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I have heard my Dwarf Bristlenose Plecos make a kind of croaking sound, especially when I have had to prod them out of there hiding places in there piece of driftwood, when I want to take it out of the tank.
My pleco will make suck-click noises when I've netted him. Heh heh I guess it's his way of letting me know, "I do not like this one bit, now put me back before I'm forced to Sluuuurrrrrrrrp-ClicK you to death." LOL gotta love my Pleco
I havn't heard my peco make sounds. But man o man my Bala shark talks to me just like a dolphine. I love it when they do the sounds. You can hear them for 20 feet away. They will will talk to me when I have blood worms fom along way off they see me and start talking waitting for the blood worms.