👉 Merhynchites are a group of small, freshwater fish that live in the Amazon River basin in South America. They are known for their distinctive green coloration and have been found in various habitats such as mangrove forests, freshwater lakes, and rivers. These fish are also important food sources for many native species, including the Amazonian giant peacockfish (Amphipoda) and the black-billed pufferfish (Pomacanthus).