FAQ's About the NAS Database

What records do you keep and why?
What type of sources are used to gather data for the NAS database?
Is there more data that I can't see?
Can I request a custom query?
What do the different types of pathways mean?
What is a HUC?
What does "status" mean?
How do I report a sighting/collection of a nonindigenous aquatic species?

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What records do you keep and why?

We keep distribution information from across the country for most aquatic species (freshwater and marine) outside of its native range. Our database contains locality information for more than 1100 species of vertebrates, invertebrates, and vascular plants. Our program provides a continual national repository of distribution information for nonindigenous aquatic species that is used to gain an understanding of aquatic introductions, identify geographic gaps, and assess the status of introduced aquatic species nationwide.

What type of sources are used to gather data for the NAS database?

Data are obtained from many sources including literature, museums, databases, monitoring programs, state and federal agencies, professional communications, online reporting forms, and Aquatic Nuisance Species (ANS) hotline reports.

Is there more data that I can't see?

We display all components of the specimen records for the animal queries, except for people's names and contact information which is hidden for privacy reasons. The plant queries only display the scientific name, common name and state. You can contact us for custom queries if the data are not formatted appropriately for your need.

Can I request a custom query?

Yes, we can do custom animal and plant queries if the data are not formatted appropriately for your need. Please contact us and let us know what you need and we will be happy to work with you.

What do the different types of pathways mean?

Stocked-species was intentionally planted in the new location; i.e., stocked for sport, storage, stock contamination, biocontrol; includes legal and illegal stocking
Shipping-ballast water discharge and/or hull fouling
Aquarium release-species released in the wild by owners who no longer want them; can include escapes from aquaculture especially for locations in Florida since it is often impossible to distinguish between the two pathways in this area
Bait release-species introduced as discarded bait
Aquaculture-species that escaped from aquaculture facilities
Canals-species that gained access to new areas via canals
Pet escape-species that were released by pet owners, used mostly to designate amphibian and reptile escapes

What is a HUC?

Data queries and maps at this website present distributions according to "drainage" in an effort to correlate aquatic species locality data with natural drainage systems as opposed to arbitrary state and county boundaries. We follow a hierarchial drainage classification system developed by the USGS. Referred to as Hydrologic Unit Codes (HUC), this system identifies hydrologic regions of the US at four levels. Our maps employ the 2-digit (HUC 2) at the coarsest level, 6-digit (HUC 6) and 8-digit (HUC 8) the finest level. Mapping in this manner indicates recorded presence of a species from at least one location within a designated drainage, but does not necessarily imply occurrence throughout that drainage.

What does "status" mean?

Status represents the reproductive poulation status of of the species in that particular location and includes the following categories:

Collected-species was collected or observed from the site; reproduction is not known - this is the default status; many of these are actually established populations
Established-population is reproducing and overwintering
Eradicated-population was eliminated by human activity, i.e., Rotenone
Extirpated-population died out on its own, without human interference, i.e., cold winter
Failed-population was stocked but died out; failed to reproduce
Stocked- species was introduced, as opposed to being caught
Unknown- status is not known

How do I report a sighting/collection of a nonindigenous aquatic species?

To report a sighting you can fill out an online report or call the ANS hotline at 877-STOP-ANS (877-786-7267).

Online Report Submission:
  Sighting Report Form

The ANS Hotline is sponsored by the U.S. Fish and Wildfile Service and the U.S. Geological Survey.

Information about Regional Panels of the Aquatic Nuisance Species Task Force or local, State, and Federal aquatic nuisance species contacts can be found online at: http://ANSTaskForce.gov