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Rusty Crayfish Orconectes rusticus Current Distribution Background • Originated in the Ohio River Basin, Kentucky and Ohio. • Introduced to Wisconsin in the early 1960’s. • Spread through use as fishing bait, educational purposes, pets. • Inhabit lakes, ponds, streams, and rivers. • One female possessing sperm and eggs start a population. Typical Decapoda(order) Life Cycle Egg bearing Female Male and Female Arrow points to the gonopod legs on a male. Seminal receptacle found on females. Negative environmental impacts • Displace native crayfish species. - Food consumption - Disrupt reproduction cycle - Destruction of ecosystem - High growth rate Native Orconectes obscurus Negative Economic impacts • Reduction of sporting species • Decreased recreation usability • Aquatic maintenance costs Sparkling Lake, Wisconsin Sparkling Lake, Wisconsin Control Methods • Chemical control methods • Seasonal Harvest • Combination fishing restriction and trapping • Don’t introduce in the first place Typical Traps Prevention • Education of the threats • Mandatory washing and cleaning of equipment. • Check points • Implementation of laws - PA law makes its illegal for anglers to posses, aquarists to raise, and bait dealers or pet traders to sell O. rusticus. Identifying characteristics Don’t Use Me For Bait!