Fish: A Quick Course in Ichthyology
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Description: Introduction to the study of ichthyology and the characteristics of fish presented by Jason Buchheim.
FISH, a quick course on the biology of fishes (Ichthyology) List all the defining features of fish. Are any of these defining features representatives of fish and only fish? Can you think of any other animals that have these features, or can you think of some fish that don't? Worldwide, there are over 22,000 species of fish, comprising more than 50% of all vertebrate species. The origin of fishes dates back to over 480 million years. Fish evolved in fresh water; the chondrichthyes moved to the sea early in evolution, while the bony fishes went through most of their evolution in fresh water and spread to the seas at a much later period. Fish are the dominant free swimming animals of the seas. The structure of a fish body is designed for ease of movement. This ability to move about easily, without relying on water currents to carry them about, has enabled fishes to exploit most parts of the world's oceans, and this is reflected in an extraordinary variety of sizes and shapes. Fish are found in both fresh and salt water worldwide, and are a very important food source for many nations.
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| Page title: | FISH, a quick course on the biology of fishes (Ichthyology) |
| Keywords: | SCUBA,dive,diving,marine science,marine biology,oceanography,coral reef,fish ecology,education,research,conservation,sail,sailling,PADI,training,courses,British Virgin Islands,teen,camp,college,academic credit,adventure,leadership training,academics,water skiing,windsurfing,boating,Sunsail,beach,invertebrate,vertebrate,exploration,naturalist,PADI,reach,cruise,travel,maddog,scholarship,scientist,yacht,discovery,rainforest,biodiversity,instructionwreck,night,navigator,deep,behavior,rescue,divemasterseamanship,regatta,racing,Tortola,St. John,Cayman,photography,videography,coral reef,sun,fun,water,tour,trip |
| Description: | A quick course in Ichthyology presented by Odyssey Expeditions Tropical Marine Biology Voyages |
| IP-address: | 67.223.226.174 |