Biological Removal

Autocidal methods

Mating in spiny-cheek crayfish (Orconectes limosus).

Photographer: Astacoides (CC BY-SA 3.0)

One method by which invasive crayfishes might be successfully managed is through the use of autocidal methods, such as through the release of sterile males (Gherardi et al., 2011). Sterile male releases involve the propagation and subsequent release of reproductively sterile males into the wild. The premise is that the sterile males will mate with viable, wild females, but the females will produce infertile eggs as a result of the male sterility. While these methods have proven successful in reducing the abundances of some insects (Balestrino et al., 2016) and aquatic vertebrates (Twohey et al., 2003), laboratory testing on crayfishes has been limited (Aquiloni et al., 2009), and it is uncertain if autocidal methods will be effective on established invasive crayfish populations with high densities.

Predator manipulation