Categories
vol-33REPRODUCTIVE BIOLOGY AND HISTOLOGICAL STUDIES OF
THE GREY MULLET, LIZA RAMADA, (RISSO, 1826) IN LAKE
TIMSAH, SUEZ CANAL
MAGDY M. EL-HALFAWY*, AMAL M. RAMADAN, WAHEED F. MAHMOUD
National Institute of Oceanography and Fisheries, Red Sea and Aqaba & Suez Gulfs,
Elhalfawy2006 @ yahoo.com
Keywords: Liza ramada, Reproductive biology, Histology, Lake Timsah.
ABSTRACT
Reproductive characteristics of Liza ramada in Timsah Lake showed that the male
reaches first sexual maturity smaller than the female at a total body length of 14 cm. and 16
cm., respectively. Overall sex ratio is 1: 1.7 for males to females. The gonado-somatic
index of males was lower than that of females. Where, the maximum GSI values were
recorded in November 5.03 % and 12.4 % for males and females, respectively. The
maturity stages of male and female Liza ramada are morphologically separated according
to the changes in shape, size and colour of the gonad in different successive stages. These
stages are virgin, maturing virgin, developing, developed, gravid and spent stages.
Histologically, the oocyte maturation showed the following phases; first growth phase
which includes chromatin stage, early and late perinucleolus stages. Second growth phase
includes vacuolization stage, yolk stages (primary, secondary and tertiary), mature stage
and ripe stage. The testes maturation classified into spermatogonia, primary spermatocytes,
secondary spermatocytes, spermatids and spermatozoa. Different points of view which take
place in this work show that of the spawning season of Liza ramada in Timsah lake which
may be extending from November to January.
