Some Biological Aspect and Gonads Histology of Sepia savignyi (Blainville, 1827), in the Gulf of Suez, Egypt

M. Amin, Amal; M. M. Elhalfawy, Alaa; M. M. Khouraiba, Hafz; A. M. Ali, Mervat

doi:10.21608/ejabf.2019.32325

Some Biological Aspect and Gonads Histology of Sepia savignyi (Blainville, 1827), in the Gulf of Suez, Egypt

Document Type : Original Article

Authors

10.21608/ejabf.2019.32325

Abstract

This work is the first histological description of gonad maturation of Sepia savignyi and the beginning of future research on its basic biology. A total of 452 samples, ranged in dorsal mantle length from 3.9 to 29 cm with average 16.35 + 1.50 and total weight ranged from 19 to 1826.8 gm, with average 606.79 + 110.7, of which 269, female and 183 male were examined between September 2014 to May 2015 obtained from the Gulf of Suez, Egypt. The size at first sexual maturity (DML₅₀) was 11.9 and 8.4 cm for female and male, respectively. The Gonadosomatic indices show that the females and males have two peaks in the year-round spawning period the first is in December (4.1 %) and (2.4%) and the second is in April (3.5%) and (2.2%) for female and male, respectively. Five stages of gonad maturation were established for the female and male, namely immature (I), maturing(II), mature (III), spawning (IV) and spent (V) based on macroscopic examination. Histological examination showed that each ovary and testis had various stages of oocyte and spermatocytes. Oogenesis of oocyte demonstrated seven stages of maturity in females as oogonia, early primary oocyte, late primary oocyte, previtellogenic oocyte, vitellogenic Oocyte, advanced vitellogenic oocyte and ripe oocytes. Spermatogenesis of testes divided into spermatogonia, primary and secondary spermatocytes, spermatid and spermatozoa.

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