Fish_lecture_for_angel_3-1 - Fish Fossil evidence indicates...

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Fish
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Fossil evidence indicates that fish developed in the Ordovician period about 425 to 500 million years ago. Known as Ostracoderms . Were slow, bottom dwelling, covered with thick bony plates and scales, had poorly developed fins and did not have jaws. They are believed to be the first animals with backbones.
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Fish Anatomy
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Bony fish : finned vertebrate animal with skin covered with scales and lives in water. : seat of the mental faculties of a fish. Esophagus : part of the digestive tract connecting the mouth to the stomach. : vessel in the back that carries blood from the heart to the organs. Stomach : part of the digestive tract between the esophagus and the intestine. : helps fish float upright, in one place, without sinking.. Spinal cord : part of the nervous system that connects the brain to all other parts of a fish. Kidney : blood-purifying, urine producing organ. Urinary orifice : opening for eliminating urine.
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Genital Orifice : opening related to the genital organs. Anus : end of the digestive tract. Gonad : hormone-secreting sexual gland of a fish. Intestine : last part of the digestive tract. : cul-de-sac related to the intestine. Gall bladder : small sac containing the bile. : bile-producing digestive gland. Heart : blood-pumping organ. : respiratory organ of a fish. Tooth : hard organ of a fish used to shred food. Eye : sight organ of a fish. : bulging part of the sense organ of smell of a fish.
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There are 4 types of ________________found on fish. Placoid – found on sharks an rays Ganoid – found on Bowfin ( Amia calva ), paddlefishes (Polyodontidae), gars (Lepisosteidae), and sturgeons (smooth) and (serrated edge) – are found in the majority of bony fishes. The anterior part of each scale is usually overlapped by the posterior portion of the scale in front. Most aquarium fish. Cosmoid – found on lungfishes
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Scales show that indicate periods of growth. Rings that are farther apart occur when the fish grows well and there is lots of food - in the ____________ season. Rings that are close together occur when the fish does not get much food and grows . On the scale you can identify the growth and the growth. (There will be several rings in each).
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Fish skin contains glands that produce a slimy mucus which makes the fish slippery and protects it from bacteria. The skin contains __________________(chromatophores), which give fish their color – 3 types. Melanophores – black, browns and . Xanthophores – red, and orange Iridophores – reflect light – produce silvery shine Most fish have coloration that allows them to blend into their environment. Many fish are able to their color if necessary. The skin also contains__________________________.
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__________line – Under these scales are a system of fluid- filled canals and specialized cells which transmit vibrations to the . The lateral line helps fish to detect objects including predators and prey.
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Most fish have __________fins – webs of skin supported by bony or cartilage rods
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Most fish will have at least fin on the back, a single anal fin and a single tail fin. Some aquarium fish have been selected for other types of tail fins.
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