clown fry catching

Discussion in 'General Discussions and Advice' started by Neil H, 8 Sep 2009.

  1. Neil H

    Neil H Moderator MASA Contributor

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    Hi Hennie

    In your article on rearing clown fish, the method of catching the fry, i followed to a T....... however after 2 or 3 hours i only managed to catch an estimated 15 or 18 of the fry, i would guess there was easy 100 eggs.... thats a dismal success rate for me......

    any tricks you can give me like type of torch?
    can i use a brine shrimp net to catch the fry or would the net damage the fry?
    any thoughts would be hugely welcomed !!:thumbup:

    rgds

    Neil
     
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  3. Reef Maniac

    Reef Maniac MASA Contributor

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    Hi Neil.

    That does not sound right - you should have caught at least 50% of them within 10 minutes...

    Just to recap:

    • Ensure that all water flow is stopped before they hatch, and that room and tank are in total darkness
    • Shine a bright light from either above the tank to the area where the eggs were before hatching, or if you're a bit late, and they have dispersed through the tank, shine it through the side pane, just below the water surface - keep the light stationary. (I used a large Maglite torch, which my wife held for me...)
    • The babies should swim towards the surface, and towards the light, congregating in a school close to where the light beam enters the water.
    • Use a glass or plastic bowl or jug to scoop them up from below - move the container very slowly, to prevent a wave caused by the movement from dispersing them.
    You could probably use it to "herd" the babies towards the container, if necessary, buy I'm afraid that it could injure some of them. Removing the babies from the water in the net would not be a good idea.

    There is one other trick you can try, if you become desperate - use a large-diameter flexible pipe (tube) and just siphon them out into a large bucket which is held slightly lower than the tank. Make sure that you first siphon a few litres of water without any fry, just to fill the container somewhat, and then ensure that the discharge end of the pipe remains under that water surface while you "transfer" the babies. Regulate the water speed by lifting the bucket until the water flows very slowly into the bucket.

    Good luck with the next batch.

    Hennie

    PS, have you managed to source any rotifers?
     
  4. Neil H

    Neil H Thread Starter Moderator MASA Contributor

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    thanks for the input Hennie

    I turned the pumps off 30 mins after lights out and shined the torch into the tank 30mins later. I suspect 1 of two things went wrong for me.

    Either the pumps were still on during hatching or I shone the torch in too late either way it seems the fry dispersed.

    this time i will turn the pumps off with lights out and monitor the eggs much more closely !

    I have finally managed to get a starter culture of rotifers which should arrive in the next day or so !!!
     
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