الفهرس 
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Abstract
Total wo:tci fish production expands rapid:y. rea::-.ing 122
million 1::mes in 1997 (FAO, 1998). Although aquaculture output
increased dramatically during the last few decades. 7isheries
oroduc1ion registered a slight increase. Supplies for human
consumption increased considerably, rising from 14.3 kg per capu:
(live weight equivalent) in 1994 to 15.7 kg in 1996. (FAO, 1998).
The total fish production in Egypt reached 457o36 to:-.nes in
~he yea~ 1997.of ’wvhich tilapla production was 3o4 i 6o tonnes
Centra: Agency for Public rv1obilfzation and Statistic, (CAPil1AS).
Fish supplies for human consumption in Egypt was 6.95 kg in
1996. (CAPMAS 1997).
Average fish production in Egypt is low when compared with
the average world production, a number of reason accounts for
this among them is the limited fish growing seasons.
Egypt is characterized by hav·1ng a hot tem:Jerate d. mate
v.’here temperature drops during winter months (4 months) below
the range within whicn trlapia fishes can be grown economically
)4 <c Th1.1s the norma: cu:tu:e practce de;:;ends on stocking
:i!sp~c. see::js at the t:Je;in:’.i,ng of ::te v,ra:-T7l seaso:---; of yea:- (i,13:-c’n.
April) and harvesting it at the end of the Deriod (October -
No,.~em8er}. usua:ly b~·i complete pond drainage. The direct
deterrent of this practice is that a large percentage of these fishes
remain below market size at the end of the growing season.