南米産淡水エイ類Potamotrygon spp.の間腎腺組織〔英文〕

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Fat droplets are abundantly detectable as cellular inclusion in the interrenal glands of marine elasmobranchs. On the contrary, the glands of teleosts are devoid of these droplets. South American freshwater stingrays Potamotrygon spp. have resided in freshwater environment for very long periods. Consequently, they have abandoned urea retention and their constituents of body fluids are similar to those of teleosts in fresh water. Using six specimens of the stingrays, the present investigation was done to clarify whether the histochemical feature of the interrenal gland is teleostean type or marine elasmobranch. As the result, considerable amount of fat droplets was detected in the cells by Oil Red O stain. This indicates that the interrenal gland of the fresh-water stingrays is also of the marine elasmobranch type, even though the stingrays have been isolated far back in the past from marine environment.
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