Fever, Chikungunya.
ABOUT GAMBUSIA FISH
- In such scenario, the biological control of mosquitoes assumes importance.
In 1928, Gambusia was first introduced in India during British rule. |
- In the 1960s, introducing mosquitofish in freshwater ecosystems to feed on mosquito larvae – became prominent as alternatives to chemical solutions like pesticides.
- Among mosquito predators, there were two species of mosquitofish, Gambusia affinis and Gambusia holbrooki.
- In countries with governments that had approved this strategy, the authorities released them into freshwater ecosystems.
- However the fish began to proliferate, with their populations eventually spreading far beyond their original habitats.
- These species of mosquitofish originated in the U.S. but today have become global inhabitants.
- Threats- They are notorious for their detrimental ecological impact, including displacing and preying on native fauna, leading to the extinction of native fish, amphibians, and various freshwater communities.
- Checks-
- Because of such threats, the World Health Organisation stopped recommending Gambusia as a mosquito control agent in 1982.
- In 2018, the National Biodiversity Authority of the Government of India also designated G. affinis and G. holbrooki as invasive alien species.
But both government and non-governmental organisations in India have continued to introduce these species for mosquito-control.
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