Fish People has these relationships to other tropes:

parents kids shares a parent with:
Intelligent Gerbil
Our Mermaids Are Different
parent child
Intelligent GerbilUplifted Animal
''Cat Folk
''Lizard Folk
''Pig Man
Our Mermaids Are DifferentSapient Cetaceans
Intelligent GerbilUrsine Aliens
Our Mermaids Are DifferentUnscaled Merfolk
''Sirens Are Mermaids
''Apparently Human Merfolk
''Mermaid Problem
You'll need to Get Known if you want to add or modify these relationships.