6 The Functional Morphology of Teleost Gonads
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...The major developmental events occurring during oocyte development can be broadly classi®ed into six phases, according to the state of oocyte growth; they are: oogenesis, primary oocyte growth, cortical alveolus stage, vitellogenesis, maturation and ovulation (Nagahama, 1983; Selman et al., 1986, 1993; Bromage and Cumaranatunga, 1988; Tyler, 1991; Tyler and Sumpter, 1996)....
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...…classi®ed into six phases, according to the state of oocyte growth; they are: oogenesis, primary oocyte growth, cortical alveolus stage, vitellogenesis, maturation and ovulation (Nagahama, 1983; Selman et al., 1986, 1993; Bromage and Cumaranatunga, 1988; Tyler, 1991; Tyler and Sumpter, 1996)....
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...During the primary growth phase, an acellular vitelline envelope develops around the oocyte and continues to differentiate and increase in complexity throughout the remainder of oocyte growth; this layer is often referred to as the zona radiata, zona pellucida or chorion vitelline envelope (Anderson, 1967; Ulrich, 1969; Azevedo, 1974; Wourms, 1976; Tesoriero, 1978; Nagahama, 1983; Riehl, 1984; Wallace, 1985; Bromage and Cumaranatunga, 1988) and eventually forms the tough outer coating of the egg, termed the chorion....
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...The ability of oocytes to sequester VTG on reaching a certain 'critical' size may be a function of the development of patency, that is, the opening of intercellular channels through the follicular tissues to the oocyte surface, thus allowing blood-borne proteins to reach the oocyte surface (Nagahama, 1983; Wallace, 1985; Tyler et al., 1991a), or alternatively, it may be due to the expression of VTG receptors on the oocyte surface at this time....
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...If one considers an oocyte of a rainbow trout during primary growth, it increases in diameter from 10-20/~m to 100-200 #m (Nagahama, 1983; Sumpter et al., 1984); this equates to at least a 1000-fold, and up to a 5000-fold, increase in volume....
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...Cortical alveoli are the first distinct cytoplasmic structures within the oocyte that can be discerned at the level of the light microscope (Wallace and Selman, 1981; Nagahama, 1983; Sumpter et al., 1984; Selman and Wallace, 1989)....
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733 citations
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...However, certain species do seem to have some of the appropriate histochemical and ultrastructural features for steroidogenesis (Nagahama, 1983)....
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...The thecal layer contains fibroblasts, collagen fibers, and capillaries, and, in some species, special thecal cells (Nagahama, 1983)....
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...These cells possess ultrastructural features commonly found in steroid-producing cells such as agranular endoplasmic reticulum and mitochondria with tubular cristae (Nagahama, 1983)....
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698 citations
References
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