Gonad development and evidence of protogyny in the red-throat emperor on the Great Barrier Reef

Bean, K., Mapstone, B.D., Davies, C.R., Murchie, C.D., and Williams, A.J. (2003) Gonad development and evidence of protogyny in the red-throat emperor on the Great Barrier Reef. Journal of Fish Biology, 62 (2). pp. 299-310.

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Abstract

The gonad development in the red-throat emperor Lethrinus miniatus is described and the first detailed evidence for protogyny in this species provided. The identification of transitional individuals, bimodal sex-specific size-frequency distributions and female biased sex ratios suggest that L. miniatus is most likely a protogynous hermaphrodite. Transitional L. miniatus gonadswere characterized by the concurrent degeneration of all oocytes and the proliferation of spermatocysts near the edge of the lamellae, an increase in blood vessels along strands of stromal tissuewithin the lamellae and the formation of multiple sperm sinuses.The sites of oocyte degeneration and proliferationof spermatocysts were spatially segregated. An increase in blood vessels along strands of stromal tissue within the lamellae of transitional phase gonads is likely to assist in the breakdown of oocytes and the proliferation of spermatocysts. Mostmature resting females containing spermatocysts occurred within the transitional size-frequency distribution, suggesting that the presence of spermatocysts in these femalesmay be an early sign of sex change. Oocyteswithin female gonads were interrupted by filamentous strands of stromal tissue within the lamellae. The testis contained a remanent ovarian lumen but no residual oocytes. Three characteristics of transitional L.miniatus gonads were found to be unusual and described for few other species of coral reef fishes. These included the absence ofoocyteswithin testes, increased numbers of blood vessels, and the presence of strands of stromal tissuewithin the lamellae.

Item ID: 433
Item Type: Article (Refereed Research - C1)
Keywords: Fish reproduction, Gonad development, Lethrinus miniatus, Protogyny, Stromal tissue
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Copyright 2003 Blackwell Publishing : This journal is available online (use hypertext link above)

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ISSN: 1095-8649
Date Deposited: 22 Sep 2006
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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