rusty crayfish

Post on 23-Feb-2016

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DESCRIPTION

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. - PowerPoint PPT Presentation

TRANSCRIPT

Rusty Crayfish

Orconectes rusticus

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!

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