出版社：Government of Western Australia / Department of Fisheries
摘要：The size of the western rock lobster broodstock is variable over the range of the Western
Australian fishery, due to regional differences in the density and length structure of the stock
and the female’s size at maturity. Management regulations do not currently discriminate in the
protection afforded to the broodstock in the different regions. This study has examined whether
regional and size differences in early egg diameter, phyllosoma length at hatch and phyllosoma
competency, are related to lipid class and fatty acid composition, protein composition and
water content in late stage eggs and early stage phyllosoma larvae. A positive relationship,
particularly to phyllosoma competency, would have management implications for the protection
of broodstock in different parts of the fishery. Females were sampled in three size groups
captured in two sampling regions (Abrolhos Islands 60¨C70 and 80¨C90 mm CL; coastal 80¨C90
and >95 mm CL). Mostly, eggs and larvae from different maternal size classes and regions
were not significantly different with respect to lipid class and fatty acid composition, protein
composition and water content, and larval competency. The lipid classes of eggs differed
significantly (p < 0.02) between the three maternal size-classes; fatty acids differed significantly
between both eggs and phyllosoma grouped by maternal catch site and size-class (p = 0.02 and
0.003, respectively); and there was no correlation between biochemical differences and larval
competency. These results imply that maternal identity and subsequent diet may have a greater
influence on larval competency in P. cygnus than the maternal attributes (size and capture site)
that were tested.
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