The following data are provided for each species in the online searchable database:
Species, genus, family, order, taxonomic authority, commonly-used synonyms, English and other common names (if any), and taxonomic notes (if needed, normally used to clarify difficult or confusing issues). Taxonomic disputes are settled by the appropriate Specialist Group, and only depart from this in well-justified circumstances.
General text information on: geographic range, population (usually a subjective assessment of abundance in the absence of quantitative information), habitat and ecology (including both breeding and non-breeding habitats, and breeding strategy [i.e., larval development, direct development, viviparous]), major threats and conservation measures (in particular noting occurrence in protected areas).
Unlike non-freshwater species, the extent of occurence (EOO) is usually based on the area of the catchments within which the species is found. Where possible, the area of occupancy (AOO) will be reduced from this value based on known range and suitable habitat. For restricted riverine species, the AOO may be based on the length of river in which the species occurs.
Based on the information above, the following is determined: IUCN Red List Category, IUCN Red List Criteria, Rationale for the Red List assessment, reason for any change from previous assessments (i.e., genuine change in status of species, new or better information available, incorrect information used previously, taxonomic change affecting the species, previously incorrect application of the Red List Criteria), current population trend (i.e., increasing, decreasing, stable, unknown), date of assessment, names of assessors, and any notes relating to Red Listing (e.g., any important issues in deciding the Category).
A geographic distribution map of the range for each species. Maps are missing for species that are known only from non-specific type localities. Species are mapped to river catchments and lake boundaries, to levlel 6 sub-catchments of the USGS Hydro 1k layer. The maps are in the form of polygons that join known locations. A species' distribution map can consist of more than one polygon where there is an obvious discontinuity in suitable habitat.
As well as the map included with each individual species account, the individual shapefiles (.shp) will be available for download soon.
A list of countries of occurrence is given, noting whether it is native extant, extinct, introduced and/or re-introduced.
Each species is coded against a standardized list of habitats, the IUCN Habitats Classification Scheme, and coded for suitability and relative importance.
Each species is coded against a standardized list of threats, the IUCN Threats Classification Scheme, and coded for whether the threat is acting in the past, present or future, or is an ongoing threat.
Each species is coded against a standardized list of conservation actions, the IUCN Conservation Actions Classification Scheme, and coded for whether this measure is "In Place" or "Needed".
Each species is coded against the IUCN Utilization Authority File (focusing on the purpose/type of use, the primary forms removed from the wild, and the source of specimens in commercial trade).
A listing of important references for each species.