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Results 1 to 10 of 10
  1. #1

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    Default Friday Fish Factoid #3


    1 Not allowed!
    I won't ruin your fond memories of Disney movies with this one.. but I will start it with a Riddle!

    How are Fish and Trees Alike?


    The answer is Age rings!

    Fish scales show the age growth of fish in rings just like trees show their growth in age rings! Biologists can (and often do) use this method to determine the age of a fish.

  2. Default


    0 Not allowed!
    Cool. I didn't know that tho I wonder how they would age a scaleless fish? Teeth?

  3. #3

    Join Date
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    Have another Rummy for 12,000 posts ;) - steeler58 Thanks for the rep - mommy1 Medicine for what ails you. - Taurus cheers! - RiversGirl For passing yet another member ;-) - steeler58 
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    Default


    0 Not allowed!
    Again i learned something new from the FFF...thanks!
    10 Gallon Beginner Tank... Journal

    40 Gallon Breeder: ... Journal

  4. #4

    Default


    1 Not allowed!
    When I worked for the Ministry of Natural Resources back in the day, one of my summer jobs was to record the ages of pickerel/walleye via scales. Didn't take long to get squinty-eyed doing that! Tho I did get to use a microscope to do it.

  5. Default


    0 Not allowed!
    A new learning.. Thanks for sharing :)

  6. #6

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    0 Not allowed!
    For scale-less fish, they use the cleithrum - a bone behind the gills. The lines on it indicate age.

    Well, it works for any fish, but scaling can be done on a live fish, whereas the cliethrum is used for dead specimens.
    If you don't want to kill the fish, you have to use the less accurate weight/length to age charts for your area. You can usually find them online.
    Last edited by sheamurai; 02-28-2014 at 03:55 PM. Reason: more info added

  7. #7

    Join Date
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    hopefully this one shows up. - KingFisher It's the closest thing I could find to a snowflake. - Taurus Happy Birthday Girl. Wishing you many more. Ya thats why the Champagne is in play. hehehe - Strider199 For piping up - ~firefly~ Merry Christmas! - ~firefly~ 
    Merry Christmas - Cliff Merry Christmas - gadget228 Thank you and Happy Holidays! - KingFisher Merry x-mas and a Happy New Year Trillianne - Strider199 Happy New Year!!! - Rue 
    Thank you for the birthday wishes. - mommy1 Thanks for the B-Day wish - Strider199 Thanks for the Rep! - steeler1 Thanks, and one for you too. - mommy1 lol - 5 steps to gift giving.  We should eat more bananas... potassium and all that. - KevinVA 
    Here's to one crummy Superbowl, lol! - Slaphppy7 Happy Easter! - Slaphppy7 No Message - Fishhook A Birthday Bunny. - gadget228 Thanks for the rep! :) - Compass 

    Default


    1 Not allowed!
    Quote Originally Posted by pRED View Post
    Cool. I didn't know that tho I wonder how they would age a scaleless fish? Teeth?
    There is an earbone called an Otolith that also grows as age rings however, each fish as their own bone structure so its going to vary fish to fish, and to view it you kind of have a dead fish when you are done. Some fish you can also view some growth rings on their bony structures like fins and spines, but again you pretty much end up killing the fish to find out.

    So scale rings are the least invasive method.

  8. #8

    Join Date
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    hopefully this one shows up. - KingFisher It's the closest thing I could find to a snowflake. - Taurus Happy Birthday Girl. Wishing you many more. Ya thats why the Champagne is in play. hehehe - Strider199 For piping up - ~firefly~ Merry Christmas! - ~firefly~ 
    Merry Christmas - Cliff Merry Christmas - gadget228 Thank you and Happy Holidays! - KingFisher Merry x-mas and a Happy New Year Trillianne - Strider199 Happy New Year!!! - Rue 
    Thank you for the birthday wishes. - mommy1 Thanks for the B-Day wish - Strider199 Thanks for the Rep! - steeler1 Thanks, and one for you too. - mommy1 lol - 5 steps to gift giving.  We should eat more bananas... potassium and all that. - KevinVA 
    Here's to one crummy Superbowl, lol! - Slaphppy7 Happy Easter! - Slaphppy7 No Message - Fishhook A Birthday Bunny. - gadget228 Thanks for the rep! :) - Compass 

    Default


    0 Not allowed!
    Quote Originally Posted by sheamurai View Post
    For scale-less fish, they use the cleithrum - a bone behind the gills. The lines on it indicate age.
    I had not read up on that one! Thanks for sharing your expertise

  9. #9

    Join Date
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    Asking good questions, keep it up! - Slaphppy7 Congrats on the tank move - Slaphppy7 Thanks for being the 2000th poster on the 40B! - Slaphppy7 Thanks for the B-Day wish - Strider199 Here's to one crummy Superbowl, lol! - Slaphppy7 
    T.G.I.F.! - Slaphppy7 Stay warm!! - DeboraBremner Here's to good friends, and new fish! - Slaphppy7 T.G.I.F.! - Slaphppy7 Happy Easter! - Slaphppy7 
    Hey FT, haven't seen your mug around here lately.  Hope everything's ok! - KevinVA 

    Default


    0 Not allowed!
    so how often does it add a line - trees are easy because each ring is 1 year. not sure how it translates to fish
    Current tanks:
    37G FW - 3 Pearl Gourami, 4 Black Mollies, approximately 20+ Molly Fry, 5 Assassin Snails | 10G Planted FW - 14 Molly Fry, rocks, DW and an Anubias Nana - journal
    "We come from the land of the ice and snow" | "I reject your reality and substitute my own" - Adam Savage | What part of "Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn" don't you understand?
    How to cycle without fishies!

  10. #10

    Default


    0 Not allowed!
    same idea...a line equals a year, you just have to careful what you decide to interpret as a line, as the demarcation isn't as evident on fish as in trees.

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