Aug 29

Aug 29 - Fish Diversity-Fishes presence on earth predates man’s by more than 500 million years and all other vertebrates by 00 million years-many

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Unformatted text preview: Fish Diversity-Fishes presence on earth predates man’s by more than 500 million years and all other vertebrates by 00 million years-many structures and ways of life found in higher vertebrate originated in fishes:-basic ground plan-sight-internal fertilization-intrauterine nourishment, including placenta-live birth-learning-memory-Fishes are not only diverse, but come in many different sizes and shapes-most fishes are fusiform (torpedo-shaped) in shape-Fusiform – streamline configuration with an elliptical to round cross-section and narrow caudal peduncle (Scombridae-tuna and mackerel)-Compressiform – similar to fusiform, but considerably more laterally compressed (sunfishes, snappers, porgies, and flounder)-Depressiform – flattened dorsoventrally (skates, angel sharks, toad fish, goose fishes) – live on bottom-Anguilliform – eel-like fishes, elongated bodies, blunt or wedge-shaped heads, tapering or rounded tails, small or absent paired fins, long dorsal and anal fins (eels, loaches, hagfishes)...
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This note was uploaded on 09/18/2008 for the course RNR 4145 taught by Professor Rutherford during the Fall '08 term at LSU.

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Aug 29 - Fish Diversity-Fishes presence on earth predates man’s by more than 500 million years and all other vertebrates by 00 million years-many

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