ichthyo-, ichthy-, -ichth- +

(Greek: fish)

Many fishes are arranged to form a big fish representing ichthyology.
ichthyophile, ichthyophilist (s) (noun); ichthyophiles; ichthyophilists (pl)
One who has a special fondness or love of fish or fishes: Jack's aquarium at home had many different kinds of fish and he loved watching them swim around. And, as an ichthyophile, he never wanted to eat them because he loved them so much.
Ichthyologist finds his sick fish and is greatly concerned.
Word Info image © ALL rights reserved.
ichthyophobia (s) (noun) (no plural)
An irrational dislike of fish or of anything associated with fish: Ichthyophobia can relate to a cultural phenomena of not eating cold-blooded aquatic vertebrates, of fearing the touch, or even of seeing a dead trout.
In mycology, a genus of fungi perhaps belonging to the order Entomophthorales; its species are fish parasites.
In veterinary medicine, a common, fatal infection of fish that causes chronic inflammation of the skin and gills in the form of spotty, white lesions, due to invasion by the protozoan fish parasite Ichthyophthirius multifilis.
Parasites causing the often fatal fresh-water fish-skin disease called "ich".
ichthyoplankton (s) (noun), ichthyoplankton (pl)
New born fish that float before they are capable of swimming by themselves: It was interesting to learn that such tiny, recently hatched fish and larvae keep their positions in the water since they cannot move independently at this early stage of life.
The sale of fish.
A seller of fish; a fishmonger.
The selling of fish.
A grand division of the Vertebrata, including the Amphibia and Fishes.
In paleontology, a proposed extinct subclass of diapsid marine reptiles, including ichthyosaurs and some related forms.
A prehistoric toothed bird, similar to a gull, that lived during the Cretaceous period; literally, a “fish-bird”.
In paleontology, an order of early flying birds in the extinct superorder Odontognathae; Cretaceous.
A poison found in the muscles or flesh of certain fish.
A poisoning that results from the ingestion of the flesh of poisonous fish, in contrast with ordinary bacterial food poisoning that might result from the ingesting (eating) of nonpoisonous fish contaminated by bacteria.

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