Morphological and
biochemical characteristics of phyllosoma after photothermal manipulation of
reproduction in broodstock of the spiny lobster, Jasus edwardsii
E.G. Smith, A.J. Ritar, C.G. Carter, G.A. Dunstan,
M.R. Brown-2003
Aquaculture, 220(1-4): 299-311
Abstract:
The consequences of photothermal manipulation of
reproduction in Jasus edwardsii broodstock on the morphology of newly
hatched larvae and their biochemical characteristics were examined. The
treatment of compressed temperature and photoperiod delayed the time of
moult, mating and egg extrusion, but reduced the period until larval hatch,
and reduced the hatching duration in individual females compared to the
ambient treatment of simulated natural photoperiod and water temperature.
Thus, the availability of phyllosoma for hatchery rearing was extended.
However, the broodstock in the compressed treatment produced smaller
phyllosoma and more larvae failed to develop beyond the naupliosoma stage
than animals from the ambient cycle. Phyllosoma from the compressed
treatment contained a higher proportion of polar and triacylglycerol lipid
classes, lower wax esters, elevated levels of the essential fatty acid
docosahexaenoic acid, a higher ratio of n-3/n-6 fatty acids, and lower
levels of ascorbic acid. The changes in larvae from the compressed treatment
may adversely affect their viability, and are probably due to the higher
water temperatures experienced during late embryonic development.