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King Abdulaziz University (2012)

Reproductive Biology and Physiological studies of Rhabdosargus sarba (Family : Sparidae) in Jeddah

Alowaidi, Safaa Abduallah

Titre : Reproductive Biology and Physiological studies of Rhabdosargus sarba (Family : Sparidae) in Jeddah

دراسات بيولوجية وفسيولوجية التناسل في اسماك الصربه Rhabdosargus sarba عائله المرجانيات Sparidae في جده

Auteur : Alowaidi, Safaa Abduallah

Université de soutenance : King Abdulaziz University

Grade : Master Thesis 2012

The reproductive biology of Rhabdosargus sarba , locally called arid , from family sparidae has been studied in Jeddah water. A macroscopic and histological examination of the gonads demonstrated that R. sarba is typically a protandrous hermaphrodite. R. sarba spawns between December and March. Males and females attain sexual maturity at 17 cm in male and 23 cm in female stander length . Histological changes during the annual reproductive cycle and the stages of maturity of the ovary of Rhabdosargus sarba have been studied . The process of development is classified into four major phase : (i) primary growth phase ,during which germ cells (oogonia) proliferate through mitosis division giving rise to perinucleolar oocytes, (ii) secondary growth phase , characterized by the elaboration of yolk in the oocytes. ,(iii)oocyte maturation/ ovulation phase,when the eggs attain maximum size and are released from the follicle and (iv) oocyte atresia phase, when ripe eggs which do not ovulate undergo resorbtion . The results demonstrated that R.sarba has indeterminate fecundity. Absolute fecundity of R.sarba was found to increase from 146,340 to 550,536 with increasing length from 26.5 to 38.5 cm and from 146,340 to 704,304 with increasing weight from 299.5 g to 1099.5 g . The spermatogenesis is divided into four spermatogenic cells are recognized in the testis of R. sarba as follows : spermatogonia (primary & secondary) ; spermatocyte (primary & secondary) ; spermatid and spermatozoa. Active testes appeared more regularly during the peak of the reproductive season in January and February. In March, resting testes were observed indicating the end of the reproductive season. Transmission and scanning electron microscopy were used to investigate the ultrastructure of spermatozoa and ova in Rhabdosargus sarba. The ultrastrucutre of the spermatozoon of R. sarba has been determined. The spermatozoon is of the primitive type and lacks an acrosome. The bullet-shaped homogeneously electorn dense nucleus has a deep, fossa containing, proximal and distal centriols. Both centrioles are embedded in pericentriolar material which is intimately associated with the nuclear envelope. The anterior surface of two spherical mitochonchia lie within show depression of the nuclear caudal surface . The ultrastructure of the ova of R. sarba determined that the unfertilized egg is circular in shape and contain micropyle simple circular in shape and not flat. The ovarian follicular epithelium of R.sarba revealed that it consists of two layers, an outer theca layer and an inner granulosa layer with zona radiata under them . The zona radiate consists of 2 layers interna and externa zona radiate . The Zona radiate interna became thicker than zona radiate externa . The surface of zona radiate is wavey . Total lipid, fatty acids, total protein and amino acids content of three gonadal stages (nearly ripe , ripe and spawning) during the spawning season of both ovary and testis were discussed. Significant differences (P< 0.05) were recorded in concentration of fatty and amino acids content of ovary and testis.


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Page publiée le 22 novembre 2013, mise à jour le 4 décembre 2017