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Distribution of mucous cells on the body surface of Japanese flounder Paralichthys olivaceus

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The distribution of mucous cells was examined in the skin on the ocular and blind sides of Japanese flounder Paralichthys olivaceus. Observations were performed on both body sides at the following regions: cheek, lower jaw (blind side), gill cover (ocular side), dorsal side, lateral line, belly and caudal peduncle. The mucous cells observed were elliptic and positively stained for periodic acid Schiff reaction and Mayer's mucicarmine and showed a higher density and larger size on the ocular side compared to the blind side. Low densities of mucous cells were observed on the lower jaw compared with other regions of the body. The depth of the crack located between scales was deeper on the ocular side than the blind side, which might reflect total epidermis area and total number of mucous cells. Bacterial infection elucidated some information on the effect on the density and size of mucous cells, where the density and size decreased slightly after infection. Only the lower jaw, however, showed an increased number of mucous cells. The results show that the potential of skin to secrete mucus is higher on the ocular than on the blind side and bacterial infection decreases mucous secretion.
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Keywords: epidermis; infection; skin

Document Type: Regular Paper

Affiliations: Fish Disease Laboratory, Department of Aquaculture, Kochi University, Nankoku, Kochi, Japan

Publication date: 2011-03-01

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