Mosquitoes

Korean fish joins malaria fight

Scientists in South Korea have found a local fish that could help control the spread of malaria. The fish, called the muddy loach, eats mosquito larvae and can completely remove them from rice fields.

The concept of the muddy loach is simple; find fish which eat mosquito larvae, and put them in lakes and fields where larvae live and breed.

Malaria kills hundreds of thousands each year Researchers experimented with the fish in several locations in South Korea, in rice-fields farmed both organically and conventionally.

They found that by putting enough fish in a field, all the mosquito larvae would be eaten within a day.

Muddy loaches are omnivorous and hardy, which the researchers say make them ideally suited to the job.

Revival of old technique

The idea of using fish in this way dates back a century or so, but in recent decades it has fallen out of favour as more modern techniques for combating malaria, such as chemical insecticides, drugs and bednets have taken precedence.

But the researchers say muddy loaches could make a significant impact on malaria in East Asia.

It could also help in other parts of the world, where there are other fish which could do a similar job, whether in rice fields or in lakes and ponds.

And at the end of the malaria season, farmers get to eat the fish as well, fat with all the larvae they have been consuming.