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Histological Study of the Minute Tubercles on Larval Skin Surface of a Korean Endemic Bitterling, Acheilognathus koreensis (Pisces, Cyprinidae), with Its Larval Growth  

Kim, Chi-Hong (Inland Fisheries Ecological Research Institute, NFRDI)
Park, Jong-Young (Faculty of Biological Sciences and Institute for Biodiversity Research, Chonbuk National University)
Park, Min-Kyong (Faculty of Biological Sciences and Institute for Biodiversity Research, Chonbuk National University)
Kang, Eon-Jong (Inland Fisheries Aquaculture Research Institute)
Kim, Jong-Hwa (Inland Fisheries Ecological Research Institute, NFRDI)
Publication Information
Korean Journal of Ichthyology / v.18, no.3, 2006 , pp. 170-177 More about this Journal
Abstract
Morphology and distribution of the minute tubercles projected on the skin surface of larvae with its development was observed in the Korean bitterling, Acheilognathus koreensis, known as an endemic freshwater fish. The epidermis of the larvae consisted of a thin single layer, having smaller basophilic flat or round-flattened basal cells. In between the single cell layer, two or three layers were added and they consisted mainly of large epidermal cells just above basal cells. These large unicellular epidermal cells were mainly scale-shaped and rarely cone-shaped, and do not give any histochemical tests for mucosubstances. They were present in anterior region and most region of yolk sac. Whereas, vestigial epidermal cells were distributed in the body region and the caudal fin-fold region. These two kinds of epidermal cells, called minute tubercles, increased in number and height from Just to 8 days after hatching, but as the larvae develop gradually, they became to reduce. At 31days after hatching of free swimming stage and absolute absorption stage of the yolk sac, the minute tubercles did not exist on the whole skin of the larvae.
Keywords
Korean bitterling; Acheilognathus koreensis; Larva; minute tubercle; skin;
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