alexa Role of ecdysteroids and methyl farnesoate inmorphogenesis and terminal moult in polymorphicmales of the spider crab Libinia emarginata
Geology & Earth Science

Geology & Earth Science

Journal of Oceanography and Marine Research

Author(s): Guiomar Rotllant, Peter Takac, Lei Liu, Hans Laufer

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Here we examine morphogenesis and terminal anecdysis in male morphotypes of the spiderŽ. Ž.crab Libinia emarginata through eyestalk removal ablation . Methyl farnesoate MF , anŽ.unepoxidated form of juvenile hormone JH III and hydroxyecdysone, a moulting hormone, weremeasured in attempt to understand these processes and to determine the physiological character-istics of each morphotype, to be able to induce maturation by hormonal treatment and improvecrustacean culture. Following arrival at the laboratory, ablated small-claw unabraded small-cara-Ž.pace males SUM moulted within 30 days to a juvenile and control SUM moulted within 75 daysto a mature morphotype with large claws. Following eyestalk removal small-carapace abradedŽ. Ž.males SAM , large-carapace unabraded large-claw LUL and large-carapace abraded large-clawŽ.LAL males never moulted even after 60 days, while the other ablated morphs moulted in 25–35days. Significant increase of MF levels was observed in SUM, SAM and LUL de-stalked animalscompared to intact control group, while no differences were observed in LAL individuals. In fact,LAL crabs presented the highest level of MF up to 2.23 ngrml. Ten days prior to moulting MFincreased 4-fold, and the ecdysteroids increased 15-fold in the haemolymph of ablated SUM and25% in their testes. Ecdysteroid levels in the haemolymph of the SAM, LUL and LAL

This article was published in Aquaculture and referenced in Journal of Oceanography and Marine Research

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