Frank, My guess is that it occurs when 2 fish spar & start the 'mouth gaping' ritual. Apparently they can overdue it & lock up their jaw. Sort of like throwing out a shoulder by throwing a ball too hard. Mike Wise Frank O'Carroll wrote: > Do you think that these jaw injuries happen due to lip-locking style fighting? > > Frank > > ------------------------------------------------------------------------- > This is the apistogramma mailing list, apisto@listbox.com. > For instructions on how to subscribe or unsubscribe or get help, > email apisto-request@listbox.com. apisto-digest@listbox.com also available. > Web archives at http://lists.thekrib.com/apisto ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto