Investigations of protogynous sex change in the Bluebanded Goby (Lythrypnus dally) in the field using artificial underwater habitats.

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Investigations of protogynous sex change in the Bluebanded Goby (Lythrypnus dally) in the field using artificial underwater habitats.

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Title: Investigations of protogynous sex change in the Bluebanded Goby (Lythrypnus dally) in the field using artificial underwater habitats.
Author: Moore, B
Abstract: The majority of experiments investigating sex change in fish have been performed in laboratory environments. Currently, Lythrypnus dalli, the bluebanded goby, is being established as a model species for analyzing the dynamics of socially controlled sex change. The majority of its study has also been performed in the laboratory. The goal of our study was to elicit sex change of L. dalli in a more natural environment and compare field dynamics with a model derived from laboratory-based analysis. Groups of L. dalli, composed of one large male and three females of various sizes, were introduced into artificial cement habitats. Located in Big Fisherman's Cove, Catalina Island, the habitats were in 30' of seawater, open to the ocean and fully exposed to the environment. After five days of acclimation, the male was removed. Following removal, the majority of the dominant, largest females underwent protogynous sex change. Within fifteen days, eight out of fifteen initially dominant female fish successfully fertilized eggs as males. Sex-changing fish displayed the distinctive temporal sequence of behavior changes consisting of a dominance, a quiescent and a courting phase, as previously documented in laboratory experiments. Histological analysis of sex-changing fish revealed gonads, genital papillae, and accessory gonadal structures with morphology that were transitional to that of representative females and males.
Description: American Academy of Underwater Sciences (http://www.aaus.org/)
URI: http://archive.rubicon-foundation.org/8979
Date: 2000

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