A report on Pelvic fin and Fin

Pelvic fins from a Java barb (Barbonymus gonionotus)

The pelvic fin appears at roughly 21 days post fertilization in zebrafish

Fins are used by aquatic animals, such as this orca, to generate thrust and control the subsequent motion

Pelvic fin skeleton for Danio rerio, zebrafish.

Gobiids have modified their pelvic fins into adhesive suckers.

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

Lumpsuckers use their modified pelvic fins to adhere to the substrate.

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.

In a parallel but independent evolution, the ancient reptile Ichthyosaurus communis developed fins (or flippers) very similar to fish (or dolphins)

In the 1990s the CIA built a robotic catfish called Charlie to test the feasibility of unmanned underwater vehicles

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

- Pelvic fin

During courtship, the female cichlid, Pelvicachromis taeniatus, displays a large and visually arresting purple pelvic fin.

- Fin

2 related topics with Alpha

Ray fins on a teleost fish, Hector's lanternfish
(1) pectoral fins (paired), (2) pelvic fins (paired), (3) dorsal fin,
(4) adipose fin, (5) anal fin, (6) caudal (tail) fin

Fish fin

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Lobe-finned fishes, like this coelacanth, have fins that are borne on a fleshy, lobelike, scaly stalk extending from the body. Due to the high number of fins it possesses, the coelacanth has high maneuverability and can orient their bodies in almost any direction in the water.

The haddock, a type of cod, is ray-finned. It has three dorsal and two anal fins

Cartilaginous fishes, like this shark, have fins that are elongated and supported with soft and unsegmented rays named ceratotrichia, filaments of elastic protein resembling the horny keratin in hair and feathers

Similar adaptations for fully aquatic lifestyle are found both in dolphins and ichthyosaurs

In the 1990s, the CIA built a robotic catfish called Charlie, designed to collect underwater intelligence undetected

Fins are distinctive anatomical features composed of bony spines or rays protruding from the body of a fish.

Pectoral and pelvic fins have articulations resembling those of tetrapod limbs.

Fish

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Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits.

Dunkleosteus was a gigantic, 10 m long prehistoric fish of class Placodermi.

Lower jaw of the placoderm Eastmanosteus pustulosus, showing the shearing structures ("teeth") on its oral surface; from the Devonian of Wisconsin

Leedsichthys, of the subclass Actinopterygii, is the largest known fish, with estimates in 2005 putting its maximum size at 16 m.

A relative of the seahorses, the leafy seadragon's appendages allow it to camouflage (in the form of crypsis) with the surrounding seaweed.

The psychedelic mandarin dragonet is one of only two animal species known to have blue colouring because of cellular pigment.

Diversity of various groups of fish (and other vertebrates) through time

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.

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)

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.

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.

In these cases, the male is equipped with a pair of modified pelvic fins known as claspers.

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.