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Figure 1
Sampling locations (indicated by black dots) to determine the ovarian histology in the marbled spinefoot from Gökova Bay, the southern Aegean Sea
Figure 2
Length–weight relationship for female marbled spinefoot from the southern Aegean Sea
Figure 3
Monthly gonadosomatic index (GSI) for females of the marbled spinefoot Siganus rivultaus in the southern Aegean Sea
Figure 4
Mature (stage IV) female marbled spinefoot sampled from the southern Aegean Sea
Figure 5
Six-month ovarian cycle of S. rivulatus. While ovarian cells in the first and second development phase were observed in June and July, only the first development stage and mitotic ovarian cells were found during the other months; A – June, B – July, C – August, D – September, E – October, F – November; scale – 50 μm
Figure 6
Six-month ovarian cycle of S. rivulatus. While ovarian cells of the first and second development phase were observed in April and May, only the first development stage and ovarian cells were found during the other months; A – December, B – January, C – February, D – March, E – April, F– May; scale – 50 μm
Figure 7
First development phase of ovarian cells; A – chromatin-nuclear period, B – chromatin-nuclear period, perinuclear period; scale – 30 μm
Figure 8
Components of ovarian cells; A – post-vitellogenesis period, B, C – perinuclear period, Pa – perinuclear area, Kr – chromatin, N – nucleus, Nu – nucleolus, Te – theca cells, Gr – granulosa cells, Zr – zona radiata, F – follicle
Figure 9
First stage of the second development phase, early vitellogenesis; yolk phase I; A: cortical alveoli phase, B: accumulated vitellin globules around the nucleus observed during the period of cortical alveoli; Ka: cortical alveoli, Zr: zona radiata; scale: 30 μm
Figure 10
Maturing phase of ovarian cells; A – accumulated fat globules around the nucleus, B – fat globules come together and form fat droplets, C – movement of the germinal vesicle into the animal pole O – oil droplets, Vg – vitelline globules; scale: 10 μm
Monthly changes in the sexual maturity stages of Siganus rivulatus in the southern Aegean Sea