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Seasonal Variation of Skin Structure in a Ricefield-dwelling Mud Loach Misgurnus mizolepis (Cobitidae) from Korea  

Oh, Min-Ki (Faculty of Biological Science and Institute for Biodiversity Research, College of Natural Sciences, Chonbuk National University)
Park, Jong-Young (Faculty of Biological Science and Institute for Biodiversity Research, College of Natural Sciences, Chonbuk National University)
Publication Information
Korean Journal of Ichthyology / v.21, no.2, 2009 , pp. 87-92 More about this Journal
Abstract
Histological investigation of seasonal changes of the mucus cells of ricefield-dwelling mud loach Misgurnus mizolepis was carried out on the skin in three regions of the fish: dorsal, lateral, and occipital. Although there were no significant differences in general morphology, the mucus cells of the epidermis showed a severe change in size and number by skin region. The density of the mucus cells was generally the highest in winter and the lowest in summer in all three skin regions. In particular, during two distinct periods, March to April when water is supplied to the ricefields, and August to September when the ricefields become dry after harvest, showed that the change in density and distribution of the mucus cells in both lateral and occipital regions is greater than during any other period. Moreover, the mucus cells for the dorsal and occipital regions temporally increased in size in June during the period of the highest water temperature of the year. Therefore, we may consider these seasonal changes as part of a protective adaptation to overcome extreme environmental conditions and to increase uptake of oxygen by cutaneous respiration.
Keywords
Mucus cell; ricefield; Misgurnus mizolepis; cutaneous respiration;
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Times Cited By KSCI : 3  (Citation Analysis)
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