SEASONAL VARIATION OF MITOSIS IN PROLIFERATE

COMMON CARP TISSUES

Carmen Leane Nicolescu

KEY WORDS: mitosis, seasonal variation, proliferate tissues, common carp, mitotic index

ABSTRACT

The seasonal variation of mitosis in proliferate common carp tissues (haemopoetic kidney, gill epithelium, scale epithelium) was analysed. Mitotic figures were obtained using the direct preparation technique and  air dried technique. The mitotic index was analysed each 2 month during 3 years. There were analysed fish from natural and pound populations. The rate of individuals with cell division had a seasonal variation (2.3-10.6) being maximal in summer. There was obtained mitotic figures in all analysed proliferate tissues from the same individuals. In kidney were obtained mitotic figures from more individuals. The mitotic index had also a seasonal variation. It was maximal in summer (Julie) and in the early autumn and minimal in winter and early spring. The seasonal variation can be described by a polynomial regression. Between different kinds of proliferate tissue there was also a seasonal variation. The highest mitotic index was observed in kidney. There was a large variation of the mitotic index between different proliferate tissues and between individuals.