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

• Autorzy: Krol J , Demska-Zakes K , Hliwa P , Korzeniowska G
• Języki publikacji: EN

Abstrakty

EN

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.

PL

Badania nad zależną od temperatury determinacją płci prowadzono dotychczas na gatunkach ryb, u których występuje gonochoryzm niezróżnicowany, a dyferencjacja płci przebiega w sposób pośredni. U pelugi, gatunku będącego obiektem badań, dyferencjacja płci przebiega w sposób odmienny - niezróżnicowane zawiązki gonad przekształcają się bezpośrednio w gonady samicze lub samcze. W niniejszej pracy nie zaobserwowano wpływu subletalnie wysokiej temperatury wody na stosunek płci u pelugi (tab. 1). Potwierdzono natomiast, iż wzrost temperatury środowiska poprzez zwiększenie tempa wzrostu, wpiywa pośrednio na tempo różnicowania się płci. Symptomy anatomicznej dyferencjacji gonad zauważono w 81 dniu po wykluciu u ryb ze wszystkich grup doświadczalnych (fot. 2,3). W tym samym czasie nastąpiło także różnicowanie cytologiczne komórek płciowych pelug przetrzymywanych w wyższych temperaturach (17 i 21°C) (fot. 4). U ryb podchowywanych w najniższej temperaturze wody (10°C) pierwsze żeńskie komórki płciowe - oogonia obserwowano dopiero w 102 dniu po wykluciu. Do czasu zakończenia eksperymentu nie odnotowano różnicowania się męskich komórek płciowych - spermatogoniów.

Słowa kluczowe

EN

fish; water temperature; anatomical differentiation; differentiation process; sex; sex differentiation; environment condition; peled; gonad; temperature; Coregonus peled; male; sex cell

• Wydawca: -
• Czasopismo: Archives of Polish Fisheries
• Rocznik: 2003
• Tom: 11
• Numer: 1
• Opis fizyczny: p.23-31,fig.,ref.

Twórcy

autor

Krol J

• University of Warmia and Mazury in Olsztyn, Oczapowskiego 5, 10-957 Olsztyn, Poland

autor

Demska-Zakes K

• University of Warmia and Mazury in Olsztyn, Oczapowskiego 5, 10-957 Olsztyn, Poland

autor

Hliwa P

• University of Warmia and Mazury in Olsztyn, Oczapowskiego 5, 10-957 Olsztyn, Poland

autor

Korzeniowska G

• University of Warmia and Mazury in Olsztyn, Oczapowskiego 5, 10-957 Olsztyn, Poland

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