ichthyo-, ichthy-, -ichth- +

(Greek: fish)

Many fishes are arranged to form a big fish representing ichthyology.
ichthyotoxin, ichthyotoxism
Any natural toxin or poison that is produced by fish.
ichthysophilist, ichthysophile
A collector of fishing tackles.
ichthytaxidermy
The taxidermy or stuffing (mounting) of the skins of fishes as zoological specimens or as trophies for those who catch fish to hang up on their walls.
seborrhea ichthyosis
A variety of seborrhea characterized by the formation of large, platelike (fishlike) crusts.
solenichthyes
Bellows fishes; shrimpfishes; cornetfishes; pipefishes; small order of chiefly tropical marine fishes of varied and bizarre form all having a small mouth at the end of a drawn-out tubular snout.
Troglichthys rosae
A cave fish.

Other "fish" units: pisci-, Iktho Fish Story.