Amira Salah El-Din Hefny¹ , Osama Ahmad Abass² , Magdy M. El-Halafway¹ , Mohamed Wafeek³ , Mohamed A. Abu El-Regal⁴

1 Fish Reproduction and Breeding Lab., Aquaculture Division, National Institute of Oceanography and Fisheries, Suez, Egypt
2 Zoology Department, Faculty of Science, Port Said University, Port Said, Egypt
3 Department of Reproductive Physiology, Central Laboratory for Aquaculture Research, Agriculture Research Center, Egypt
4 Marine Science Department, Faculty of Science, Port Said University, Port Said, Egypt
Author    Correspondence author
International Journal of Aquaculture, 2016, Vol. 6, No. 6   doi: 10.5376/ija.2016.06.0006
Received: 22 Mar., 2016    Accepted: 20 May, 2016    Published: 15 Nov., 2016

This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Hefny A.S.E.D., Elhalfawy M.M., Abass O.A., Wafeek M., and El-Regal M.A.A., 2016, Ovarian development and sex steriod hormones in the keeled fish liza carinata (valenciennes, 1836) from Suez Bay, Egypt, International Journal of Aquaculture, 6(6): 1-10 (doi: 10.5376/ija.2016.06.0006)

This work aims to investigate the microscopic structures of ovaries of Liza carinata collected from Suez Bay during annual cycle combined with the relation between GSI (gonadosomatic index) and sex steroid hormones concentration for female during the study period. The oocyte maturation showed the following phases; first growth phase which includes chromatin-nucleolus stage, early and late perinucleolus stages. Second growth phase includes vacuolization stage (yolk vesicle stage), yolk stages (primary, secondary and tertiary), and ripe stage. The maturity stages of ovary recorded and classified into seven stages (Immature, Immature & Recovering, Developing, Maturing, Mature, Spawning and Spent). The cyclic changes in GSI indices are considered as further a proof that the spawning season is extending from November (8.88%) to March with value (0.62%). Sex steroids hormones play a role in controlling the maturation cycle in teleost especially during spawning times, which altered by environmental or hormonal manipulation. 17β - Estradiol levels in female L. carinata ranged from maximum value 0.199 ± 0.087 ng/ml recorded in maturing stage to 0.102 ± 0.016 ng/ml ml in December 2012. The lowest value of testosterone was observed in February with value (17.4 ± 1.054) in spawning and spent stages of maturity.

Liza carinata; Oocyte maturation; Oogenesis; Gonadosomatic index; Sex hormones; Suez Bay