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Preliminary results on the ovarian histology of rabbitfish Siganus rivulatus (Forsskal, 1775) in the southern Aegean Sea, Turkey

Serhat Engin
Serhat Engin
, 
Ozan Soykan
Ozan Soykan
, 
Hasan Cerim
Hasan Cerim
 e 
Anıl Gülşahin
Anıl Gülşahin
   | 25 set 2020
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Article Category: Research Article
Pubblicato online: 25 set 2020
Pagine: 207 - 214
Ricevuto: 12 dic 2019
Accettato: 24 gen 2020
DOI: https://doi.org/10.1515/ohs-2020-0019
© 2020 Faculty of Oceanography and Geography, University of Gdańsk, Poland
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Sampling locations (indicated by black dots) to determine the ovarian histology in the marbled spinefoot from Gökova Bay, the southern Aegean Sea
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
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
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
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
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
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
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
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
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
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

Years Months Sexual maturity stages
2017 February II
March II
April III
May III
June III
July IV
August V
September V
October V
November V
December I
2018 January I
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