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:: Volume 6, Issue 19 (Spring 2015) ::
JPG 2015, 6(19): 53-58 Back to browse issues page
Gonad Histology and Gonadosomatic Index Variations during Gonadal Development of Wild Female Tenualosa ilisha
Zohre Moallem , Rahim Abdi , Abdolali Movahedinia , Solmaz Shirali , Amir Parviz Salati
Khorramshahr University of Marine Science and Technology
Abstract:   (2601 Views)

Hilsa shad (Tenualosa ilisha) is an anadromous species which has reproductive migration from the Persian
Gulf to the river. Morphological properties and histological changes in oocyte of Hilsa shad in two different
environments (salt water and fresh water in Khuzestan province) were studied with respect to its reproductive
cycle. Twenty fish samples with average weight of 830.75±3.25 gr, were collected from Bahmanshir
(freshwater) and Musa creek (estuarine water). Following biometry (length and weight measurements), pieces
of ovary of each fish were fixed in Bouin's fixative solution. Microscopic sections (5μm thickness) from
paraffin embedded tissues were prepared and stained with Hematoxylin & Eosin, and then slides were studied
under light microscopy. Results showed six phases as follows: chromatin nucleolus, perinucleolus, cortical
alveolus, primary vitellogenesis, secondary vitellogenesis and third vitellogenesis were recognized in ovaries
of T. ilisha. Three follicular layers such as theca, granulosa and zona radiata were clearly observed at the end
of the vitellogenesis. The most oocyte diameters were also measured at the same phase. Ovarian follicles were
at the same phase as in the ripe ovaries, indicating Hilsa shad is synchronous fish species in ovarian
development. The changes observed in the pattern of oocyte development in T. ilisha was typical of the
patterns described in most synchronous spawners studied to date.

Keywords: Tenualosa ilisha, Ovary, Oogenesis, Anadromous
Full-Text [PDF 463 kb]   (597 Downloads)    
Type of Study: Basic and Original Research | Subject: Marine Biology
Received: 2016/02/2 | Accepted: 2016/02/2 | Published: 2016/02/2
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Moallem Z, Abdi R, Movahedinia A, Shirali S, Salati A P. Gonad Histology and Gonadosomatic Index Variations during Gonadal Development of Wild Female Tenualosa ilisha. JPG. 2015; 6 (19) :53-58
URL: http://jpg.inio.ac.ir/article-1-360-en.html


Volume 6, Issue 19 (Spring 2015) Back to browse issues page
نشریه علمی پژوهشی خلیج فارس Journal of the Persian Gulf
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