Ecological Risk Screening Summary - Ide (Leuciscus idus) - Uncertain Risk

Species that are considered uncertain risk need a more in-depth assessment beyond the Ecological Risk Screening Summary to better define the species’ risk to U.S. environments.

Leuciscus idus, Ide, is a fish that is native to northern Europe and Asia. This species is a riverine species that can also live in brackish areas. As adults, they eat smaller fish. L. idus is commonly used as an ornamental fish for ponds. Escape from these ponds into the wild during flood events is a common means of introduction. Historically, L. idus was provided for intentional stocking by the U.S. Fish Commission. This species may carry Koi Herpesvirus, a disease listed by the World Organisation for Animal Health. L. idus is regulated in 16 states with three of them regulating the entire genus. L. idus has been introduced in the United States and New Zealand, and outside its native range in Europe. In Europe and New Zealand, those introductions resulted in established populations. The status of this fish in the United States is more uncertain, with no evidence found for extant established populations. The History of Invasiveness for L. idus is classified as Data Deficient due to no information being found regarding documented impacts from introductions. The climate matching analysis for the contiguous United States indicates establishment concern for this species. Areas of high match were found within the Great Lakes, portions of the Mid-West, Great Basin, and Colorado Plateau. The Pacific Coast, Desert Southwest, and Florida had low matches. The Certainty of Assessment for this ERSS is classified as Low mainly due to there being a lack of information on documented impacts or lack of impacts from introductions. The Overall Risk Assessment Category for Leuciscus idus in the contiguous United States is Uncertain.