"Not just a healthy soup, it's very tasty too. I always loved this soup while growing up in the Caribbean. To my surprise it turned out to be a good warm-up drink too. Long story short, as I waited for a bus on a very cold and windy winter evening in NYC, I noticed a West Indian restaurant across the street. I ran in to get a cup of coffee or tea. The last thing on my mind was a bowl of soup. They were about to close and the only thing they had was fish soup. I took a small cup and went back to the bus stop. It warmed me up so much and reached such a good place inside me that I ran back for more."
Bring water to a boil in a large bowl. Add fish; simmer until soft, about 30 minutes. Strain fish, reserving broth. Let fish cool. Remove bones, trying to keep large pieces of fish intact.
Bring broth to a boil. Add green bananas, pumpkin, potatoes, corn, carrots, okra, scallions, chile pepper, garlic, salt, pepper, and thyme. Bring back to a boil. Reduce heat to low; simmer until potatoes are almost tender, about 10 minutes. Stir in fish. Simmer until flavors combine, about 5 minutes more.
Remove soup from heat and let stand before serving, about 30 minutes. Discard chile pepper.