| | Harmful Aquatic Hitchhikers: Crustaceans: Spiny Water Flea and Fishhook Water Flea |
 | | As two of the lesser known hitchhikers, the spiny and fishhook water fleas are part of group of animals known as crustaceans that include crabs, shrimp, crayfish and lobsters. |
 | | Although these water fleas are relatively small, (average length is scarcely more than one centimeter 0.4 inch), they can have as profound an effect on an ecosystem as a larger invader. |
 | | Studies indicate spiny water fleas adversely affect the growth rates and survival of young fish, due to the competition for food and experts believe the fishhook water flea will have the same effect. |
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