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Odd guppy fry behavior


DAFishguy
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Just witnessing something I've never seen/heard of before. I have a guppy birthing in a homemade breeding box floating in a tank containing fry about 2 weeks old. One of the older fry keeps making his way into the box and picking at the female. Almost like discus fry would. The female only tries to get away if the picking is near her vent. Older fry seems to have no interest in previously born or even those being born. I've chased it out/removed it several times but just comes back again. Anyone else run across this? 

FYI I just recently got back into fish again after about 12 years away but in my prior 20+ years of keeping/breeding/working in a LFS never seen this.

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I have. They see things we dont. I had fry do that to a very stressed female during a tough delivery. 7 week old juveniles picking at her tail. Using high power magnifying glass she had the beginnings of fin rot. I assume they saw bacteria or something.

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