Spermatogenesis of the pumpkinseed Lepomis gibbosus (Linnaeus, 1758) in the conditions of the Samara Bay of Zaporizhzhya Reservoir
Journal Title: Екологічні науки - Year 2018, Vol 23, Issue
Abstract
The process of spermatogenesis of the pumpkinseed in Ukrainian reservoirs has not been studied yet. The study of spermatogenesis has a great theoretical and practical significance. We conducted a study on spermatogenesis of the pumpkinseed in the conditions of the Samara Bay of Zaporizhzhya Reservoir. During the period from June 20 to June 26, 2018, the gonads of all experimental males were in the IV stage of maturity, and the gonado-somatic index (GSI) varied in the range from 0.23 to 1.21% (on average of 0.73±0.39%). On the preparations of seminal fluid smears, the sexual cells of three phases of development were observed: spermatocytes of the first order (12.1%), spermatocytes of the second order (41.0%) and spermatids (46.9%). Thus, during spawning in males of the pumpkinseed, in the first portion of the seminal fluid, up to 50% of the spermatoidis formed, which forms the first generation of spermatozoa. According to the results of cytometric analysis of reproductive cells of the pumpkinseed, it was found that spermatocytes of the first order had a size of 13.68±2.21 μm2 . Spermatocytes of the second order were 39.1% smaller, and their sizes were 8.32±1.19 μm2 . The smallest cells were spermatids and reached 3.47±0.56 μm2 . During the course of spermatogenesis, the nucleus of spermatocytes decreases with the beginningof the next phase of the development of sexual cells. Thus, in spermatocytes of the first order, the nucleus had a size of 0.61±0.13 μm2 , and in the spermatocytes of the second order the nucleus were three times smaller and reached 0.21±0.08 μm2 .
Authors and Affiliations
О. С. Нестеренко, О. М Маренков
Keywords
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