A report on Fish and Fin

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Dunkleosteus was a gigantic, 10 m long prehistoric fish of class Placodermi.
Fins are used by aquatic animals, such as this orca, to generate thrust and control the subsequent motion
Lower jaw of the placoderm Eastmanosteus pustulosus, showing the shearing structures ("teeth") on its oral surface; from the Devonian of Wisconsin
Caudal fin of a great white shark
Leedsichthys, of the subclass Actinopterygii, is the largest known fish, with estimates in 2005 putting its maximum size at 16 m.
Aquatic animals typically use fins for locomotion
(1) pectoral fins (paired), (2) pelvic fins (paired), (3) dorsal fin, (4) adipose fin, (5) anal fin, (6) caudal (tail) fin
A relative of the seahorses, the leafy seadragon's appendages allow it to camouflage (in the form of crypsis) with the surrounding seaweed.
Comparison between A) the swimming fin of a lobe-finned fish and B) the walking leg of a tetrapod. Bones considered to correspond with each other have the same color.
The psychedelic mandarin dragonet is one of only two animal species known to have blue colouring because of cellular pigment.
In a parallel but independent evolution, the ancient reptile Ichthyosaurus communis developed fins (or flippers) very similar to fish (or dolphins)
Diversity of various groups of fish (and other vertebrates) through time
In the 1990s the CIA built a robotic catfish called Charlie to test the feasibility of unmanned underwater vehicles
Lungfish are the closest living relatives of tetrapods (four-limbed vertebrates).
The bowfin Amia calva is the sole survivor of the halecomorph clade.
Organs: 1. Liver, 2. Gas bladder, 3. Roe, 4. Pyloric caeca, 5. Stomach, 6. Intestine
Tuna gills inside the head. The fish head is oriented snout-downwards, with the view looking towards the mouth.
Didactic model of a fish heart
Dorsal view of the brain of the rainbow trout
The anatomy of Lampanyctodes hectoris (1) operculum (gill cover), (2) lateral line, (3) dorsal fin, (4) fat fin, (5) caudal peduncle, (6) caudal fin, (7) anal fin, (8) photophores, (9) pelvic fins (paired), (10) pectoral fins (paired)
Swim bladder of a rudd (Scardinius erythrophthalmus)
Ovary of fish (Corumbatá)
French grunts – Haemulon flavolineatum
Whale sharks, the largest species of fish, are classified as vulnerable.
These fish-farming ponds were created as a cooperative project in a rural village.
Fish counter display at the Oulu Market Hall in Oulu, Finland.
A Bengali fish vendor
Avatar of Vishnu as a Matsya
The ichthus is a Christian symbol of a fish signifying that the person who uses it is a Christian.
These goldband fusiliers are schooling because their swimming is synchronised.
Agnatha (Pacific hagfish)
Chondrichthyes (Horn shark)
Actinopterygii (Brown trout)
Sarcopterygii (Coelacanth)
Egg of lamprey
Egg of catshark (mermaids' purse)
Egg of bullhead shark
Egg of chimaera

Fins first evolved on fish as a means of locomotion.

- Fin

In biology, the term fish is most strictly used to describe any animal with a backbone, gills throughout life, and limbs (if any) in the shape of fins. Many types of aquatic animals with common names ending in "fish" are not fish in this sense; examples include shellfish, cuttlefish, starfish, crayfish and jellyfish. In earlier times, even biologists did not make a distinction – sixteenth century natural historians classified also seals, whales, amphibians, crocodiles, even hippopotamuses, as well as a host of aquatic invertebrates, as fish.

- Fish

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Pelvic fins from a Java barb (Barbonymus gonionotus)

Pelvic fin

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Pelvic fins from a Java barb (Barbonymus gonionotus)
The pelvic fin appears at roughly 21 days post fertilization in zebrafish
Pelvic fin skeleton for Danio rerio, zebrafish.
Gobiids have modified their pelvic fins into adhesive suckers.
Lumpsuckers use their modified pelvic fins to adhere to the substrate.

Pelvic fins or ventral fins are paired fins located on the ventral surface of fish.