Abstract
The length-weight relationship of Tilapia zillii Gerv., seasonally collected from Lake Mariut (a brackish-water lake), Egypt, has been studied. It was found that mature fishes are fatter than spent individuals, and that this mainly affects the exponent n (W=a L n). While the females are nearly of equal fatness to the males, a higher value of the exponent n is recorded for the females; this is due to the higher weight of the gonads. The smaller fish are more fecundite than the larger, elder individuals; this is revealed by comparison of the condition factor K and GSI (gonadosomatic index) for ripo and spent fish, respectively.
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El Magraby, A. M. and H. H. Saleh: Seasonal variation in the general condition and feeding activities of Tilapia zillii Gerv. from Lake Mariut, Egypt. Notes Mem. Fishery Res. Dir., Cairo 25, 1971. (In press).
El Zarka, S.: Tilapia fisheries investigations in Egyptian Lakes, II. a biological study of the fisheries of Tilapia zillii in Lake Quarun, Egypt. Notes Mem. Fishery Res. Dir., Cairo 66, 1961.
Hile, R.: Standardization of methods expressing length-weight relation of the fishes. Trans. Am. Fish. Soc. 75, 157–164 (1945).
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Communicated by O. Kinne, Hamburg
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Saleh, H.H. A comparative study of the length-weight equation and the condition factor of Tilapia zillii from Lake Mariut, Egypt. Marine Biology 12, 255–260 (1972). https://doi.org/10.1007/BF00346773
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DOI: https://doi.org/10.1007/BF00346773