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Mud crabs - full or empty?
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Thread: Mud crabs - full or empty?

  1. #1
    Ausfish New Member
    Join Date
    Jun 2006

    Mud crabs - full or empty?

    On page 27 of this months' QFM magazine there is a picture of a large mud crab and the caption says it is being thrown back as it was 'empty'.

    How do you tell if a crab is full or empty?

  2. #2

    Re: Mud crabs - full or empty?

    G'day
    Tap the back of the shell and they will sound holow, also just judge the weight and you will know.
    Dave
    PRECISION DETAILING
    For all your MARINE DETAILING needs
    www.precisiondetailing.com.au
    0421802691

  3. #3
    scottv50
    Guest

    Re: Mud crabs - full or empty?

    They will either feel heavy for their size and then they are full, or they will be light and empty. When it gets a bit warmer we will start to get the full ones again!

  4. #4
    marlinqld
    Guest

    Re: Mud crabs - full or empty?

    push down on the shell with one finger in the middle of the back.

    The shell will give and push in if it is empty.

    If it is full it wont give under the presuure of the finger


    Mike

  5. #5
    Far_Canal
    Guest

    Re: Mud crabs - full or empty?

    emtpy crabs are nice clean and green.

    full crabs are dirty mongrels

  6. #6

    Re: Mud crabs - full or empty?

    Cut it in half.

    Sorry...

    I usually judge by the tip above. Colour, weight and sound when tapped.

  7. #7
    Far_Canal
    Guest

    Re: Mud crabs - full or empty?

    another method is by pressing in on the shell on the underside of the shell, difficult to explain, but its about an inch either side of the eyes but on that underside part, so when u do it (if ur game enough) ur fingers will be between the start of the arm (claws) on the underside of the shell.

  8. #8
    Ausfish Bronze Member
    Join Date
    Jul 2006

    Re: Mud crabs - full or empty?

    Colour.. Yes
    Green.. Usually empty
    Rusty Brown... Usually full
    If u squeeze under either side at the extremities of the body at the outer spines (where u measure them) it gives a good idea....Soft - empty
    solid - full

    (stress the usually)


  9. #9
    Ausfish Bronze Member
    Join Date
    Jun 2006

    Re: Mud crabs - full or empty?

    agree with gafym! if the crab is green it'll usually be empty, if it's a good chocolate brown colour it'll be full as a goog!

  10. #10

    Re: Mud crabs - full or empty?

    colour and weight the guys have summed it up

  11. #11
    Ausfish Bronze Member
    Join Date
    Aug 2005

    Re: Mud crabs - full or empty?

    A couple of pro crabbers noth of Cooktown told me the following:-
    A crabs shell softens seasonally to allow the crab to grow, naturally a hard shell will not grow.
    Once the crab comes out with new clean green shell, it is totally empty or as good as.
    The shell is soft in many areas. some mentoned above but the main one they advised was under the shell next to the last leg. Just push gently in this area, if there is inward movement, the crab is empty.
    Look for wear and tear on the claws, if they are feeding, they are filling.
    It is a combination of things. the new shell discolours and hardens at the same rate as they fill with meat.
    As state above, generally the dirtier the colour, the harder the tell tale areas of shell, the more scrathes on the claws from feeding/fighting, the heavier the crab feels for it's size, the fuller the crab

  12. #12
    Ausfish New Member
    Join Date
    Jun 2006

    Re: Mud crabs - full or empty?

    My thought was that for a crab of that size, there must be a fair amount of meat carried forward from its previous shell, even though the new shell is obviously bigger.

    The comments on the changing of colour are helpful thanks. I'm more than a little wary of handling them at the moment.

    It would be interesting to be able to see the process of the change of shell.

  13. #13

    Re: Mud crabs - full or empty?

    I've always found the brown maltese cross on the underside of the crab to be a very good indicator. If the cross is there or partially there then you have yourself a good crab. The only exception to this that I've found is that some crabs caught in really sandy areas can be clean underneath but still full. Also if you crab a bit you get to know what weight a full crab should be just by feel. Hope this helps.
    Cheers
    Dave

  14. #14

    Re: Mud crabs - full or empty?

    Squeeze the underside or the tips of the legs. You will fell a slight give if the crab is empty

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