Categories
vol-13SEXUALITY~ REPRODUCTIONAMD FEcUxnni OF
RAJA MJRALETUS (L) FROMTU8 IIElJiTERRA,MlA,N
\VATERS OPF ALSX.6.NDRIA.
S. H. ABD gL-AZIZ, A. EZZAT AND M.O. HVSSEIN’. ;, ;
Faculty of Science, Alexandria University.
ABSTRACT·
The annual breeding cycle of Raja Iffrllletus in
the Egyptian Mediterranean waters was described.
The present results showed that sexual I114tur1ty
. was reached by the mate at 28 c~ oftotall~ngth
(1~ CID disc Width, 13 cm disc lel!gth), and by the
females at 30 cm of total length (19 cm disc width,
15C11\disc lengt~J~ The v1tellogen1c activity starts
in Miy;reaches’ a peakrate fn June, July and August.
Egg laying spreads over elght months. Ovules are
lald .1n ,slJccess1v,= waves. between them are some
rest p~rl·od. It is suggested that temperitJre controls’
t,he r~te ~f. ~gglayl,lI.!1 and v1tellogenlc activity.
, f~cundi~y’\)f ‘ ‘Raja” .traJetus >varles’ between 90
. (maxini~,.’ Ifnd~32 (mfn1muRt). Th.~~· 1$ a” l1neltr
relat10nshlp between size of fish and fecundity
