Published in Scientific Works. Series C. Veterinary Medicine, Vol. 19 ISSUE 3
Written by Ioan GROZA, Mihai CENARIU, Simona CIUPE, Al. Raul POP, Emoke PALL, Laura PARLAPAN, Lucica GERU
In order to check weather Danube river water provides adequate conditions for proper gametogenesis in pike, a full cycle of ovogenesis and spermatogenesis were followed. Pike capture was performed at the beginning of May, end of August, November and April for ovogenesis assessment, as well as in November and April for spermatogenesis study. For external macroscopic investigation fish were examined by inspection, while the internal aspects were studied by dissection. Histological sections of reproductive tract components were performed for microscopic evaluation. Research proved that the external examination of females can somewhat show the stage of the sexual cycle in pike, as their abdomen is slightly dilated in stage III, visibly dilated in stage IV and very dilated in stage V. Microscopically, the presence of two categories of oocytes during an ovogenic cycle proved that pike ovary is of grouped synchronous type, as the large oocytes mature and are eliminated during egg shedding, while the small ones remain for the next cycle. The spermatogenesis process was slow until stage III when it became rapid, spermatocytes being grouped, as zonal cell clusters. Both ovogenesis and spermatogenesis were normal under specific conditions provided by the Danube River.
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