FN Archimer Export Format PT J TI Cycles sexuels de quelques poissons plats des cotes bretonnes. OT Sexual cycles of some flat fishes of the Brittany coasts. BT AF LAHAYE, Jacqueline AS 1:; FF 1:; TC 0 UR https://archimer.ifremer.fr/doc/1972/publication-2064.pdf LA French DT Article DE ;Gonadosomatic activity;Sperm;Species;Brittany coasts;Flat fishes;Sexual cycles AB Representative species of the families Pleuronectidae, Bothidae and Soleidae were studied throughout the year. Changes are described which were seen in the ovaries, and photographs of cross sections of the tissue are shown. The progress of egg release was noted, and in some cases correlated studies were made of gonadal changes in male. The period of egg release was prolonged over 1 one half -2 months for plaice and turbot, and for 6 months for sole. Individual fish showed these extended periods of laying, and the actual months of the year differed for each species. The massive mobilisation of reserves which necessarily accompanied the release of large numbers of eggs was reflected by turbot, in sperm production. In addition, the increase in gonadosomatic activity was preceded by an increased hepatosomatic activity. These fluctuations were not evident in sole. It is suggested that the sole would be less suited to an experimental breeding system than would be turbot or plaice. PY 1972 PD JUL SO Revue des Travaux de l'Institut des PĂȘches Maritimes SN 0035-2276 PU ISTPM VL 36 IS 2 BP 191 EP 207 ID 2064 ER EF