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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. #2

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

  3. #3

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    Again i learned something new from the FFF...thanks!
    10 Gallon Beginner Tank... Journal
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  4. #4

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    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. #5

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    A new learning.. Thanks for sharing :)

  6. #6

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    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 04:55 PM. Reason: more info added

  7. #7

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    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

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    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

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    so how often does it add a line - trees are easy because each ring is 1 year. not sure how it translates to fish
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  10. #10

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    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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