A report on Fish fin, Fin and 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
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Pelvic fins from a Java barb (Barbonymus gonionotus)
Skeleton of a ray-finned fish
Fins are used by aquatic animals, such as this orca, to generate thrust and control the subsequent motion
The pelvic fin appears at roughly 21 days post fertilization in zebrafish
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.
Caudal fin of a great white shark
Pelvic fin skeleton for Danio rerio, zebrafish.
The haddock, a type of cod, is ray-finned. It has three dorsal and two anal fins
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
Gobiids have modified their pelvic fins into adhesive suckers.
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
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.
Lumpsuckers use their modified pelvic fins to adhere to the substrate.
Caudal fin of a grey reef shark
In a parallel but independent evolution, the ancient reptile Ichthyosaurus communis developed fins (or flippers) very similar to fish (or dolphins)
Shark fin
In the 1990s the CIA built a robotic catfish called Charlie to test the feasibility of unmanned underwater vehicles
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

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

- Fish fin

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

- Pelvic fin

Dermal fin rays (lepidotrichia) are positioned distally from the radials.

- Pelvic fin

Fish fins are used to generate thrust and control the subsequent motion.

- Fin

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

- Fish fin

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

- 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

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