Ichthyology

Ichthyology is the branch of zoology that studies fishes, including their classification, anatomy, behavior, evolution, and ecology.

Vertebrate: An animal with a backbone or a notochord that develops into one. Fishes are vertebrates, sharing this defining feature with amphibians, reptiles, birds, and mammals.
Swim bladder: A gas-filled organ that helps many bony fishes control buoyancy. Its volume changes let many fishes hover at depth without constant swimming.
Fisheries science: The study and management of fish populations and fisheries. Fish biology and population data guide harvest limits and sustainable management.
Aristotle: An ancient Greek philosopher whose writings included observations and classifications of animals. His careful descriptions of aquatic animals helped establish early zoological study.
Deep-sea fish: A fish adapted to life in the ocean's deep-water habitats. Their remote habitats leave many species and aspects of their biology poorly known.
Jawless fish: A fish without jaws, including lampreys and hagfishes. Jawless fishes represent an early-diverging branch of living fish diversity.
Fish gill: A respiratory organ that extracts oxygen from water and releases carbon dioxide. Gill structure explains how fishes exchange gases in an aquatic environment.
Fish conservation: The protection and recovery of fish species, populations, and habitats. Ichthyological knowledge helps identify threatened species and the causes of decline.
Carl Linnaeus: A Swedish naturalist who formalized binomial nomenclature and hierarchical biological classification. His naming system remains central to identifying and communicating about fish species.
Fish migration: The regular movement of fishes between locations, often linked to feeding or reproduction. Migration routes and environmental cues remain difficult to track for many species.

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