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Gonad morphology of the hermaphroditic fish diplectrum pacificum serranidae

, : Gonad morphology of the hermaphroditic fish diplectrum pacificum serranidae. Copeia (3): 448-453

Histological and gross examinations were conducted on the gonads of D. pacificum collected from the Bay of Panama. There is a single gonad wihch bifurcates into 2 ovarian lobes anteriorly. Posterior to the point of bifurcation, the ovarian lobes combine to run medial to a broad ring of testicular tissue. Sperm enter into a dorsal sperm sinus, then enter a sperm duct. The sperm duct becomes closely aligned with the mesonephric duct to which it joins just prior to exit through an elongate papilla. Mature eggs enter a posterior ovarian sinus. The ovarian sinus bears numerous elongate ovarian folds which are villae-like and show a positive PAS [periodic acid Schiff] reaction when many mature eggs are present in the sinus. A putative endocrine tissue is described which is similar to previously described suspected endocrine tissues from related species. The ovarian villae-like structures are apparently unique to Diplectrum and this and other differences in gonad morphology are noted between Diplectrum and Serranus. These differences may be important in understanding the relationship between these genera.


DOI: 10.2307/1443262

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