Yup, I laughed when my hubby was bit by his fish. I tried not to and I asked if he was okay (he said he was). He was trying to put a sponge over the filter to protect the babies that just hatched (they weren't free swimming yet). We didn't know we had a male and female jaguar cichlids (we got them when they were tiny). The male was relentless and hearing my hubby say, "Ouch you little bastard" made me laugh harder. He said it really didn't hurt. That it felt like a pinch. He told me to try it, so I put my hand it. He wouldn't bite me. So, I don't know if fish can smell pheromones and can tell my hubby is a male or what.