1. N. B. Angel, and W. R. Jones (1974 ). Aquaculture of the American eel Anguilla rostrata . Indust. Extens. Serv., N. C. State Univ., Raleigh, 43 -80 .
2. P. L. Attman, and D. S. Dittmar (1974 ). Biological Data Book Vol. 3, Part V, Fish, 2nd Ed. p.1624 -1638 . Bethesda, Maryland: Fed. Am. Soc. Exp. Biol. Handbook.
3. The effect of temperature and mass on routine metabolism in Sarotherodon (Tilapia)mossambicus (Peters)
4. W. J. Dixon, and F. F. Massey (1969 ). Introduction of Statistical Analysis, 3rd Edition . U.S.A.: McGraw-Hill Book Company, p.638 .