Histological Analysis of Gonad Maturity of Female Tench (Tinca Tinca L.) From The Žabeni Fish Ponds (Macedonia)

Abstract

The aim of this study was to assess the status of the female tench gonads and presence and morphological characteristics of oocytes during the spawning period. Sampling was conducted on the Žabeni fish ponds during April and July 2013. Different types of follicles with varying dimensions were observed. During April, all types of follicles except the E type were observed. This meant that the individuals were ready for the spawning period. During July, the individuals have already released one batch of eggs, and were ready for the release of another. Results of this research implicate the significance of histological analysis of gonads considering it enables a detailed obserevation of the gonadal sructure and characteristics of oocytes.

Cilj rada je bio da se na osnovu histološke analize gonada ženki linjaka utvrdi njihovo stanje i zastupljenost različitih tipova i morfoloških osobina oocita u toku perioda mresta. Uzorkovanje je vršeno na ribnjaku Žabeni (Republika Makedonija) tokom aprila i jula meseca 2013. godine. Pregledom histoloških preparata utvrđeno je postojanje različitih tipova folikula koji su varirali u veličini i površini. U toku aprila nisu uočeni folikuli E tipa, ali je na osnovu zastupljenosti ostalih tipova, bilo jasno da su jedinke spremne za sezonu mresta. Pregledom uzoraka iz jula utvrđeno da su jedinke prethodno oslobodile najmanje jednu porciju jaja (ikre), kao i da sledi bar još jedna porcija. Dobijeni rezultati ukazuju na značaj histološkog pregleda gonada s obzirom da pruža mogućnost detaljnijeg uvida u strukturu gonada kao i osobine pojedinačnih oocita.