bowfin - definizione. Che cos'è bowfin
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Cosa (chi) è bowfin - definizione

SPECIES OF FISH
Amia calva; Bow-fin; Grinnell fish; Mud pike; Grinnel; Swamp trout; Choupique
  • Drawing of a bowfin skull showing the bony plates protecting the head
  • Dissection of a bowfin [[swim bladder]]
  • Lateral view of a bowfin skull: The dermal bones that are seen are composed of dermatocranium and cover the chondrocranium which is present but is located underneath the layer of dermatocranium. This specimen came from the Pacific Lutheran University Natural History collection.
  • Freshly caught bowfin
  • Bowfin activity in an aquarium}}
  • Diagram showing fins and eyespot of a bowfin, USF&WS
  • Three divisions of [[Neopterygii]] comprising [[Lepisosteiformes]], [[Amiiformes]], and [[Teleostei]]
  • Dorsal view of a bowfin skull, showing the pharyngeal tooth patches which are connected to the internal portion of the hyomandibular bone. Acquired from Pacific Lutheran University.
  • The [[gill raker]]s are short with blunt processes and with a small space in between them. They are connected to the gill arch of the gills.
  • ''Lernaea'', or [[anchor worm]], on a [[Murray cod]]. The same parasite also attacks bowfin.
  • ''Amia calva'' distribution in the eastern U.S., as well as from the [[St. Lawrence River]] and [[Lake Champlain]] drainage of southern [[Ontario]] and [[Quebec]], westward around Great Lakes in southern Ontario into Minnesota

Bowfin         
·noun A voracious ganoid fish (Amia calva) found in the fresh waters of the United States; the mudfish;
- called also Johnny Grindle, and dogfish.
bowfin         
['b??f?n]
¦ noun a predatory American freshwater fish with a large blunt head and a long dorsal fin, able to survive long periods out of water. [Amia calva.]

Wikipedia

Bowfin

The bowfin (Amia calva) is a bony fish, native to North America. Common names include mudfish, mud pike, dogfish, grindle, grinnel, swamp trout, and choupique. It is regarded as a relict, being one of only two surviving species of the Halecomorphi, a group of fish that first appeared during the Early Triassic, around 250 million years ago. The bowfin is often considered a "primitive fish" because they have retained some morphological characteristics of their early ancestors. It is one of two species in the genus Amia, along with Amia ocellicauda, the eyespot bowfin. The closest living relatives of bowfins are gars, with the two groups being united in the clade Holostei.

Bowfins are demersal freshwater piscivores, commonly found throughout much of the eastern United States, and in southern Ontario and Quebec. Fossil deposits indicate Amiiformes were once widespread in both freshwater and marine environments across North and South America, Europe, Asia, and Africa. Now, their range is limited to much of the eastern United States and adjacent southern Canada, including the drainage basins of the Mississippi River, Great Lakes, and various rivers exiting in the Eastern Seaboard or Gulf of Mexico. Their preferred habitat includes vegetated sloughs, lowland rivers and lakes, swamps, and backwater areas; they are also occasionally found in brackish water. They are stalking, ambush predators known to move into the shallows at night to prey on fish and aquatic invertebrates such as crawfish, mollusks, and aquatic insects.

Like gars, bowfin are bimodal breathers – they have the capacity to breathe both water and air. Their gills exchange gases in the water allowing them to breathe, but they also have a gas bladder that serves to maintain buoyancy, and also allows them to breathe air by means of a small pneumatic duct connected from the foregut to the gas bladder. They can break the surface to gulp air, which allows them to survive conditions of aquatic hypoxia that would be lethal to most other species. The bowfin is long-lived, with age up to 33 years reported.

Esempi dal corpus di testo per bowfin
1. He said crawfishermen are making up the difference with bowfin fish (the eggs are called "Cajun caviar," he said) and alligator skins.