Abstract
WE have already reported1 that the catfish (Heteropneustes, Clarias) available locally respond to large doses of mammalian chorionic gonadotrophins (‘Physex’: Dumex; ‘Antuitrin S’: Parke, Davis), yielding viable eggs hatching into fry. Having tried the other mammalian hormones available, we wish to record the reactions of catfish not only to them but also to the same hormones used in combination with a threshold dose (vide infra) of catfish pituitary gland. In discussing the action of mammalian hormones, Hoar2 stated that “… fish are so unresponsive to many mammalian (and bird) preparations that it is generally impractical to use them. The fish culturist or physiologist who wishes to hasten gonad development in fish is advised to use fish pituitaries”. However, Kirshenblat3 secured viable eggs of Misgurnus using methyl testosterone, progesterone and deoxy-corticosterone acetate.
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References
Ramaswami, L. S., and Sundararaj, B. I., Acta Anat., 32, 182 (1957).
Hoar, W. S., “The Physiology of Fishes”, 1 (Academic Press, New York, 1957).
Kirshenblat, Ia. D., Dokl. Akad. Nauk. S.S.S.R., 83, 629 (1952) (quoted in ref. 8).
Sundararaj, B. I. “Studies on the Structural Correlation of Fish Pituitary and Gonads and Experiments on inducing Spawning in Fishes”, Ph. D. thesis (University of Mysore, 1957).
Hasler, A. D., and Meyer, R. K., “A Symposium on Hydrobiology” (University of Wisconsin Press, Madison, 1941).
Suzuki, R., Bull. Aichi Gakugei Univ., 6, 31 (1957).
Kawamoto, N. Y., Jap. J. Ichthyol., 1, 8 (1950).
Pickford, G. E., and Atz, J. W. “The Physiology of the Pituitary Gland of Fishes” (New York Zoological Society, New York, 1957).
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RAMASWAMI, L., LAKSHMAN, A. Spawning Catfish with Mammalian Hormones. Nature 182, 122–123 (1958). https://doi.org/10.1038/182122a0
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DOI: https://doi.org/10.1038/182122a0
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