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Fish and Fishes
Fish are aquatic vertebrate animals that have gills but lack limbs with digits, like fingers or toes. Recall that vertebrates are animals with internal backbones. Most fish are streamlined in their general body form.


Image courtesy of Brian Gratwicke, Flickr


Image courtesy of Paul Asman and Jill Lenoble, Flickr


Image courtesy of Kydd Pollack, US Fish and Wildlife Service (USFWS)



The word fish is the same whether it is singular or plural—you can talk about one fish or ten fish. The word fish is used to refer to an individual fish or to a group of fish of the same species. The word fishes refers to multiple species of fish.




Image courtesy of National Oceanic and Atmospheric Administration (NOAA)



If you have two fish, it means you have two individual fish that are the same species, but if you have two fishes, it means you have two individual fish of different species. For example, 1 convict tang is a fish, 2 convict tangs are 2 fish, and a group of 20 convict tangs are still 20 fish (Fig. 4.2). However, a convict tang together with a moray eel would be 2 fishes (Fig. 4.3).

Defining a Fish
Defining a fish is difficult because the term fish includes a very wide range of aquatic animals. In fact, there are about as many species of fishes than there are of all other vertebrates combined (Fig. 4.4). Of the nearly 50,000 species of animals with backbones, approximately 4,500 are mammals, 9,700 are birds, 6,500 are reptiles, 4,000 are amphibians, and 25,000 are fishes. Although these numbers change as new species are discovered, new fishes are found more often than other new vertebrates are found. As scientists make new discoveries, it is expected that the number of species of fishes will outnumber other vertebrates even more.



Image by Byron Inouye


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With so many animals identified as fish, it is not surprising that they come in all shapes and sizes and can be found in a range of habitats. Fishes live down deep and up high—from the deepest depths of the oceans to mountain pools high in the Andes. Fishes live in warm and cold water—from desert pools to under Arctic pack ice.



VOICE OF THE SEA
Voice of the Sea: Deep Sea Lab


Image Courtesy of Zac Wolf


Fishes also range in size from very small, like the tiny cyprinid in Indonesia, which grows to a maximum length of 10 mm (Fig. 4.5 A) to the large whale shark Rhincodon typus, which reaches 12 meters (Fig. 4.5 B), with thier skeletons showing great variety in size, composition, and structure (Fig. 4.6). Fishes have a wide range of diets, including plankton, algae, fish, seals, and turtles. Some fishes are parasites, some are blind, some are venomous, and some can even produce electricity. With all of this amazing diversity, it is challenging to make a definition that describes all


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