Life cycle: Females and males possess 3 life-history stages (instars), differing by number of spines (barbs) on the caudal process (posterior part of the reproductive structure). Pangle, K.L., S.D. Peacor, and O.E. The spiny water flea’s life cycle has rapid and unique reproductive strategies. Accessed on 05/31/2013. A species profile for Spiny Water Flea from USDA, National Invasive Species Information Center. SPINY AND FISHHOOK WATER FLEAS J. Lindgren, Minnesota DNR Dr. During the summer, when water temperatures are warm, spiny water fleas at each instar stage can reproduce without fertilization occurring (parthenogenesis). I. Known Spiny Water Flea Locations and Habitat. B. longimanus, commonly referred to as the spiny waterflea, is an invasive crustacean zooplankton in the Great Lakes region of North America and areas of Europe.Its native range encompasses large areas of northern and central Europe and Asia. Bythotrephes longimanus (also Bythotrephes cederstroemi), or the spiny water flea, is a planktonic crustacean less than 15 millimetres (0.6 in) long. Like other water Thought to have arrived in ballast water, it rapidly spread throughout the Great Lakes. Summary of Invasiveness Top of page. The spiny water flea was first found in North America in 1984 in Lake Huron. It was confirmed in Lake Ontario and Lake Erie in 1985, Lake Michigan in … 2007. Johannsson. These findings suggest that water clarity and turbidity play an important role in the establishment of SWF as well as supports its distribution in clear, oligotrophic lakes (Pangle & Peacor, 2009). Spiny and Fishhook Waterfleas. 2003). Accessed on 05/31/2013. A. Grigorovich, University of Windsor COMMON NAMES: Spiny Water Flea or Bythotrephes (left), Fishhook Water Flea or Cercopagis (right) SCIENTIFIC NAME: Bythotrephes spp and Cercopagis pengoi Both water fleas are … http://www.invadingspecies.com/invaders/invertebrates/spiny-and-fishhook-waterflea/. It is native to fresh waters of Northern Europe and Asia, but has been accidentally introduced and widely distributed in the Great Lakes area of North America since the 1980s.

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