7277

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

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C uronomids and rotifers volumetrically da nated in guts from
all treatments in week 2 (Fig. 7A-C), and cladocerans became important
in high and medium treatments in week 3. Cladocerans also occurred,
but in low volumes, in larval guts from low-treatment ponds. By the
fourth week, cladocerans and duronomids dominated in high treatments,
followed by rotifers, while in medium and low treatments, chinids,
cladocerans, and copepods were eaten. For the reminder of the
exper ment, chironcmids and cladocerans predc mated by volume in high
and medium treatments, while those two taxa, plus ostracods and
copepods, were eaten in low treatment ponds.
Numerically, animals clearly dadnated larval gut contents after
the first week of life (Fig. 7D-F). Rotifers were the most abundant
food in high and medium treatments, and rotifers, invertebrate eggs,
and chironomids shared equal represention in guts of larvae from, low-
treatment ponds. cladocerans became more numerous as food in high and
medium treatments in week 3, and dorm aids were clearly dominant in
the diet in low treatments. Tood habits diversified in week 4 in all
treatments, and remained diverse until weeks 6 and 7. Cladocerans
then became the major foods in high and medium treatments and
chircncamids, ostracods, and cladocerans shared numerical dominance in
diets in low-treatment ponds.
After the second week, guts of essentially all larvae appeared
full. The loglo of volume of foods in guts increased linearly with
size (Fig. 8A), and did not differ among treatments. However, log
numbers of organisms eaten remained more the same bout the size