Fish anatomy

Fish anatomy is primarily governed by the physical characteristics of water, which is much denser than air, holds a relatively small amount of dissolved oxygen, and absorbs light more than does air. Fish anatomy - Body. Nearly all fish have a streamlined body, which is divided into head, trunk, and tail, although the dividing points are not always externally visible. The head includes the snout, from the eye to the forwardmost point of the upper jaw, the operculum or gill cover, and the cheek ...

Including:

• Fish anatomy - Body
• Fish anatomy - Fins
• Fish anatomy - Scales

Read more here: » Fish anatomy: Encyclopedia - Fish anatomy

Nearly all fish have a streamlined body, which is divided into head, trunk, and tail, although the dividing points are not always externally visible. The head includes the snout, from the eye to the forwardmost point of the upper jaw, the operculum or gill cover, and the cheek, which extends from eye to preopercle. The lower jaw defines a chin. The head may have several fleshy structures known as barbels, which may be very long and resemble whiskers. Many fish species also have a variety of protrusions or spines on the head. The nostr ...

See also:

Fish anatomy, Fish anatomy - Body, Fish anatomy - Fins, Fish anatomy - Scales

Read more here: » Fish anatomy: Encyclopedia II - Fish anatomy - Body

Conodonta Hyperoartia Petromyzontidae (lampreys) Pteraspidomorphi (early jawless fish) Thelodonti Anaspida Cephalaspidomorphi (early jawless fish) Galeaspida Pituriaspida Osteostraci Gnathostomata (jawed vertebrates) Placodermi Chondrichthyes (cartilaginous fish) Acanthodii Osteichthyes (bony fish) Actinopterygii (ray-finned fish)
Including:

• Fish - Fish ecology
• Fish - Note on usage: fish vs. fishes
• Fish - Fish as food

Read more here: » Fish: Encyclopedia - Fish

In its external appearance, G. Gangeticus is a typical requiem shark. It is stocky, with a broadly rounded snout and small eyes. The first dorsal fin is over the last third of the pectoral fins, with a free rear tip that is well in front of the pelvic fins. The second dorsal fin is much smaller than the first, but is still relatively large. The anal fin is slightly smaller than the second dorsal fin. The pectoral fins are broad and falcate. A longitudinal upper precaudal pit is present, but the interdorsal ridge is absent. The shark tends to have a uniform gray to brownish coloratio ...

See also:

Ganges shark, Ganges shark - Appearance, Ganges shark - Distribution, Ganges shark - Biology, Ganges shark - Endangerment, Ganges shark - Danger to humans

Read more here: » Ganges shark: Encyclopedia II - Ganges shark - Appearance

Fish can be found in almost all large bodies of water in salt or brackish or fresh water, at depths from just below the surface to several thousand meters. However, hyper-saline lakes like the Great Salt Lake do not support fishes. Some species of fish have been specially bred to be kept and displayed in an aquarium, and can survive in the home environment. Catching fish for the purpose of food or sport is known as fishing. The annual yield from all fisheries worldwide is about 100 million tonnes. Overfishing is a threat to many speci ...

See also:

Fish, Fish - Fish ecology, Fish - Note on usage: fish vs. fishes, Fish - Fish as food

Read more here: » Fish: Encyclopedia II - Fish - Fish ecology

The shark, though poorly documented, is known to inhabit only freshwater, inshore marine and estuarine systems. Its feeding habits are unknown. Its maximum size is probably in the area of 204 cm. It is probably viviparous, measuring 55 cm to 60 cm at birth. A related species is the Speartooth shark (Glyphis glyphis), although its distribution is different. ...

See also:

Ganges shark, Ganges shark - Appearance, Ganges shark - Distribution, Ganges shark - Biology, Ganges shark - Endangerment, Ganges shark - Danger to humans

Read more here: » Ganges shark: Encyclopedia II - Ganges shark - Biology

Fish can be found in almost all large bodies of water in salt or brackish or fresh water, at depths from just below the surface to several thousand meters. However, hyper-saline lakes like the Great Salt Lake do not support fishes. Some species of fish have been specially bred to be kept and displayed in an aquarium, and can survive in the home environment. Catching fish for the purpose of food or sport is known as fishing. The annual yield from all fisheries worldwide is about 100 million tonnes. Overfishing is a threat to many speci ...

See also:

Fish, Fish - Fish ecology, Fish - Note on usage: fish vs. fishes, Fish - Fish as food, Fish - Classification

Read more here: » Fish: Encyclopedia II - Fish - Fish ecology

Fish are a paraphyletic group: that is, any clade containing all fish also contains the tetrapods, which are not fish. Fish are classified into the following major groups: Conodonta Hyperoartia Petromyzontidae (lampreys) Pteraspidomorphi (early jawless fish) Thelodonti Anaspida Cephalaspidomorphi (early jawless fish) Galeaspida Pituriaspida Osteostraci Gnathostomata (jawed vertebrates) Placodermi Ch ...

See also:

Fish, Fish - Fish ecology, Fish - Note on usage: fish vs. fishes, Fish - Fish as food, Fish - Classification

Read more here: » Fish: Encyclopedia II - Fish - Classification

The fins are the most distinctive features of a fish. The dorsal fin is located on the back. The caudal fin corresponds to the fish tail. The anal fin is located on the bottom, behind the anus. The pectoral fins are located on each side, usually at a middle height on the body just behind the head. The pelvic fins are on the belly. Some types of fish have a small fleshy adipose fin on the back just forward of the caudal fin. Some types ...

See also:

Fish anatomy, Fish anatomy - Body, Fish anatomy - Fins, Fish anatomy - Scales

Read more here: » Fish anatomy: Encyclopedia II - Fish anatomy - Fins