Guides and Keys to Larval and Early Juvenile Fishes
The following PDF files and compressed folders (data sets) are, respectively, early life stage identification guides and computer- interactive keys to the catostomid and (or) cyprinid fishes of the Upper Colorado River Basin, Gila River Basin, and Pecos River and Rio Grande Basins, as well as a key to the families of fishes in the Gila River Basin and a draft early life-stage key to the families of fishes in U.S. and Canadian fresh waters. The key data-sets require and are accessed by the host computer-interactive key program DELTA-INTKEY, either installed on your computer (instructions follow) or run from a portable memory (e.g., CD or USB flash drive ) or online source. In use, the keys can be limited to consider only selected taxa or taxa in predefined regions or basins (e.g., in the Upper Colorado River Basin cyprinid key, only species in the Yampa River or the genus Gila, or in the North American family-level key, only families found in Upper Colorado River Basin or Great Lakes region).
To use the keys:
- Download, extract, and configure the INTKEY without cost as instructed from the DELTA-Intkey website. All will be housed in a home directory of folder labeled “Delta”.
- Download one or more of the larval fish keys below. These are compressed folders of data-set files and subfolders for use by the Intkey program. Decompress them as data-set subfolders in your Delta folder (e.g, under C:/Delta if the Intkey software was extracted as a root directory on computer’s primary hard drive).
- Start the INTKEY program (click on “Intkey5.exe”) and “Select data set” by browsing the subfolder where the desired kay data sets are stored and selecting the key startup file which will have the file-name suffix “ink” (e.g., Intkeyxx.ink). The folder name of each key data set below is shown below in italics.
Gila River Basin
Snyder, D. E., K. R. Bestgen, and S. C. Seal. 2005. Native cypriniform fish larvae of the Gila River Basin- morphological descriptions, comparisons, and computer-interactive keys. Final report Colorado State University Larval Fish Laboratory to the U.S. Bureau of Reclamation, Phoenix, Arizona. Contribution 143 of the Larval Fish Laboratory, Colorado State University. (109 MB)
Key to the Catostomids (639 KB). Intkey data set name = cat-grb
Key to the Cyprinids (686 KB). Intkey data set name = cyp-grb-r
Key to the Families (475 KB). Intkey date set name = fam-grb
Pecos River and Rio Grande basins
Brandenburg, W. H., D. E. Snyder, S. P. Platania, and K. R. Bestgen. 2018. Cyprinid fish larvae and early juveniles of the middle and lower Pecos River and Rio Grande—morphological descriptions, comparisons, Illustrations, and computer-interactive key. Final report of American Southwest Ichthyological Researchers to the U.S. Bureau of Reclamation, Albuquerque, New Mexico and Salt Lake City, Utah. (482 Mb)
Key to the Cyprinids (3.9 MB). Intkey data-set name = cyp-pr-r.
Upper Colorado River Basin
Snyder, D. E. and R. T. Muth. 2004. Catostomid fish larvae and early juveniles of the Upper Colorado River Basin—morphological descriptions, comparisons, and computer-interactive key. Colorado Division of Wildlife Technical Publication 42, Contribution 139 of the Larval Fish Laboratory, Colorado State University. (42 MB)
Snyder, D. E., S. C. Seal, J. A. Charles, and C. L. Bjork. 2016. Cyprinid fish larvae and early juveniles of the Upper Colorado River Basin—morphological descriptions, comparisons, and computer-interactive key. Colorado Parks and Wildlife Technical Publication 47. Contribution 197 of the Larval Fish Laboratory, Colorado State University. (38 MB)
Key to the Catostomids (696 KB). Intkey data set name = cat-ucrb
Key to the Cyprinids (840 KB). Intkey data set name = cyp-ucrb-r
North America (United States and Canada)
Key to the Families (490 KB). Intkey data set name = fam-na
Bibliography – Early Life History of Fishes
2002 update of: Hoyt, R. D. 1988. A bibliography of the early life history of fishes.; volume 1, list of titles. Dept. of Biology, Western Kentucky University, Bowling Green. (Updated by D. E. Snyder and T. Kennedy; MS word document, 4.8Mb.)
Original Site Layout
- cat-grb.zip (639 KB)
- cat-ucrb.zip (696 KB)
- cyp-grb-r.zip (686 KB)
- cyp-ucrb-r.zip (840 KB)
- fam-grb.zip (475 KB)
- fam-na.zip (490 KB)
INTKEY, the host program for these key data files, can be downloaded without cost from:http://delta-intkey.com, select “ Installing and running the programs.
ELHBIB20.zip (932 KB)
pkz204g.exe (198 KB)
Snyder_and_Muth_2004.pdf (* 42 MB)