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Pinealectomy and ovarian development in the grey mullet, Liza ramada
Author(s) -
Sagi G.,
Abraham M.,
Hilge V.
Publication year - 1983
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1983.tb02913.x
Subject(s) - pinealectomy , biology , photoperiodism , gonadosomatic index , oocyte , ovary , reproduction , medicine , endocrinology , pineal gland , anatomy , andrology , melatonin , fishery , botany , embryo , ecology , population , environmental health , fecundity
Adult female specimens of Liza ramada were pinealectomized and sham‐pinealectomized, and the development of their ovaries was followed over a period of 14 weeks and compared with those of untreated controls. Pinealectomized specimens exposed to long photoperiod (16L/8D) for 14 weeks, showed undeveloped ovaries, with a maximum oocyte diameter of less than 100 μm, and a gonadosomatic index of 0·6 similar to that of sham‐pinealectomized and control specimens. In pinealectomized females exposed to short photoperiod (8L/16D) for 6 weeks, the mean diameter of oocytes was 270 μm v . 155 μm in control and sham‐pinealectomized specimens. After 9 weeks, the oocytes in pinealectomized specimens reached 430 μm as against 265 μm in the controls. Within 14 weeks of pinealectomy, mean oocyte diameter was 480 um while it was 400 μm in controls and sham‐pinealectomized specimens. It is tentatively concluded that the pineal complex has an inhibitory effect on ovarian function in Liza ramada exposed to short photoperiod.