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Vol-8AGE AND GROWTH OF ALESTES DENTEX L. (CHARACIDAE)
AT JEBEL AULYlA RESERVOIR, SUDAN.
• R. M. BISHAI
Department of Zoology. Faculty of Science. Mansoura University.
Mansoura. Egypt.
ABSTRACT
Age. growth and length-weight relationship of A. dentex
from Jebel Au1yia Reservoir. on the White Nile in the Sudan.
have been determined by the analysis of size-frequency
distribution, scale and length-weight studies of 7580,
1441 and 1633 fish. respectively. Validity and factors
affecting ring formation were studied. The average length
and wei ght of A. dentex I. II. II r. IV and V age-group
is 17.1, 19.3. 24.6. 28.5 and 30.8 em; and 65.1. 89.9.
169.5. 241.6 and 275.3 gm, respectively. The oldest fish
examined was six years old and 32 em long. A. dentex reaches
its cOllll1erci a1 size by the end of its fourth year of life.
The body-scale relation is a straight line with an intercept
of 0.8 em. Weight of a mixed sample captured in several
months increases as the 3.347 power of the length. Females
slightly dominated age-group r. but females were more
numerous in the older age-groups.
