Sept 8

Sept 8 - Topography and Fin Position -Paired fins -pectoral

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Topography and Fin Position -Paired fins -pectoral – spiny-rayed/advanced fishes and soft-rayed/lower fishes -pelvic – in spiny-rayed fishes, located toward front of body; in soft-rayed fishes, located near middle of body -Median fins -dorsal – (two in spiny-rayed fishes, one in soft-rayed fishes) -anal -caudal -Occiput – sometimes clear to allow sunlight to reach the brain -Nuchal region – males sometimes bulge this region during mating season -Isthmus – strip of skin that holds the head on -Breast – between isthmus and pelvic fin -Belly – between pelvic fin and anal fin -Caudal peduncle – “handle of the fish” -Lateral line -Gill opening/ operculum -Vents of anus – anterior to anal fin -Cloaca – one opening (anus) -Urogenital opening -Adipose fins – not found in most fishes (catfish have them) they are more fleshy ( not found in most fast moving fish) External Features – Fins -Paired and unpaired fins are supported by the appendicular skeleton
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Sept 8 - Topography and Fin Position -Paired fins -pectoral

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