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By Barbara A. Somervill

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See spawning. S. 3OMERVILL writes children’s nonfiction books on a variety of topics. She is particularly interested in nature and foreign countries. Somervill believes that researching new and different topics makes writing every book an adventure. When she is not writing, Somervill is an avid reader and plays bridge.

Somervill believes that researching new and different topics makes writing every book an adventure. When she is not writing, Somervill is an avid reader and plays bridge.

Php To discover why these ancient fish are a threat to some freshwater habitats ANIMAL INVADERS: S L 31 I hatching, 10, 13 Henry I, king of England, 12 adulthood, 8, 9, 12, 13 alewives, 20–22 aquaculture, 19, 20 infestation, 14–15, 16 invasive species, 5, 26 carp, 19 ciscoes, 5, 19, 20, 22 color, 8 conservationists, 6, 26 control, 22, 23–27 damage, 4, 5, 18–19, 20 ecosystems, 6, 20 eggs, 10, 26 Erie Canal, 14, 15 females, 9, 10, 25, 26 fertilization, 10, 26 Finger Lakes, 13 fisheries, 6, 19–20 Fisheries and Oceans Canada, 23 freshwater, 9, 12, 13, 14–15, 22 gill pouches, 9 Great Lakes, 4–5, 5–6, 12, 13–14, 15, 16, 17, 18, 19, 20, 21, 22, 24 Great Lakes Fishery Commission (GLFC), 23, 24, 26 habitats, 6, 16, 28–29 A Lake Champlain, 13 Lake Erie, 4–5, 15, 16 Lake Huron, 16, 20 Lake Michigan, 16, 20 Lake Ontario, 13–14, 15 Lake Superior, 16, 19, 20 larvae, 9, 10, 11–12, 16, 23–24 length, 8 locks, 15 males, 9, 10, 26 mating.

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