The effect of embryo
incubation temperature on indicators of larval viability in Stage I
phyllosoma of the spiny lobster, Jasus edwardsii
G.G. Smith, A.J. Ritar, P.A. Thompson, G.A. Dunstan,
M.R. Brown-2002
Aquaculture, 209(1-4) : 157-167
Abstract:
The effect of embryo incubation temperature on larval
viability, as measured by biological and biochemical parameters, on newly
hatched Jasus edwardsii phyllosoma larvae, was examined. Ovigerous
lobsters collected from the wild shortly after egg extrusion were held until
hatch in warm (18 °C), ambient (11.7 °C, range 9.5-13 °C) and cold (10.5
°C) water. The duration of embryonic development until hatch was directly
related to incubation temperature. The use of all three temperature regimes
(warm, ambient and cold) extended the period that phyllosoma hatched to 87
days compared to 30 days under the ambient regime alone. Embryonic
development in warm water produced Stage I phyllosoma that were
significantly smaller with reduced levels of eicosapentanoic acid (20:5n-3)
and sterols compared to the other treatments. Ascorbic acid reserves were
highest in cold incubated larvae. The results suggest a detrimental effect
of warm incubation temperature during embryonic development on Stage I
phyllosoma.