The effect of thyroxine on the larvae and fry of Sarotherodon niloticus L. (Tilapia nilotica)
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Effects of thyroxine (T4) (0.1 ppm; 0.3 ppm; 0.5 ppm) on Sarotherodon niloticus L. yolk sac larvae were studied after 4 weeks of treatment from hatching. T4 at 0.5 ppm accelerated yolk resorption but did not significantly increase growth after the first week of treatment. Increase in length and in weight among fry treated with T4 at 0.1 ppm and 0.3 ppm was significant after the fourth week. T4 at 0.1 ppm increased significantly the length of the pectoral fin; but at 0.3 ppm and 0.5 ppm caused abnormal shapes in the pectoral fins as well as lordosis and scoliosis. T4 reduced pigmentation in treated yolk sac larvae for 3 days only and caused thickening of the epidermis in both treated yolk sac larvae and fry. Thyroid follicles were absent in the yolk sac larvae but present in the fry.
Contribution No. 111 of the Aquaculture Department, SEAFDEC.
Suggested CitationNacario, J. F. (1983). The effect of thyroxine on the larvae and fry of Sarotherodon niloticus L. (Tilapia nilotica).
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