Mouth parts of a Tench fish, photograph

The mouth parts of a tench fish, or doctor fish, dissected to show the teeth on the surface of the upper jaw, and the horny pad on the lower jaw onto which they bite. Tench are a fresh water fish and member of the carp family, found throughout Eurasia. They dwell in muddy and weeded areas of lakes, feeding on bottom invertebrates and insect larvae. They have adapted to living in mud during winter,…