Publication Date:
2021-05-19
Description:
The grey mullet (Mugil cephalus) is one of the most common fish species in the Mediterranean Sea. Morphological and histological studies on testes of this species indicate six successive maturity stages. The specific changes in serum sex hormone levels were found to occur during the different phases of gonadal development. Concentration of serum steroid hormone in male Mugil cephalus revealed a marked drop in serum steroid (estradiol and testosterone) hormone levels in nearly ripe stage when compared with ripe stage, while the concentration of estradiol, testosterone and progesterone at late stage (ripe stage) of sexual maturity was increased. Histological examination and cyclic change in the testes were revealed of active spermatogenesis with all generations in the early stages of testicular development. Nearly ripe testes showed more active spermatogenesis, nests of spermatocytes and small number of spermatids. While at ripe stage, the seminiferous lobules contained a fair quantity of spermatozoa with little spermatids. Ultra-structural examination showed well differentiated interlobular connective tissues which noticed at early stages. In nearly ripe stage, the fine structure revealed that early spermatids have round shaped vacuolized cells, a spherical nucleus with diffuse chromatin and without mitochondria. At this stage the interlobular connective tissue were hypertrophied, increase in thickness and filled with abnormal fibers. The abnormal shape of interlobular tissue was observed. Ultra-structurally, all the spermatozoa cells were deformed in shape, characterized by small ovoid or spherical nucleus with highly compact chromatin, surrounded by thick tissue appeared with two deformed mitochondria. In the present result, the concentration of steroid hormone in Mugil cephalus in Lake Quaron was highly correlated with the dysfunction of gonadal hormone, maturation of gametes and considered as good sign of infertility and shortage in secretion function of these tissues may be due to unsuitable environmental condition in Lake Quaron needed for spawning of male.
Description:
National Institute of Oceanography and Fisheries (NIOF), Egypt
Description:
The Egyptian Journal of Aquatic Research is abstracted in both of Zoological Record and Chemical Abstract since Volume 31(1), 2005.
The Chief Editor: Prof. Fatma Aly Abd El-Razek
E-mail: fatma_abdelrazek@hotmail.com
Description:
Published
Description:
Steroid hormone, Steroidogenic secreting tissue
Keywords:
Field Study
;
Ultrastructure
;
Ultrastructure
;
Mullet fisheries
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Non-Refereed
,
Article
