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Quantitative genetic analysis of growth and survival in Penaeus vannamei versus temperature
xiii, 103 leaves : illustrations ; 28 cm.
0.08 to 0.57, respectively. The highest estimates were
32 'C. Experiment 2 involved 4,624 progeny within 34 full-
a selection intensity of I % in both males and females ranged
As temperature increased, growth increased but survival
at 20 and 23 'C, and between weight gain and survival at all
correlations were observed between final weight and survival
decreased. The random effect of family within dam and sire
Disadvantageous genetic correlations were found between
effect were significant for growth and survival. The
final weight, 0.08 to 0.44 for weight gain, and from -0. 19
from 1.02 to 3.97 g for final weight, 0.50 to 2.96 g for
full-sib and 24 half-sib fan-milies, cultured at 20, 23, and
growth and survival at 20 'C. Unfavorable phenotypic
growth in both experiments. However, for survival, the
interaction was only significant in the second experiment.
interactions of genotype by environment were significant for
juveniles of the marine shrimp Penaeus vannamei versus
obtained under conditions of high temperature.
performance in P. vannamei appears to be very good.
populations of origin, and the fixed environmental treatment
quantitative genetic aspects of growth and survival in
respectively. Heterosis values for the various crosses among
sib and 16 half-sib families, cultured at 20, 23, and 33 'C.
survival, h 2 ranged from 0.22 to 0.73, 0.14 to 0.69, and
temperature. Experiment I involved 4,486 progeny within 27
temperatures. I Estimated genetic gains per generation with
the opportunity for genetic improvement of aquacultural
These interactions accounted for only 0.16 to 0.26 % and 1.63
three shrimp populations, as a fraction of the mean for the
to 0.23 for survival. Heritability (h 2 ) estimates varied
to 2.03 % of the total variance in growth and survival,
Two 8-week laboratory experiments were conducted to evaluate
two pure parent populations, ranged from 0. 10 to 0.40 for
weight gain, and from 5.33 to 79.15 % for survival. Thus,
with temperature. For final weight, weight gain and
"Major subject: Wildlife & Fisheries Sciences".
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Includes bibliographical references: pages 88-98.