Effect of water acidification on the oogenesis of tilapia Oreochromis mossambicus
https://doi.org/10.36038/2307-3497-2022-188-59-66
Abstract
The idea and methodology of work are based on the results of experiments carried out earlier. Purpose of work by exposing fish to a sublethal acidic effect before and after the formation of the generation of previtellogenic oocytes in them, to influence the number of the fund of germ cells and to follow the long-term consequences of this effect up to puberty.
The material of the study was the juvenile Oreochromis mossambicus, which was obtained from one female, and randomly divided into control and two experimental variants, had a sublethal acid effect on the fish in the experiments — pH 3.78–3.85 at the age of 22–45 and 22–60 days from fertilization.
Methods used: Experimental study of ovarian development in female tilapia. In the study of the gonads, their histophysiological study was performed with a quantitative analysis of the fund of germ cells of all conditions.
Results. In the experimental fish, the recovery of the growth rate during the period and its acceleration after the end of the acid treatment were observed. Against the background of the restoration of the growth rate by the end of the acid exposure, tilapia females experienced an increase in the fund of oocytes during the previtellogenesis period. The increased older generation of oocytes was preserved in experimental fish until puberty, which led to a significant increase in their absolute fecundity, while maintaining the diameter and mass of oocytes. The work has a pronounced fundamental orientation.
Its practical and theoretical significance lies in understanding the patterns of formation of the fund of germ cells at an early age, as the basis for determining the magnitude of fecundity in ontogenesis.
About the Author
O. V. Zelennikov
St. Petersburg State University («PSbSU»)
Russian Federation
Russian Federation
Oleg V. Zelennikov
199034
University emb., 7/9
St. Petersburg
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Review
For citations:
Zelennikov O.V. Effect of water acidification on the oogenesis of tilapia Oreochromis mossambicus. Trudy VNIRO. 2022;188:59-66. (In Russ.) https://doi.org/10.36038/2307-3497-2022-188-59-66
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