Summary
The thyroid gland of Mystus vittatus and Esomus danricus showed seasonal activity in its epithelial cell height and radioiodine uptake. These two indices of activity agree in E. danricus. Under normal photoperiods both species exhibited two phases of optimum activity, one in April through May, the other in September. The active periods were characterized by high iodine uptake and increased follicular cell height. These peaks of activity alternated with more quiescent phases, minimal iodine uptake and low follicular epithelium. In specimens exposed to constant illumination the active and quiescent phases were advanced by two months. But for this change the general pattern of activity was the same as that in animals kept under normal photoperiodic conditions. Specimens subjected to total darkness showed a higher level of activity throughout the year in comparison to the other two groups. However, a distinct seasonal cycle, which was evident with normal photoperiods and continuous illumination, was absent in total darkness.
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I am greatly indebted to Dr. A. G. Sathyanesan, Banaras Hindu University, for his encouragement, and to Professor S. P. Ray-Chaudhuri, Banaras Hindu University, for providing laboratory facilities.
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Singh, T.P. Seasonal changes in radioiodine uptake and epithelial cell height of the thyroid gland in the freshwater teleosts Esomus danricus (Ham.) and Mystus vittatus (bloch) under varying conditions of illumination. Zeitschrift für Zellforschung 87, 422–428 (1968). https://doi.org/10.1007/BF00333691
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DOI: https://doi.org/10.1007/BF00333691