Reproduction in the dusky grouper from the southern Mediterranean
作者： G. Marino , E. Azzurro , A. Massari , M. G. Finoia , A. Mandich
DOI: 10.1111/J.1095-8649.2001.TB00544.X
关键词: Sex ratio 、 Zoology 、 Sexual maturity 、 Sperm competition 、 Epinephelus marginatus 、 Ecology 、 Development of the gonads 、 Biology 、 Gonad 、 Serranidae 、 Hermaphrodite 、 Aquatic science 、 Ecology, Evolution, Behavior and Systematics
摘要: Demographic data and gonad histology confirmed that the dusky grouper Epinephelus marginatus is a protogynous hermaphrodite follows monandric pathway to sexual development. Females reached first maturity at 36.7 cm L S estimated mean length (L 50 ) was 43.8 for females 81.3 males. Adult sex ratios during reproductive period were c. 3.5: 1 exhibited group-synchronous ovarian development multiple ovulation occurred over spawning period. Gonads ripe from early May June until September. The size of testes (0.6% W) indicated strong oligospermy suggested mating system with no sperm competition. Sexual transition involving regression tissue proliferation testicular in gonads. Transitional individuals through November accounted 9% sampled adult population. Sex change fish 69-93 long distributions males overlapped 27% range Special zones recognized as gathering areas sexually mature groupers
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