Mouth
The location of the mouth on the head (ie,
more ventral, terminal, or dorsal); presence of
jaw teeth and/or pharyngeal teeth (teeth located
in throat region of many types offish) ; and
overall structure of the oral cavity can differ
significantly, depending on type of food/prey
eaten. Some species, including many African
cichlids, arowana (Osteoglossum and Scleropages
spp.), and jawfish (Opistognathus spp.) use their
mouth to brood developing eggs or fry. The
mouth may also be used for nest building and
for territorial or breeding displays or fighting.