### body part | appendage:

Fin
* All fins exept the adipose fin consist of rays with fin membrane between.
* Most fins have shapes
  - tips
  - move in waves
* Some fins are supported by bones
  - sharp spines
  - conduct heat
* Some fins have bones
  - dermal bones
  - edges
  - limbs
  - tail fins
  - thin bones
  - trail edges
* Some fins look like legs
  - tiny legs
* are locomotion organs
  - most effective when they are in smooth flowing air
  - now among the world's most expensive fisheries products
  - present on the lateral side of the body
* are supported by cartilages
  - radial cartilages
  - the most distinctive features of fish
  - used for directing, stabilizing, or propelling the different fish species in water
  - webs of skin over delicate rays of bone
* can cause deep lacerations and cuts, as well as bruising.
* consist of bony supporting rays with soft webbing tissue between
  - dense, fibrous connective tissue, with no bones
* continue to increase in value as an ingredient in shark fin soup.
* control movement
  - pitch
* enable the fish to swim, turn, stop and remain upright in the water.
* give stability, and control the direction of movement during swimming, as explained later.
* have a longitudinal furrow on their rorquals
* healing after a case of fin rot sometimes show black edges.
* help stabilize and propel the fish in the water
  - or propel the fish in the water
* near backs.
* only work under water.
* perform best when under water.
* propel and stabilize the fish in the water.
* protect gills.
* refer to the presence of fins, pieces of fins or dorsal spines.

### body part | appendage | fin:

Anal fin
* Some anal fins have edges
  - lead edges
* is approximately the same size as the two dorsal fins.

Archaeological find
* confirm the importance of dance to all indigenous people throughout the world.
* reinforce the importance of beads in ancient societies.

Caudal fin
* Most caudal fins have shapes.
* Some caudal fins have fins
* are fins.
* is relatively long and deeply forked with the tips being pointed.

Dorsal fin
* Most dorsal fins have tips.
* Some dorsal fins are near tails.
* Some dorsal fins are supported by sharp spines
* Some dorsal fins have edges
  - trail edges
* break the surface on all sides.
* ranges all the way around the body and merges with anal fin.
* starts one third along the body and joins the anal fin.

Lobe fin
* Some lobe fins look like legs
* are rare among living fish and are only possessed by the coelacanth and lungfish.

Median fin
* are vertical fins on a fish's back, underside, or tail.
* control movement.

Pectoral fin
- larger than pelvic fins, located above the ventral surface and rounded tips
* are long , swept back
  - and slender, typically with dusky tips
  - massive in both length and thickness
  - much longer than the snout length
  - rounded and noticeably larger than the pelvic fins
  - very small
* originate behind the head and extend outwards.

Pelvic fin
* Some pelvic fins are supported by skeletons.
* are a light yellow, almost transparent, whereas the ventrals are almost black
  - half-moon shaped with narrow membranous flanges
  - well developed, and rather narrow, with nine to ten fin rays