Introduction of invasive species of plants, animals, crustaceans and even microorganism into an environment has a tremendous negative effect on that ecosystem. Non-native species can have huge negative impact on the overall biodiversity and the ecosystem’s health.
Crayfish are freshwater benthic omnivores that are important in the lentic ecosystem (Nilsson, E, et al, 2012). Nilsson et al, looked at how the Rusty crayfish that are native to the Ohio River valley in North America are dispersing rapidly to other lakes and becoming an invader.