بافت شناسي تخمدان ماهي تون زرد باله در منطقه چابهار (درياي عمان )

Histological Study on Ovary of Yellowfin Tuna (Thunnus albacares) in the Gulf of Oman

In the present research which was done during the period of July 1997 to June 1998, histological studies on maturation stages of 40 yellowfin tuna specimen (Thunnus alhacares) were conducted. It was concluded that the ovaries of this fish had the following characteristics; Germination disk were not persent. There were no difference among anterior, posterior and middle parts of maturity stage of ovaries. All observed ovaries were asynchronous. The ovaries had five maturity stages which were as follow: a) Immature b) maturing c) Rippening d) Ripe e) Spent Avarage dimension of oocyte in different stage are as follow: Immature (<20µ); maturing (>40µ); Rippening (<60µ and Ripe (<120µ).