Characteristics of atresia were observed in early and late vitellogenic
oocytes (atresic immature oocytes), and in mature oocytes (atresic mature oocytes), beginning in April and throughout gametogenesis and postspawning resorption (Fig.
These strategies relate to the pattern and time lag in which the pre-vitellogenic
oocytes (primary growth) are recruited to compose the stock of vitellogenic
oocytes (secondary growth).
stage, the oocytes began to increase in size, due to accumulation of yolk.
diameter of vitellogenic
oocytes, the pellucid zone thickness and the follicular cell height, we selected 50 undamaged oocytes without retraction and with cuts crossing the nucleus for each of the studied species.
Anatomy and histology of reproductive organs of female Homalodisca coagulata (Hemiptera: Cicadellidae: Proconiini), with special emphasis on categorization of vitellogenic
5%) exhibited early vitellogenic
oocytes in their testes (Fig.
Among reproductively active fish, oocytes in various stages of development including vitellogenic
oocytes were present while the gonad of post-spawning fish were characterized by the presence of yellow-brown bodies and large, centrally located gonadal lumen (Figure 3 a, b).
Primary growth oocytes, cortical alveolar oocytes, Primary vitellogenic
oocytes, and secondary vitellogenic
oocytes were present.
The presence of elevated GSIs and mature, vitellogenic
oocytes was used to estimate reproductive season in weeks for each population of fishes.
The number of pre-vitellogenic
oocytes were positively correlated with female total weight and length, and ovary weight in both species.
1]) to remove interfering substances such as the feces and blood, celomatic liquid, vitellogenic
material and any microorganisms (Tabata & Portz, 2004).
Mature females that had vitellogenic
oocytes, hydrated oocytes, or postovulatory follicles were characterized as females that were expected to spawn in the current spawning season.