Some fish have bones, including full backbones and articulated skeletons, while other fish do not have bones. The bony fish, as they are known, belong to the class Osteichthyes. The other class of fish is known as Chondrichthyes, which includes cartilaginous fish like sharks and rays.
The bony fish of class Osteichthyes are the largest class of vertebrates in the animal kingdom, with more than 20,000 species known to man. Bony fish fall into two subcategories: the ray-finned fish and the lobe-finned fish. Ray-finned fish make up the vast majority of known living fish species as of July 2014; the coelacanth, once thought to be an extinct prehistoric fish, is the only known living lobe-finned bony fish.Learn More
When a lake freezes, fish survive by changing their metabolism, which lessens the amount of food and oxygen that they need. Without this adaptation, fish would not survive the icy winters.Full Answer >
While the bacteria content of every animal's mouth is unknown, there has been plenty of speculation about which animal has the cleanest mouth. Although it may seem easy to compare, according to an interview on Live Science, comparing different species' bacteria content is like comparing apples to oranges.Full Answer >
The Tomato Clownfish is a member of a group of five anemonefish known as the Tomato complex. The Tomato Clownfish is one of the largest members of the complex with females growing to be over five inches in length. On average, females are roughly half an inch longer than males.Full Answer >
In spite of the popular myth that goldfish have only a 3-second memory, research conducted at Plymouth University has demonstrated that goldfish have a memory span of up to three months. These studies have also established that goldfish are able to associate time with feeding.Full Answer >