English

fishdom

From fish + -dom.

Formed from fish + -dom

Proto-Indo-European *piskós

Proto-Germanic *fiskaz

Proto-West Germanic *fisk

Old English fisċ

Middle English fisch ‘an animal that inhabits the water or the meat…’

English fish

Today it means

noun The state of being a fish, or of belonging to the world of fish; fish collectively.

Language periods are conventional ranges, not dates for this word.