In a pot, place the peeled, rinsed, and chopped cocoyam. Add water and cook for 20 minutes until tender. Drain and blend into a smooth purée.
In a pot, combine sea snails with stock cubes, cover with water, and cook for 20 minutes.
Add fish, clams, sea snails, shrimp, and ground uziza. If needed, add more water and simmer until fully cooked
Remove fish from the pot and set aside.
Add cocoyam in small chunks, along with palm oil, yellow pepper, and bitter leaves.
Season with salt to taste.
Return the fish to the pot, stir, cover, and simmer.
Once the mixture thickens and becomes less soupy, remove from heat.
Serve with fufu as a side dish.