7315

• UCREFRP Catalog Number: 7315
• Author: Colorado Water Conservation Board.
• Title: State of Colorado Hatchery Feasibility Study for Endangered Fishes of the Colorado River Basin, Vols. 1 & 2.
• USFW Year: 1993.
• USFW - Doc Type: \
• Copyright Material: NO

.

REFERENCE NUMBER:

014

CITATION:

Jensen. B.I... 1984. Annual narrative repon, calendar year 1984.
Dexter National Fish Hatchery, U.S. FISh and Wildlife Service.
Dexter, New Mexico.

SPECIES AND LIFE STAGE:

RZ, RZ_LARVAE, RZ_ADULT, CS, CS_LARVAE, CS_ADULT,
BT, BT_LARVAE. BT_ADULT

TOPICS:

Production. Disease

KEYWORDS:

COLORADO SQUA WFISH, RAZORBACK SUCKER,
BONYTAn.., FECUNDITY, SWIM-UP FRY, LERNAEA, ASIAN
TAPEWORM

SUMMARY: Razorback suckers, Colorado squawfish and bonytails were spawned at Dexter National Fish
Hatchery.

SPECIES n MEAN SWIM-UP FRY
FECUNDITY % of TOTAL
Razorback 2S 123,110 51.7
(Wild)
. Razorback 70 63,674 39.8
(Domestic)
ColOrado Sq. 9 66,185 19.8
(Domestic)
Bonytail 11 16,464 37.7

.

Lemaea problems remained in the bonytail, but razorback sucker and Colorado squawfish have
been cleared of this parasite. Asian Tapeworms were found in Colorado squawfish. Adult
squawtish were given ora! treatments of Di-N-Butyl- Tm-Oxide (DNBTO) in gelatin capsules
and three-year-old fish were given DNBTO on feed in an attempt to eliminate this parasite.
Extent of conuel was unknown at the time (December 6, 1984).

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