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1

Cyclic development of sex cells in artificially bred rudd Scardinius erythrophthalmus [L.]

100%
Kopiejewska W., Terlecki J., Chybowski L.
Acta Scientiarum Polonorum. Piscaria
|
2004
|
tom 03
|
nr 1-2
2

Course of spermatogenesis in Herpobdella octooculata L. in natural environment and after administration of cadmium

100%
Holdakowska-Deja T.
Acta Biologica Cracoviensia. Series Botanica et Zoologia. Supplement
|
1997
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tom 39
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nr 1
3

The effect of sperm concentration in the ejaculate on morphological traits of bull spermatozoa

67%
Kondracki S., Banaszewska D., Wysokinska A., Iwanina M.
Folia Biologica
|
2012
|
tom 60
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nr 1-2
4

Varied somatic growth and sex cell development in reciprocal hybrids of roach Rutilus rutilus [L.] and ide Leuciscus idus [L.]

67%
Kopiejewska W., Terlecki J., Chybowski L.
Archives of Polish Fisheries
|
2003
|
tom 11
|
nr 1
Body length and weight and the developmental stage of sex cells were determined in 1.5- and 3-year-old specimens of the F₁ generation of reciprocal hybrids of roach Rutilus rutilus and ide Leuciscus idus. Body length and weight and the developmental stage of sex cell varied in reciprocal hybrids of roach and ide. The hybrids obtained from crossing R. rutilus females with L. idus males (R. rutilus x L. idus) were larger than those obtained from crossing L. idus females with R. rutilus males (L. idus x R. rutilus) (P < 0.001). At the ages of 1.5 and 3 years the hybrids had a similar body length and weight to L. idus (P>0.05) and a greater body length and weight than R. rutilus (P<0.001). The hybrids of L. idus x R. rutilus were smaller than L. idus and larger than R. rutilus (P < 0.001). Two-thirds of the studied L. idus x R. rutilus hybrid females were sexually mature at age 3, and only one R. rutilus x L. idus hybrid female exhibited signs of cytological maturation. In the control samples, roach females reached sexual maturity, while ide females were immature. The testes of 3-year-old R. rutilus x L. idus hybrid males contained spermatogonia and spermatocytes, while those of L. idus X R. rutilus hybrid males most often contained spermatocytes. The ovaries of female reciprocal hybrids of R. rutilus and L. idus contained not only developing oocytes, but also sex cells which stopped developing at an early stage of gametogenesis. These constituted approximately 50-60% of the area of ovary sections in 13% of the studied females, while in other females they were observed singly. The results obtained indicate that rapid somatic growth exhibited by L. idus is inherited by hybrids to a greater extent through L. idus males than through females. The differences in achieving sexual maturity exhibited by the females of reciprocal hybrids of R. rutilus and L. idus suggest that male genomes may have an important impact on this process.
5

The influence of temperature on the sex differentiation process in peled Coregonus peled [Gmel.]

67%
Krol J., Demska-Zakes K., Hliwa P., Korzeniowska G.
Archives of Polish Fisheries
|
2003
|
tom 11
|
nr 1
The objective of this study was to examine the influence of water temperature (10,17 and 21ºC) on the sex differentiation process in peled. A high temperature, even a sub-lethal one, was not observed to have an influence on the sex ratio in this species; from day 81 after hatching until the end of the experiment the sex ratio in all three experimental groups was 1:1. It was noted, however, that thermal conditions determine the rate of sex differentiation and, in particular, of cytological differentiation. The first female-line cells, oogonia, were observed on day 102 after hatching in the peled kept in water at a temperature of 10ºC. Cytological differentiation was observed in the fish that were reared in higher temperatures as soon as day 81 after hatching. The first symptoms of anatomical differentiation were noted at this time in fish from all experimental groups. Two types of gonads were observed in histological cross-sections; one had a thicker anterior part with the generative and somatic parts located separately (ovaries), and the other had small, spindle-like gonads (future testes). No cytological differentiation of the male sex cells was observed during the experiment.
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