Go Back   plecoplanet Forums > Articles > Articles > Pleco
Plecoplanet on Facebook

Notices

Reply
 
Thread Tools Display Modes
  #1  
Old 16-04-10, 11:45
bre's Avatar
bre bre is offline
Admin

Tetris Champion, Snake Champion
 
Join Date: Apr 2009
bre's Flag is: Australia
Location: Newcastle, Australia
Fishkeeping Experience: Advanced
Breeding Experience: Intermediate
Posts: 2,571
Gallery: 84
Helpful Posts
Awards PhotoArticlesPOTM Winner
bre is on a distinguished road
FINS AND WHAT THEY ARE USED FOR


Fins, what are they? What they are for? What fin is which?

Most people when they hear the term fin used when referring to a fish, automatically know that that refers to the boney but also fleshy appendages. But what are they called and what are they used for? Well, that is what we are here to discuss.

Each fin has it's own purpose and it's own name.




Lets start with across the top of the body.

The Dorsal Fin.
This is the fin on the top of the fish.
The purpose of this fin is to help the fish maintain it's balance.

The Adipose Fin.
This fin is located behind the Dorsal but before the Caudal or Tail Fin.
Not all fish possess this fin and it is not certain the exact purpose of this fin. It is found more predominantly in fish from high flowing rivers leading some to believe that the Adipose Fin can act like a second dorsal fin. There has been some experimental evidence where the Adipose Fin has been removed from juvenile fish that the removal of this fin has subsequently reduced their swimming abilities in varied flow rates. While others tend to believe that it is a just a piece of useless fatty tissue. I guess this will remain uncertain until some more conclusive studies have been done on the issue.

Now to the lower fins.

The Pectoral Fins.
These fins are paired (meaning one either side) and are placed behind the gills. These fins can become quite hairy (or spikey) and become quite a useful clue in sexing some species of Loricariidae.
They are used to control direction and manouverability.

The Pelvic Fins .
These fins are also paired and placed toward the rear of the body in Plecos, just before the anal fin. In other species of fish these can also be placed almost directly below the Pectoral Fins.
The purpose of these fins is to control the up/down motion of the fish. They are also used by Plecos to "fan" their eggs and Corydora's species can also be used to hold the eggs during spawning.

The Anal Fin.
This fin is located behind the Pelvic Fins and before the Caudal fin. In Plecos these are noticeably smaller than those on most other fish especially Cichlids.
It is also used to help stablise the fish. Although some fish species which have the larger Anal Fin it can be used for propulsion.

The Caudal Fin.
This fin is also called the Tail Fin. It's location is pretty self explanatory being located at the very rear of the fish.
This fin is used for the purpose of propulsion. There are variations in tail shape depending on the species of fish.
There are the long continuous fins that are more commonly found on eels etc. These give the fish the ability to navigate through tight spots with ease.
Then there is the Forked Tail, this is most commonly found on fish that continuously swim.
Fish with rounded tails (like Frontosa) are usually slower but are stronger swimmers.
While fish with a crescent moon shape tail are the type of fish that can swim at speed for a long length of time.
And fish with a more squared tail are also strong swimmers but are generally slower.

Fin Extensions
There are a few species of fish which exhibit this natural trait, for example the Royal Whiptail with it's extended Caudal fin and deepsea fish such as the Tripod fish which uses it's extended Pectoral fins to catch its prey. The actual use of the extended caudal fins is not fully understood. As it is a natural occurance there is some speculation that it is used to attract members of the opposite sex and or to act as feelers while the fish attempts to move backwards. Although there is no evidence to support this.
Tail Extensions also appear on other aquarium fish such as the swordtail or emporer tetra and is used as a way of sexing the fish.
In the majority of Ornamental Fish this has been genetically enhanced for apppearance (eg. Long Fin Bristlenose) which also results in the fish unable to swim aswell as the standard variation of the species.

__________________
Reply With Quote
Did you find this post helpful?
Stanthanked for this post
  #2  
Old 17-04-10, 00:21
Doodles Doodles is offline
 
Join Date: Apr 2009
Doodles's Flag is: England
Location: Kent
Fishkeeping Experience: Advanced
Breeding Experience: Beginner
Posts: 8,786
Gallery: 175
Helpful Posts
Awards Picture of the Month Winner Jan 2011Breeding LogArticlesPhoto
Doodles is on a distinguished road
Good Job, very informative and thank you for writing
Reply With Quote
  #3  
Old 17-04-10, 12:42
macvsog23 macvsog23 is offline
Pleco Profiles Team - RIP FRIEND
 
Join Date: May 2009
macvsog23's Flag is: Cambodia
Location: Bristol
Fishkeeping Experience: Beginner
Breeding Experience: None
Posts: 2,671
Gallery: 1
Helpful Posts
Awards PhotoArticleBreeding Logs
macvsog23 is on a distinguished road
Spot on

I stand in awe again a article of outstanding use.

If only I could get my bum off the seat and write some thing as I am always promising to do

Adipose fin is suspected to be a fat fin in some fish ie a reserve of fat for times were food is scares.

Adipose is Greek for fat I believe?

Regards Bob
Reply With Quote
  #4  
Old 17-04-10, 12:55
bre's Avatar
bre bre is offline
Admin

Tetris Champion, Snake Champion
 
Join Date: Apr 2009
bre's Flag is: Australia
Location: Newcastle, Australia
Fishkeeping Experience: Advanced
Breeding Experience: Intermediate
Posts: 2,571
Gallery: 84
Helpful Posts
Awards PhotoArticlesPOTM Winner
bre is on a distinguished road
Thank you Bob
__________________
Reply With Quote
  #5  
Old 17-04-10, 13:06
Breamlegend's Avatar
Breamlegend Breamlegend is offline
Member
 
Join Date: Apr 2009
Breamlegend's Flag is: Australia
Location: Central Coast NSW Australia
Fishkeeping Experience: Advanced
Breeding Experience: Intermediate
Posts: 1,093
Gallery: 44
Helpful Posts
Awards POTM WinnerReputable Trader
Breamlegend is on a distinguished road
Good work Bre!
__________________
BREAMLEGEND
formerly Ancistrus
Still making custom slate caves pm me or check my thread http://www.plecoplanet.com/forum/showthread.php?t=5079


Reply With Quote
Reply

Bookmarks



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump




All times are GMT +1. The time now is 12:38.

Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.

Designed by: vBSkinworks