Guides and Keys to Larval and Early Juvenile Fishes
The following files are early life stage identification guides and keys to the catostomid and cyprinid fishes of the Upper Colorado and Gila river basins and to the families of fishes in the Gila River Basin; also, a draft early life stage key to the families of fishes in U.S. and Canadian fresh waters. The key data files require and are accessed by the host computer-interactive software program DELTA-INTKEY, which must first be installed on your computer (instructions follow) or run from a CD or online source. Once up and running and if so desired, the keys can be limited to consider only user selected taxa or taxa in predefined regions or basins (e.g., in the Upper Colorado River Basin key, only species in the Yampa River 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 and install the INTKEY software without cost from the DELTA-Intkey website. Default location for software installation is C:/Delta. The “exe” distribution file is self-extracting with installation instructions. An optional test version update of the Intkey program is also available and recommended (click on “test versions,” download ”intkey.zip,” then expand that file in your DELTA folder to overwrite the originally installed program and two associated files).
- Download one or more of the larval fish keys below. These are compressed files; save and decompress them in the default folder C:/Delta/doc or other desired folder.
- Start INTKEY software and “Select data set” by browsing the directory where the data sets are stored and open the preferred interactive key. The name of each data set as used by INTKEY is shown below in itallics.
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. 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
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; importable text file compressed as ELHBIB20.ZIP; 932 KB.)
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 “Programs and Documentation,” then “Intkey”.
ELHBIB20.zip (932 KB)
pkz204g.exe (198 KB)
Snyder_and_Muth_2004.pdf (* 42 MB)