The Fishes

The Fishes - The Fishes Masters of the aquatic environment...

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The Fishes Masters of the aquatic environment in which they live Plato considered fishes “senseless beings that have been given the most remote habitation as punishment for their pungent ignorance.” Sizes can range from the whale shark (50 ft) to the Philippine Island Goby (just over 1/3 of an inch) Over 21400 species of fish names The number of individual fish is in the billions Oldest of the vertebrates No evidence that they are declining dramatically like the species of amphibians and reptiles, but they are declining Anatomy of a Fish o Swim bladder Gives them the ability to hang in the water column by regulating the gases in the swim bladder o Fins - Used as brakes and rudders to dart and maneuver o Olfaction- good sense of smell and eyesight o Lateral line system Unique system of sensory structures that detect changes in the water and currents o Gills Covered by the operculum Extract oxygen from their aquatic medium o Kidneys Tremendous capacity for osmoregulation Ability for an animal to regulate the salt and water balance within their body’s blood and tissue o Reproduction
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Some have a lot of elaborate types of courtship, nest building behavior, and caring for young External fertilization Some mothers after they are born will keep them in their mouths when danger comes. Anatomy of a Fish o Swim bladder - Gives them the ability to hang in the water o Fins- Used as brakes and rudders to dart and maneuver o Olfaction- good sense of smell o See pretty well o Lateral line system- Sensitive to vibrations and currents in the water. o Gills Covered by the operculum o Tremendous capacity for osmoregulation Ability for an animal to regulate the salt and water balance in their body o Reproduction Some have a lot of elaborate types of mating External fertilization Some mothers after they are born will keep them in their mouths when danger comes. Superclass Agnatha (fishes without jaws) o Characteristics for both classes slender- eel like, Body also rounded soft skin covered my mucous secreting glands and No scales Median fins- dorsal fin and caudal fin, no paired appendages Skeleton cartilaginous
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have a notochord instead of a vertebral column simple digestive system sense organs built around taste, good sense of smell, hearing is also pretty good external fertilization, 1 single functional gonad, separation of males and females o Class myxini- hagfishes Sucker mouth Teeth found on the tongue- to hold and tear into prey Heart- only one atrium and one ventricle Marine in nature Length 79 cm Feed on things dead or dying and analids (segmented worms) No stomach 6 barbells around mouth 5-6 gill pouches No paired fins Isotonic to sea water Body fluid is also 35/1000 water Capture a hag fish within mins they generate a slimy material that is thought to be used in feeding or as a defensive mechanism
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The Fishes - The Fishes Masters of the aquatic environment...

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