oa African Zoology - Embryonic adaptations and nutrition in the viviparous teleost Clinus dorsalis (Perciformes: Clinidae)

Volume 21, Issue 1
  • ISSN : 1562-7020
  • E-ISSN: 2224-073X



Embryos of Clinus dorsalis absorb nutrients from the embryotrophe, secreted by the follicular epithelium. Autoradiographic studies revealed that the principal areas of nutrient absorption are the embryonic gut and epidermis. A histological and electron microscopic study of embryonic structura revealed an extensively hypertrophied gut with numerous fingerlike villi projecting Into the gut lumen. A brushborder of microvilli is, furthermore, characteristic of the columnar gut epithelium. Epidermal surface area is increased apically on individual epidermal cells, particularly on the ventral pericardial surface. Microridges further increase epidermal surface area. Epidermal surface area is reduced and a mucous layer is secreted prior to parturition.

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