Influence of 17β-oestradiol (E2) and 17α-hydroxyprogesterone (OHP) on ovarian maturation in Penaeus semisulcatus De Haan, 1844 (Decapoda, Dendrobranchiata, Penaeidae) from the Mediterranean Sea off Alexandria, Egypt

What is it about?

This study aims to investigate the influence of 17β-estradiol (E2) and 17α-hydroxyprogesterone (OHP) on ovarian maturation in Penaeus semisulcatus (De Haan, 1844). _x000D_ We found that females present a single spawning in each reproductive cycle. The morphological characteristics of the oocytes and the correlation between the gonadosomatic and hepatosomatic indices indicate the presence of endogenous and exogenous vitellogenesis. The cells that make up the hepatopancreatic tubule are of morphological characteristics related to the functions of digestion and assimilation of nutrients, as well as the basic energy reserve for the reproductive processes. The reproductive process is regulated by steroid hormones and requires high concentrations of 17β- E2 and OHP at the beginning of the ovarian maturation, and the need for low concentrations of these hormones to trigger the spawning. Ecdysone concentration did not fluctuate in ripe females. Its level increases from stages I-IV of vitellogenesis._x000D_

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