Coral reefs get all the attention. But Tanzania's seagrass meadows are quietly doing some of the most important work in the ocean — storing carbon, feeding fish, and supporting the dugongs and sea turtles that coastal communities have depended on for generations. Here is why we should be paying more attention.
Ask someone what they think of when they imagine Tanzania's marine environment and they will likely say coral reefs. Maybe mangroves. Almost nobody says seagrass.
That is a problem — because seagrass meadows are among the most valuable ecosystems on the planet, and Tanzania has a significant amount of them.
Seagrass beds are the ocean's nurseries. Juvenile fish of commercially important species — the snapper, the grouper, the rabbitfish — spend their early lives in seagrass meadows before moving out to the reef. Without seagrass, reef fish populations decline. Without reef fish, coastal communities that depend on fishing lose their food security and their income.
Seagrass also stores carbon. Not in small amounts — seagrass meadows store carbon at rates that rival or exceed many tropical forests. As the world increasingly looks for natural ways to offset carbon emissions, seagrass is becoming a significant asset in the blue carbon conversation.
And seagrass supports Tanzania's endangered megafauna. Dugongs — the gentle sea cows that once were common along Tanzania's coast — feed almost exclusively on seagrass. Sea turtles depend on it too. The health of Tanzania's seagrass is directly linked to the survival of these species.
Yet seagrass is disappearing. Boat propeller damage, coastal development, agricultural runoff, and declining water quality are all taking a toll. In many areas, the loss is happening faster than anyone is measuring it.
This is exactly why the survey work we are conducting — mapping and assessing seagrass alongside coral reefs and seaweed across the entire Tanzanian coastline — is so important. You cannot protect what you have not measured. And Tanzania cannot afford to lose what its seagrass meadows quietly provide.
“Seagrass beds are the ocean's nurseries.”
Published by BlueGreen Tanzania
Field notes from our work across the Tanzanian coast.