Picture showing the trout's teeth and tongue with hyoid teeth.
Initial dissection of trout showing the heart, which is closest to the head of the fish and is dark red, the liver and the intestines.
Backbone of trout specimen.
Dissection of the gill. Three compressed gill arches are revealed below the operculum.
For more information concerning the gill and its function, click on the image and scroll down to "In that case, how does gas exchange occur?"