Fish morphology - fish fins

Fins are the most distinctive morphological features of fish and they plays a predominant role for locomotion of fish under the water. It is important to know how many kinds of fins are present and their precise functions.

1. FISH FINS By Suman Deyashi 1

2. What are fish Fins ? Fins are the chief organs of locomotion in fishes and the most distinctive features of a fish. Benefits of fins 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 from predator. 2

3. GROUP OF FINS PAIRED FINS: UNPAIRED FINS Pectorals Pelvics or Ventrals Dorsal Adipose Anal Caudal 3

4. Pectoral fins The paired  pectoral fins  are located on each side, usually just behind the operculum. PAIRED FINS Pelvic fins The paired  pelvic  or  ventral fins  are typically located ventrally below and behind the pectoral fins. Function of Paired Fins Used as the main means of Propulsion. Quickly stopping the fish. Controlling Pitching (change the position from the Horizontal). Attract mates. 4

5. FLYING FISH ( Exocoetidae) Flying fish are ray-finned fish with highly modified Pectoral fins. Once in the air, their rigid “wings” allow them to glide for up to 650 feet (200 meters). Another interesting characteristic of the flying fish is its unevenly forked tail , Some flying fish also have winglike pelvic fins that help them to glide . These species are called four-winged flying fish. 5

6. Frogfish Once the prey is spotted, they can approach slowly using their Pectoral and Pelvic fins  to walk along the floor.  They move their pectoral fins simultaneously forward and back , transferring their weight to the pelvic fins while moving the pectorals forward. 6

7. Finlets or Scutes Finlets are small fins located between the dorsal fin and the tail of the fish or also between the anal fins and the tail of the fish. They are only found on certain fish including those in the Scombrid family (mackerels, tunas, and bonitos), Scomberesocid family (sauries), snake mackerels (family Gempylidae), and Bichirs (family Polypteridae).  7

8. Type Of Dorsal Fins The dorsal fins serve to protect the fish against rolling, and assist it in sudden turns and stops. HADDOCK ( 3 dorsal fins) 8

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10. Swordtail Fish MALE & FEMALE SWORDTAIL FISH This species is distinguished by having a medium to large swordtail with a long straight caudal appendage. 10

11. ANAL FIN The  anal  is located on the ventral surface behind the Anus. used to stabilize the fish while swimming. 11

12. GONOPODIUM Fully developed mature male gonopodium in western mosquitofish (Gambusia affinis) The third, fourth and fifth rays of the male's anal fin are formed into a tube-like structure in which the sperm of the fish is ejected. 12

13. Adipose fin The  adipose fin  is a soft, fleshy fin found on the back behind the dorsal fin and just forward of the caudal fin. Adipose fin of a trout 13

14. Lion Fish fan-like pectoral fins long, separated dorsal spines 13 dorsal spines 10-11 dorsal soft rays 3 anal spines 6-7 anal soft rays venomous spiky Fin rays.   (Pterois volitans) 14

15. Stingray Dorsal and caudal fins absent , Pectoral fins joined to side of head. The flattened  Pectoral fins  disc is diamond-shaped and slightly wider than it is long, with narrowly rounded outer corners. The Tail is slender and whip-like . ( Dasyatis pastinaca ) 15

16. flying gurnard The dorsal fin has seven spines and nine soft rays . The anal fin has no spines and six to seven soft rays. Rounded Pectoral Fins  having many dark spots and a bright blue edge . (Dactyloptena orientalis) 16

17. References: Abby , April 25, 2014 ( https://fishionary.fisheries.org/finlets/ ) Aquaviews, Fish Identification Guide: Fish Anatomy (Part I) ( https://www.leisurepro.com/blog/explore-the-blue/fish-identification-guide-fish-anatomy-part/ ) Slide share, Published on Jul 22, 2016, Fish fins ( https://www.slideshare.net/aminajann/fish-fins ) The National Wildlife Federation, Flying Fish, ( https://www.nwf.org/Educational-Resources/Wildlife-Guide/Fish/Flying-Fish ) Kapoor BG and Khanna B (2004)  Ichthyology Handbook  pp. 497–498, Springer Science & Business Media.  ISBN   9783540428541 .   Frogfish Factsheet   Archived  2007-10-11 at the  Wayback Machine   Shedd Aquarium Explore by Animal 2009 17

18. THANK YOU FOR YOUR ATTENTION 18