Unformatted text preview: turning movements. The pectoral and pelvic fins act as hydroplanes and control the pitch. The tail fin contributes to the forward thrust. Fish other than those in the shark family have an air bladder just below the vertebral column. This increases the buoyancy of the fish and prevents it from sinking when it stops swimming. The pressure in the air bladder can be adjusted for changes in depth. Shark (Note the separate gill slits) Not all fish are as streamlined as the shark. The sea horse has a rigid body and swims by undulatory movements of its dorsal fin Sea horse (not to scale) dorsal fin © D.G. Mackean...
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This note was uploaded on 11/29/2011 for the course BIO 218 taught by Professor Young during the Fall '11 term at BYU.
- Fall '11