A fish is any of approximately 34,000 species of vertebrate animals. The term fish is applied to a variety of vertebrates of several evolutionary l...

When a fish sleeps, it exists in a seemingly listless state in which the fish maintains its balance but moves slowly. If attacked or disturbed, mos...

The organs of hearing in fish are entirely internal, located within the skull, on each side of the brain, and somewhat behind the eyes. Sound waves...

Bony fish, jawless fish and cartilaginous fish.

The most famous fish is the coelacanth, which has four lobed fins resembling limbs. It is one of the world’s most ancient fish species. Its name me...

Yes, fish can feel pain, but it is different from the expression of pain from humans. It is difficult to test fish for pain except by looking for u...

Fish can be predatory, foraging or filter-feeding. Their diets can be carnivorous or omnivorous depending on the species and can include prey from...

Fish usually breathe through gills, which filters oxygen through water. However, some fish breathe using different means. Lungfish have lungs and m...

The smallest fish is the cyprinid fish (8mm) and the largest fish is the whale shark (12m).

“Fish” refers to the singular and one species or to the plural within context. “Fishes” refers to the plural, especially when talking about more th...

The main differences between the flying fox fish and the Siamese algae eater are color, length and shape, mouth shape, and algae preferences.