M. Bermudes et Aj. Ritar, Effects of temperature on the embryonic development of the striped trumpeter (Latris lineata Bloch and Schneider, 1801), AQUACULTURE, 176(3-4), 1999, pp. 245-255
Eggs collected from females of striped trumpeter (Latris lineata) that were
induced to ovulate with LHRHa were inseminated and incubated at six differ
ent temperatures ranging from 8.1 to 18.1 degrees C. Mortality was recorded
for four embryonic periods (I: cell cleavage, II: epiboly, III: organogene
sis and IV: organogenesis-growth). A power law was used to approximate the
relationship between temperature and developmental time to four stages of e
mbryonic development (visible peripheral periblast, yolk plug closure, hear
t beat and hatching). These models may have application for the ageing of s
triped trumpeter eggs. The time taken for 50% of embryos to hatch at 8.1, 1
0.5, 12.3, 14.1 and 16.2 degrees C was 13.0, 8.7, 6.4, 5.1 and 4.1 days, re
spectively. Embryos incubated at 18.1 degrees C developed abnormally and al
most all died during epiboly. Embryonic mortality was high during epiboly a
t 8.1, 16.2 and 18.1 degrees C and during organogenesis-growth at 8.1 degre
es C. Survival to hatch was highest at 10.5, 12.3 and 14.1 degrees C. The s
tandard length and body depth at vent at hatching decreased with increasing
temperatures but yolk volume was largest at 12.3 degrees C. The optimal te
mperature range for the incubation of striped trumpeter eggs was 10.5 to 12
.3 degrees C, which is close to the mean sea-surface temperature during the
spawning season (11.42-12.66 degrees C) and the ambient temperature experi
enced by the broodstock at spawning (11 degrees C). (C) 1999 Elsevier Scien
ce B.V. All rights reserved.