7785

• UCREFRP Catalog Number: 7785
• Author: Thompson, J. M.
• Title: The Role of Size, Condition, and Lipid Content in the Overwinter Survival of Age-0 Colorado Squawfish.
• USFW Year: 1989.
• USFW - Doc Type: Colorado State University,
• Copyright Material: NO

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11

Fish were subjected to three different feeding regimes.
Fish of each size class in three aquaria (9 aquaria total)
were fed dry pelleted trout food twice weekly at 2% of the
total biomass of fish present in the aquarium. Fish of each
size class in two aquaria (6 aquaria total) were not fed.
Fish in three additional aquaria (one per size class) were
fed live, newly hatched brine shrimp (Artemia sp.) ad
libitum daily.
On days 70 and 140 of the experimental period,
one-fourth of the surviving fish in. each aquarium were
removed, measured for total length and wet weight, and
frozen for later lipid analysis. On day 210, all remaining
fish were measured, weighed, and analyzed for lipids.
Throughout the 210-day experiment, both dead and dying fish
(those exhibiting loss of equilibrium or uncoordinated
swimming movements~ were removed daily, measured for length
and weight, and analyzed for lipid content. All fish
lengths were total lengths measured to the nearest
millimeter. Fish were patted dry on a paper towel and then
weighed to the nearest 0.01 g. Condition factor (K) was

calculated by the formula (Weatherley and Gill 1987) :
W x 105
K =
L3
where W is weight in g, and L is length in mm.