Ciclo reproductivo y fecundidad del lenguado Paralichthys patagonicus Jordan, Jordan y Goss 1889
Diaz de Astarloa, J.M.
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The reproductive characteristics of the flounder (Paralichthys patagonicus)are analyzed on the basis of the microscopic and macroscopic study of the ovaries. Preliminary estimations of the fecundity of this species are also made. The samples were obtained from the monthly commercial langings in Mar del Plata and from research cruises undertaken by the INIDEP. A total of 641 ovaries were studied; 210 of which were selected for the histological analysis. 24 ovaries with hydrated oocytes and without post-ovulatory follicles were used to determine batch fecundity. A macroscopic maturity scale of five stages was established. The histological analysis allowed to introduce three substage within the maturation stage including a partial spawning stage. According to the results obtained, Paralichthys patagonicus is a multip-le spawner with low batch fecundity and variable reproductive frecuency. The number of hydrated oocytes was 20,000 to 160,000 in the ovaries of afemales of 42 - 53 cm total length range. The relationship among batch fecundity, total length and gonad weight variables, showed a better adjustment to the lineal model. The flounder spawns between September and February with maximum reproductive activity in November.