Dec 21, 2025 · Living fish species range from the primitive jawless lampreys and hagfishes through the cartilaginous sharks, skates, and rays to the abundant and diverse bony fishes.

Dec 21, 2025 · Fishes are typically divided into three groups: superclass Agnatha (jawless fishes), class Chondrichthyes (cartilaginous fishes), and superclass Osteichthyes (bony fishes).

Living species range from the primitive lampreys and hagfishes through the cartilaginous shark s, skates, and ray s to the abundant and diverse bony fishes. Species range in length from 0.4 in. …

Fishes have been in existence for more than 450 million years, and they have evolved to fit into almost every conceivable type of aquatic habitat, including both fresh and salt waters.

Dec 21, 2025 · The present distribution of fishes is a result of the geological history and development of Earth as well as the ability of fishes to undergo evolutionary change and to …

The Devonian Period is sometimes called the “Age of Fishes” because of the vast amount of primitive fish in both fresh and salt water. Fish evolved along several different lines.

Fish are a kind of animal that lives in water. Fish have lived on Earth for more than 450 million years. There are more than 24,000 species, or kinds, of fish. New ones are…

Dec 28, 2025 · Feast of the Seven Fishes, Italian American Christmas Eve meal involving the serving of a meatless dinner composed of seven different dishes of fish.

Dec 21, 2025 · Fish - Digestion, Anatomy, Nutrition: The structure of a fish's digestive system consists of the mouth, teeth and gill rakers, esophagus, stomach, pyloric ceca, pancreas, liver, …

Fishes are valuable laboratory animals in many aspects of medical and biological research. For example, the readiness of many fishes to acclimate to captivity has allowed biologists to study …