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Fish fins

Fins are important appendages that help fish maintain position, move, steer and stop in water. They are composed of bony spines covered in skin and aid with mobility, stability and maneuverability. The main types of fins are paired (pectoral and pelvic) and unpaired (dorsal, caudal, anal). Each fin type has a distinct function in swimming, turning and balancing. Fins have evolved diverse shapes and forms to help fish survive in their environments.

Science◦
 A fin is a thin component or appendage attached to a larger body or structure.  most distinctive features of a fish  Compose of bony spine protruding from the body with skin covering them and joining them together, either in a webbed fashion, as seen in most bony fish , or more similar to a flipper, as seen in sharks.  Fins are appendages used by the fish to maintain its position, move, steer and stop.  Fins give fish mobility, stability, and maneuverability. •Help in protection form predator
Fins are composed of two groups Paired and unpaired Paired Fins  Pectorals  Pelvics orVentrals Unpaired fins  Dorsal  Caudal or tail  Anal
 Paired fins can be used as the main means of propulsion or in combination with other swimming or crawling forms.  The pectoral and pelvic fins are also commonly used as a means of  Quickly stopping the fish,  Controlling pitching (change of position from the horizontal) and to  Attract mates or startle other fish.  Two well known examples of the use of the pectoral fins for primary propulsion are:  Labrids - the rowing type movement of the wrasse.  Rajiform - the bird like swimming of the skates and rays
1:PECTORAL FINS  On side of body , behind gill cavity  In primitive fishes, the pectoral fins are found lower on the body, nearer the ventral side.  In some look like an arm-like extension.  In other cases, the pectoral fins haveevolved to look like wings for South American flying fish  a pad for resting on the bottom in some catfish.
he pelvic fins are generally smaller than the  The pelvic fins are located ventrally below and behind the pectorals.  Pelvic fins function in stabilizing , braking, move up and down  They are of little use for locomotion.  Some have spines and rays on them.  Other fish have modified pelvic fins in the form of a sucker for holding on rocks.eg Gobies  Some fish have even lost their pelvic fins completely, especially those that spend their lives scouring along the ocean floor.
1:DORSAL FINS  Dorsal fins are located on the back or on the top of the fish  Aid the fish in sharp turns or stops, and assist the fish in rolling.  Fish may have up to three distinct dorsal fins, known as proximal, middle , and distal dorsal fins
 several fish have just two dorsal fins with the middle and distal fins fused together.  May be a fleshy ray, or quite large and supported by spines.  Dorsal fins have been modified in the remoras into a sucking disc that allows them to cling to sharks or other large fishes.  In the anglerfish, the dorsal fin has been modified into a fishing rod and lure.
Dorsal fin
 The type of Doral fins are:  Single  Split  Pointed  Trigger  SpineTriangular  Trailing
 The caudal fin is the tail tail located at the end of the caudal peduncle.  For fish identification, the type of Caudal fin is used to distinguish one type from another. Types of caudal fin  Indented  Round  Square  Forked  Lunate  Pointed  Emarginate  Heteroceral
 The anal fin is located on the ventral surface behind the anus  The anal fin is usually short, but some fish have anals that stretch from near the chin, to the caudal fin.  Very few fish have more than one anal fin(i.e., the cods),
•some do not have one at all (i.e., skates and rays). • In some species,the anal fin has modified into an organ used in copulation called gonopodium.
 Fishes such as catfish have another fleshy lobe behind the dorsal fin, called an adipose (fat) fin  Its function has remained a mystery  Additional released in 2011 has suggested that the fin may be vital for the detection of and response to stimuli such as touch, sound and changes in pressure
 Finlets are small fins located between the dorsal fin and the tail of the fish  anal fins and the tail of the fish.  These finlets are found on fast swimming fish like tuna, and is said to aid in the speed of the fish, by cutting through the water.
Fish fins