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Development and Transformation of Oocyte' Follicle Cell for Korean Four Sillurid Fishes of Liobagrus and Pseudobagrus (Pisces: Silluriformes)  

Baek, Hyun-A (Faculty of Biological Sciences and Institute for Biodiversity Research, Chonbuk National University)
Park, Jong-Young (Faculty of Biological Sciences and Institute for Biodiversity Research, Chonbuk National University)
Kim, Chi-Hong (Inland Fisheries Ecological Research Institute, NFRDI)
Kim, Jong-Hwa (Inland Fisheries Ecological Research Institute, NFRDI)
Publication Information
Korean Journal of Ichthyology / v.19, no.2, 2007 , pp. 112-119 More about this Journal
Abstract
A histological study on development and transformation of the oocyte' follicle cell for Korean four sillurid fishes, Liobagrus obesus, L. mediadiposalis, Pseudobagrus koreanus, and P. brevicorpus was performed by light and electron microscopes. The follicular layer surrounding the oocyte consisted of an outer theca cell and an inner follicle cell (granulosa cell). The follicle cells of the oocyte were flatten cells at early oocyte but during vitellogenesis they were transformed it to a single layer of cuboidal cell, then to a single columnar cell layer, and finally to a layer covered with a substance secreted by themselves. Although the development and transformation of the follicle cells was similar to four species, the secreted materials, called an adhesive membrane, were divided into two types in its appearance and nature. Firstly, a jelly coat-like type was found in L. obesus and L. mediadiposalis, which they are presumed to be polysaccharides and mucoproteins in its nature and secondly, a granular type in P. koreanus and P. brevicopus, being mucoprotein. A zona radiata with about $0.6{\sim}3.1{\mu}m$ thin was present below the adhesive material secreted by the transformed-follicle cell's activity. The zona radiata was composed of two layers, a thin externa and a thick interna.
Keywords
Sillurid fishes; oocyte; follicle cell; adhesive material; zona radiata;
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