This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources. Find sources: "Calypso Ichthyological Database" – news · newspapers · books · scholar · JSTOR (August 2011) (Learn how and when to remove this message) The topic of this article may not meet Wikipedia's general notability guideline. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted. Find sources: "Calypso Ichthyological Database" – news · newspapers · books · scholar · JSTOR (August 2011) (Learn how and when to remove this message) (Learn how and when to remove this message)

The Calypso Ichthyological Database numbering system is an open source free repository allowing the unique identification numbering of all fish species with a six-numeral fixed number. This number remains the same throughout any alterations or taxonomic changes to the species' accepted current scientific name and allows for recording of species data in 32 unique data fields including all previous names in 32 languages. It has been in use since 1994 and was pioneered by its inventor, Gerald H. Jennings, with the technical assistance of Terry Hall. It is accompanied by a vast photographic library of fish species and is free at the point of use to all researchers and academics. Much of the data is also available in published format and online.

• Hall, T.R. and Jennings, G. (1996) The Calypso Ichthyological Database. Calypso Publications. ISBN 0-906301-47-5

• Ichthyology terms