9528 ‎(2)‎

• UCREFRP Catalog Number: 9528
• Author: Martinez, P. and N. P. Nibbelink.
• Title: Colorado Nonnative Fish Stocking Regulation Evaluation.
• USFW Year: 2004.
• USFW - Doc Type: Grand Junction, Laramie.
• Copyright Material: NO

1
t Vendor sales receipts
' Due to data inadequacies within CDOW far documenting private-sector stocking activity,
particularly for the pre-regulation period, written and verbal requests were made to vendors
asking for voluntary submission of their stocking records or copies of sales receipts for the years
1998-2000. Data submitted via this request constituted the bulk of the data available for the pre-
regulationperiod for the years 1998-1999. Records that could be cross-validated with
importation records were removed to avoid duplication. Those with specific location
information that were not identified in the importation database were added to the fmal
"StockingAll" GIS layer.
CDOW private stocking permits
Data on private landowner fish stocking permits for the year 2000 'were derived from the
CDOW's Fish Health Section files (Linda Chittum, former CDOW Fish Pathologist). These data
for 2001 were obtained from Lori Martin (CDOW Nonnative Fish Control Biologist). These
data had been compiled into a database designed by Lori Martin, greatly facilitating their utility.
It was assumed for the purposes of mapping and analyses herein that permitted stocking was
actually carried out. An important caveat, however, is that this dataset is considered incomplete.
Non-permitted or non-reported stocking would add to this data set, but the extent of compliance
with permitting requirements was and remains unknown, but is expected to be substantive.
CDOW importation permits
t The DOW fish importation database (K. Konishi, CDOW Special License Administrator)
provided another potential source for information on fish stocking for the years 1997-1999.
Importation records were sometimes useful in locating individual stocking events, but often
simply indicated "statewide" as the destination for the fish.
CDOWprivate and commercial lake licenses
The CDOW lake license database (K. Konishi, CDOW) provided additional commercial
and private records from 1997-2001, although indirectly, of potential stocking activity in
standing waters of Colorado. The lake license information was subject to the same difficulty in
mapping the spatial location of a lake if specific information was not provided.
CDOW stocking records for public waters
' We summarized nonnative, nonsahnonid fish stocking performed by CDOW for the years
1997-2001 relative to the receiving water's position on the landscape. The total number of
nonnative species stocked relative to both the 6,500-foot elevation contour and to the flood
plains were summarized. Unlike the private stocking, the spatial locations of these data were
accurate to the center of the water that was stocked, so the flood plain designations are accurate.
Normative fish stocking events for select species of particular concern to the Recovery
Program were mapped (triploid grass carp, channel catfish, bluegill, black crappie, largemouth