A report on Pelvic fin

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.

- Pelvic fin
Pelvic fins from a Java barb (Barbonymus gonionotus)

5 related topics with Alpha

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Fin

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Thin component or appendage attached to a larger body or structure.

Thin component or appendage attached to a larger body or structure.

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Fins are used by aquatic animals, such as this orca, to generate thrust and control the subsequent motion
Caudal fin of a great white shark
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
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

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

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

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

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
Skeleton of a ray-finned fish
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
Caudal fin of a grey reef shark
Shark fin
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)
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

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.

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.
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

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

Gobiidae

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Family of bony fish in the order Gobiiformes, one of the largest fish families comprising more than 2,000 species in more than 200 genera, sometimes referred to as the "true gobies".

Family of bony fish in the order Gobiiformes, one of the largest fish families comprising more than 2,000 species in more than 200 genera, sometimes referred to as the "true gobies".

Some marine gobies live in symbiosis with shrimp.
Dried gobies for sale on the market in Odessa, Ukraine

The most distinctive aspects of gobiid morphology are the fused pelvic fins that form a disc-shaped sucker.

Cyclopteridae

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The Cyclopteridae are a family of marine fishes, commonly known as lumpsuckers or lumpfish, in the order Scorpaeniformes.

The Cyclopteridae are a family of marine fishes, commonly known as lumpsuckers or lumpfish, in the order Scorpaeniformes.

Aptocyclus ventricosus, inflated due to barotrauma
Eumicrotremus phrynoides and Eumicrotremus orbis demonstrating adhesive pelvic discs.
Eumicrotremus phrynoides
Eumicrotremus orbis
Eumicrotremus awae

The "sucker" part refers to the fish's modified pelvic fins, which have evolved into adhesive discs (located ventrally, behind the pectoral fins); the fish use these discs to adhere to the substrate.