出版社：Government of Western Australia / Department of Fisheries
摘要：Size at maturity in the western rock lobster (Panulirus cygnus) fishery in Australia increases from
north to south and female lobsters carry either one or two batches of eggs per season depending
on their carapace length. There has been a steady decrease in the size at first maturity of
western rock lobster over the last 30 years, and there are now significantly more small females,
many below the legal minimum size, contributing to the brood stock than any time since the
fishery has been researched. Biological data were used to show the current contribution to
egg production in different management regions of the fishery and historical length frequency
data were used to show how egg production has changed in those regions over time. Reasons
for the change in size at maturity in this fishery are unclear, but the outcome has been that egg
production is now more evenly distributed across management zones. Egg production was high
at the Abrolhos Islands in the 1990s owing to strong year classes of breeding animals entering
the fishery over those years. In the period since 2000, egg production has fallen sharply at the
islands, but has increased in the coastal population compared with the 1980s and 1990s.
关键词：Panulirus cygnus; egg production; size at maturity; Western Australia; efficiency
increase
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