Ontogenesis of cytological structures around the yolk sac during embryologic and early larval development of some cichlid fishes
Ontogenesis of cytological structures around the yolk sac during embryologic and early larval development of some cichlid fishes
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一些慈鲷胚胎和早期幼体发育过程中卵黄囊周围细胞结构的个体发生
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
L. Fishelson
中科院分区：
文献类型：
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作者：
L. Fishelson
卵黄囊周围的细胞结构的个体发育，其次是在三个物种的慈鲷，bottomspawner，罗非鱼zillii，和两个mouthbrooders，父母Sarotherodon galilaeus和母亲的Pseudotropheus johanni。描述了胚胎发生的初始阶段和发展中观察到的核仁释放到受精从卵germinal囊泡到蛋黄，和他们的参与酶的食物代谢。注意力集中在一个特殊的微绒毛网络，从卵黄周合胞体向过度生长的卵黄囊血网的发展和退化。于T. zillii在受精后16- 18小时开始;在卵较大、发育较慢的中华对虾中，受精后38-40 h开始。延伸的微绒毛与卵黄囊毛细血管建立紧密接触，从而使食物从卵黄运输到发育中的胚胎。微绒毛层的退化开始于自由游动的幼虫，在6-7日龄时分散在底产卵鱼中，在14-16日龄时分散在口孵鱼中。
Ontogenesis of cell structures around the yolk sac was followed in three species of cichlids, the bottomspawner, Tilapia zillii, and two mouthbrooders, the parental Sarotherodon galilaeus and the maternal Pseudotropheus johanni. A description is given of the initial stages of embryogenesis and developments observed in the nucleoli released towards fertilization from the egg germinal vesicle into the yolk, and their participation in enzymatic food metabolism. Attention was focused on the development and involution of a special microvillar network that evolves from the perivitelline syncytium towards the overgrowing yolk sac blood net. In T. zillii this commences 16–18h after fertilization; in S. galilaeus 30–32 h after fertilization; and in P. johanni, with larger eggs and slower development, it commences 38–40 h after fertilization. The extending microvilli establish close contact with the yolk sac blood capillaries thus enabling food transport from the yolk to the developing embryo. Involution of the microvillar layer begins in free-swimming larvae, dispersing in bottomspawners at age 6–7 days, and in mouthbrooders at 14–16 days.