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Fit for a fish: This fishing community is building underwater ‘houses’ for fish

Updated: Nov 20, 2022

Which comes first, the fish or the fishes' homes? For these fishers on the shores of the Indian Ocean, building coral reef homes for fish is a top priority.

by bird story agency staff

“Coral reefs are like a house for fish. The moment they are destroyed, they cannot breed as effectively and neither will they be comfortable,” Katana Ngala, a fisher turned coral reef restorer from Kuruwitu, on the shores of the Indian Ocean in Kilifi, tells us.

Ngala has been involved in coral reef restoration since 2019. Besides leading the community initiative, he doubles up as a coral technician for Oceans Alive Trust, a local organisation protecting marine life on the Kenyan coast.

Climate change has affected the ocean ecosystem, especially rising ocean temperatures. High temperatures bleach tiny algae cells on corals and deactivate their growth. Since most fish find shelter, food, reproduce and rear their young in the nooks formed by corals, the loss of corals leads to a decline in fish.

A seasoned fisher since he was 16, Ngala has witnessed a significant drop in fish quantity.

“Back then, there were lots of fish, but over time, especially in 2003, there was a sharp decline. The fishing gears used by our grandparents were made to trap mature fish unlike those that most fishers use today,” he says.

Knowing their livelihood was at stake, he mobilised fishers from neighbouring fishing landing sites, including Bureni, Vipingo, Kinuni, Kuruwitu, Kijangwan and Mwanamia. Together, they created Kuruwitu Conservation & Welfare Association.

The community initiative has been the fishers’ vehicle for propagating their interests while ensuring they conserve fish through coral restoration.

Nursering of corals on the coral bed. (Photo : bird story agency)

“Our immediate goal was to stop aquarium dealers who would trap ornamental fish and sell them at high prices without benefitting us. We also wanted to adjust our fishing gears to allow immature fish to grow and restore fish quantity,” he explains.

The group constructs brick structures that immerse into the identified coral restoration site before they line up artificial corals on a plug plate spread on the bricks.

Restored coral reefs in the Indian Ocean. (Photo : bird story agency)

Fish are then attracted to the plugs, which over time, grow corals using them as breeding grounds and resting spaces. They occasionally visit the sites to brush off algae that could hinder coral growth.

“When there are coral algae which can stop the coral reefs from growing on the plug, you have to scratch it using a knife,” Ngala illustrates.

Already, the group is witnessing a positive outcome from their coral restoration activities at the ocean shores.

“Fish has increased because they can now breed better,” he explains.

The initiative has attracted different groups that seek to benchmark and learn coral restoration practices.

Ngala believes coral restoration is the surest way to ensure climate adaptation while urging the limitation of human activities that exacerbate climate change and its resultant effects. He, however, remains committed to the call to improve marine ecosystems.

Ngala holding corals ready for nursering on the coral beds. (Photo : bird story agency)

“It has taken me a lot to restore corals…All of us should take care of the marine biodiversity so that the next generation can enjoy it also,” he explains.

bird story agency.


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