Like birds, if a fish is spooked I expect they will jump. My cockatiel will go nuts once in a while if you walk past his cage at night. And of course my goby has sump surfed several times, jumping right into the overflow, always at night. I expect a snail stumbled across his burrow and he flipped right out, I'm just glad I've never found him dried up on my eurobracing. Occasionally I see him in the morning before the lights are on, cowering in a corner, looking like he's just seen the devil himself or something. I don't think a fish needs "enemies" to jump.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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