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21 terms

Sci 5 Vertebrates-Fish Vocabulary List

21 Terms including Fish Anatomy
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Vertebrates-
animals with a backbone; They all have bilateral symmetry and endoskeletons
5 Classes of Vertebrates:
Fish, Amphibians, Reptiles, Birds and Mammals
Fish-
the largest group of vertebrates- 25,000 species; have been on Earth 500 million years; first vertebrates to evolve
Three groups of fish:
jawless, cartilaginous and bony
Fish Common Characteristics
All are aquatic, cold-blooded, breathe with gills and have scales
Ichthyologists-
scientists who study fish
Fusiform-
a body form that is compressed at the sides and tapered at the tail making it easy to glide through the water
Dorsal-
along the top or back
Ventral -
underneath side
Lateral-
side of the fish
Fins
a membrane supported by rays or spines that function in swimming or orientation in the water
Types of Fins
Dorsal fins, Anal fins, Pelvic fins, Pectoral fins, Caudal fin
Gills-
feathery structures located on the sides of the head that removes oxygen from the water and allows it to enter the blood
Gill rakers-
function is to keep food out of the gills
Operculum-
bony plate covering the gills; function is to draw water over the gills
Lateral line-
a row of tiny holes in the skin that begins behind the gill cover and runs along the side to the tail; helps the fish feel movement in the water
Scales-
all fish have scales to protect their bodies; fish can be classified according to the shape and characteristics of their scales
Swim bladder-
most fish have this "air" bladder to help move up and down in the water
Mouth-
the location, shape and size of the mouth can be a good indicator of what the fish eats and where it lives
Barbells-
some fish have these "whisker-like" structures to aid in feeling and can be covered with taste buds
Nostrils (nares)-
are not for breathing; nares allow the fish to smell things in the water