The modified root system  

The trees in the wet mangrove forest have had to modify their roots in order to find a good hold in the unstable ground. The lower part of the trunk has numerous extensions, commonly called ‘gambas’ (shrimp) that form reinforcement and stability for the tree.

The "gambas" are actually root extensions which grow from the trunk and grow down into the water. Many trees that grow in swampy areas use this modification to compensate for the shifting ground beneath in order to increase the strength for the trunk.