Fish for life

Coelacanth The term "fish" most precisely describes any non- tetrapod craniate i.

Fish for life

Coelacanth The term "fish" most precisely describes any non- tetrapod craniate i. As paraphyletic groups are no longer recognised in modern systematic biologythe use of the term "fish" as a biological group must be avoided.

Fish for life

Many types of aquatic animals commonly referred to as "fish" are not fish in the sense given above; examples include shellfishcuttlefishstarfishcrayfish and jellyfish.

In earlier times, even biologists did not make a distinction — sixteenth century natural historians classified also sealswhales, amphibianscrocodileseven hippopotamusesas well as a host of aquatic invertebrates, as fish. In some contexts, especially in aquaculturethe true fish are referred to as finfish or fin fish to distinguish them from these other animals.

A typical fish is ectothermichas a streamlined body for rapid swimming, extracts oxygen from water using gills or uses an accessory breathing organ to breathe atmospheric oxygen, has two sets of paired fins, Fish for life one or two rarely three dorsal fins, an anal fin, and a tail fin, has jaws, has skin that is usually covered with scalesand lays eggs.

Each criterion has exceptions. Tunaswordfishand some species of sharks show some warm-blooded adaptations —they can heat their bodies significantly above ambient water temperature. Lungfish have paired lungs similar to those of tetrapods, gouramis have a structure called the labyrinth organ that performs a similar function, while many catfish, such as Corydoras extract oxygen via the intestine or stomach.

Similarly, the surface of the skin may be naked as in moray eelsor covered with scales of a variety of different types usually defined as placoid typical of sharks and rayscosmoid fossil lungfish and coelacanthsganoid various fossil fish but also living gars and bichirscycloidand ctenoid these last two are found on most bony fish.

Fish species diversity is roughly divided equally between marine oceanic and freshwater ecosystems. Coral reefs in the Indo-Pacific constitute the center of diversity for marine fishes, whereas continental freshwater fishes are most diverse in large river basins of tropical rainforestsespecially the AmazonCongoand Mekong basins.

Fish anatomy and Fish physiology The anatomy of Lampanyctodes hectoris 1 — operculum gill cover2 — lateral line, 3 — dorsal fin, 4 — fat fin, 5 — caudal peduncle, 6 — caudal fin, 7 — anal fin, 8 — photophores, 9 — pelvic fins paired10 — pectoral fins paired Respiration See also: Aquatic respiration Gills Most fish exchange gases using gills on either side of the pharynx.

Gills consist of threadlike structures called filaments. Each filament contains a capillary network that provides a large surface area for exchanging oxygen and carbon dioxide.

Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gills. In some fish, capillary blood flows in the opposite direction to the water, causing countercurrent exchange. The gills push the oxygen-poor water out through openings in the sides of the pharynx.

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Some fish, like sharks and lampreyspossess multiple gill openings. However, bony fish have a single gill opening on each side. This opening is hidden beneath a protective bony cover called an operculum.

Juvenile bichirs have external gills, a very primitive feature that they share with larval amphibians. Air breathing Tuna gills inside the head.Powell's Blog Lists National Hispanic Heritage Month by Powell's Books Hispanic Heritage Month, like all cultural observances, is a reminder to read and recommend beyond the limits of our individual experiences and knowledge.

Jellyfish, jellies or sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum barnweddingvt.comish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles, although a few are not mobile, being anchored to the seabed by .

Fish for life

September 5, Continuing his efforts to increase access to public lands, U.S. Secretary of the Interior Ryan Zinke will open more than , acres to new or expanded hunting and fishing opportunities at 30 national wildlife refuges across the Service’s National Wildlife Refuge System.

The term "fish" most precisely describes any non-tetrapod craniate (i.e. an animal with a skull and in most cases a backbone) that has gills throughout life and whose limbs, if any, are in the shape of groupings such as birds or mammals, fish are not a single clade but a paraphyletic collection of taxa, including hagfishes, lampreys, sharks and rays, ray-finned fish, coelacanths.

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