7277

• UCREFRP Catalog Number: 7277
• Author: Papoulias, D.
• Title: Survival and Growth of Larval Razorback Sucker,
• USFW Year: 1988.
• Copyright Material: NO

11cperiments were performed indoors at Dexter National Fish
Hatchery (NM, Dexter, New Mexico. One gallon (3.9 L) glass jars
were arranged in rows in raceways. Jars were placed in series (not
randomly), with position effects controlled by a constant-twperature
water bath and providing uniform lighting. Continuous water flow at
approxfmately 100 ml min 7l and constant volume were provided by 2.54-
cm pipes perforated above each jar. Jars were tilted to facilitate
outf o 1t and screened to Prevent escape of larval fish and live food.
Adult, wild-caught (Lake Mohave) female razorback suckers
received three injections of 220 N chorionic gonadotrcpin kg-l body
weight at 24-h intervals for 3 d begi tini ng 11 February 1985 (Ham¢nan
1985). Twenty--four h after the third injection, eggs could be
expelled with slight pressure. Gametes were then stripped, and
fertilized by milt from naturally-ripened, Jake Mohave males.
Fertilized eggs were incubated at 2100 in Heat trays (Inslee 1982).
Hatching began on 18 February, and larvae began to swim actively on 23
February 1985. On 25 February, 9.4- to 10.7-mm TL (x = 9.96±0.04,
W50) larvae were stocked at 10 individuals jar 1. Mcperiments were
continued for 50 d, Until 16 April 1985, at a constant temperature of
18oC.
Larval fish randcamly selected for feeding trials received newly-
hatched, live brine shrimp (Artemia saliva) nauplii. San Francisco
BaYS brand eggs were incubated in aerated 3.9-L jars at 27-280C for 36
8