Nile Cat-Fish

“Nile Cat-Fish, Synodontis

In this cat-fish, as in salmonids, there is an adipose fin. The first ray of the dorsal and pectoral fins is transformed into a hinged, unbranched, serrate spine. The swim-bladder is constricted forming a fore and hind part and the wall of the former is partially ossified and acoustically connected through Weberian ossicles with the ear. The name OSTARIOPHYSI, to which order the carp and cat-fish belong is derived from the form of the hindmost ossicle which is expanded; this is the tripus.”