Changing Planet

A Fisherman and Conservationist: A Kenyan Fisherman Restores Corals for 40 Years

By Jennifer O’Leary and Arthur Tuda

Pascal Yaa is a small-scale octopus fisherman who has been fishing the coral reefs off Mombasa, Kenya since 1968. As a spear-fisher, Pascal swims the reefs daily with a mask and snorkel. Recently, he has been disturbed by what he is seeing. Increasingly, fishing nets and boats are damaging and killing large, old corals. From Pascal’s perspective, reef protection and restoration are critical to ensure long-term, sustainable fishing. In his own words, Pascal says, “Corals are the homes of fish and other animals like the octopus. Sometimes fishermen with nets will kill an entire coral to get a single fish. This means fish cannot come back, because their home is gone. I have seen a lot of change in the reefs in Mombasa in my lifetime, mainly loss of corals through damage, but also from too many sea urchins (which cause bioerosion) because the sea urchin predators are gone. And, a dead coral is not the same as a live one. When a coral dies, the fish and octopus do not stay there, even though the structure may remain for some time. Only live corals provide the habitat needed for the animals that fishermen rely on for income.”

Fisherman Pascal Yaa with an octopus in the fished reef I’d Mombasa Marine Park and Reserve.

To combat the trend of coral decline, Pascal has taken action. For 40 years, he has been working to restore damaged corals in the fished areas of the Mombasa National Marine Park and Reserve. When a large coral head (typically slow growing, massive Porites) is toppled, Pascal finds its base and rights it, sometimes fortifying its position with rocks. If a branching coral (like Acropora) has been damaged, Pascal takes the broken branches and inserts them back into the branching framework so they can keep growing. Pascal also removes kilograms of discarded nets and plastic trash from the reef every day to keep corals from being further damaged.

Do these actions help? We can answer YES – because, Pascal has kept a detailed logbook of his actions and the time it takes each coral to re-attach to the reef and heal. According to Pascal’s log, large coral heads typically take 2+ years to be firmly reattached to the ocean floor, but once they do, survival is possible. This is important, because it can take decades for a large corals to grow (as documented from Pascal’s coral growth records).

According to Pascal, the path toward long-term coral reef conservation is training. “We need to train the young fishers about corals and why they are important. Many of them don’t know. I tell them, but they don’t believe me – maybe because they have not seen what I have seen.” What Pascal says is likely true. Many Kenyan fishermen don’t know how to swim, though they go out in boats daily. As a result, some fishermen have not seen what the coral reefs look like or what happens when corals are damaged or removed.

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Mombasa Marine Park and Reserve

The Kenyan Wildlife Service and the Tanzanian Marine Parks Authority have developed a program called Science for Active Management (SAM) that works with managers and stakeholders to improve marine management and conservation through monitoring and strategic, data-based decision making. Through the SAM program, Pascal has become a peer trainer for other fishermen and works with park rangers to take fishermen to the reef to snorkel and see corals. Pascal is hopeful that these trainings will make a difference.

One single fisherman has made a tremendous contribution to conservation of the fished reefs in Mombasa. It is our responsibility to support Pascal in these efforts and capitalize on his knowledge by engaging others in restoration and knowledge sharing. In the scientific literature, there is much discussion of using traditional knowledge and incorporating it into conservation planning. However, often, the discussion ends there – on paper. Pascal may not have read a single scientific paper, and his fins are old and tattered, but he has taken action that has made a measurable difference for the coral reefs he fishes.

Jennifer2014Dr. Jennifer O’Leary is a marine conservation biologist with California Sea Grant, a faculty member at California Polytechnic State University’s Center for Coastal and Marine Sciences, and a former fisheries manager. Arthur Tuda is marine protected area professional from the Kenya Wildlife Service and currently a Ph.D. student at the University of Cadiz, Spain. The SAM program was initiated through a conservation fellowship to J. O’Leary from the Robert and Patricia Switzer Foundation, and is currently supported through a grant from the Marine Science for Management program of the Western Indian Ocean Marine Science Association. Follow J. O’Leary on Twitter @JeniOLeary and the SAM Program @WIO_SAM.



  • Diane Skolnique

    Thank you Pascal Yaa for all the work you are doing. Is it possible that you go to schools to teach children about the importance of the ocean and the animal?

  • Ryan Walter

    we need more people like this in the world…

  • Robin Adams

    Fantastic story often “Science” forgets the unsung heroes of the planet, great job highlighting Mr Pascal Yaa on his mission to protect our blue planet a true Conservation Warrior who I salute

  • Dixon Korir

    Natural Resources generally is facing massive challenges globally. Indigenous knowledge is a critical cog in the wheel of sustainable conservation. Throughout the world there are Pascal Yaas who are very passionate in protecting critical minimum conservation niches.We need radical leadership at all level to show supports for all these Yaas. Dr. Jennifer O’Leary and Arthur Tuda whom I know very are leading the way.

  • Corina

    This is a good example of the fact that we should never underestimate the impact of a dedicated individual living close to nature. Well written and a great account of a shift to data driven decision making.

  • Lexie

    Great story highlighting the importance of a community being connected to the natural resources that sustain it.

  • Kyle

    This is so cool!!

  • Andrea

    So interesting, thanks for sharing!

  • Heri ibrahim

    Am cograt the Sam project for the consavesion

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