International Journal of Aquaculture, 2016, Vol.6, No.6, 1
-
10
1
Research Article Open Access
Ovarian Development and Sex Steriod Hormones in the Keeled Fish
Liza
carinata
(Valenciennes, 1836) From Suez Bay, Egypt
Amira Salah El-Din Hefny
1
, Osama Ahmad Abass
2
, Magdy M. El-halfawy
1
, Mohamed Wafeek
3
, Mohamed A. Abu El-Regal
4
1 Fish reproduction and breeding Lab., Aquaculture Division, National Institute of Oceanography and Fisheries, Suez, Egypt
2 Zoology Department, Faculty of Science, Port Said University, Port Said, Egypt
3 Department of Reproductive Physiology, Central Laboratory for Aquaculture Research,Agriculture Research Center, Egypt
4 Marine Science Department, Faculty of Science, Port Said University, Port Said, Egypt
Corresponding author Email:
International Journal of Aquaculture, 2016, Vol. 6, No.6 doi
Received: 22 Mar., 2016
Accepted: 20 May, 2016
Published: 15 Nov., 2016
Copyright © 2016
Hefny et al., This is an open access article published under the terms of the Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article
:
Hefny A.S.E.D., Elhalfawy M.M., Abass O.A., Wafeek M., and El-Regal M.A.A., 2016, Ovarian development and sex steriod hormones in the keeled fish
liza
carinata
(valenciennes, 1836) from Suez Bay, Egypt, International Journal of Aquaculture, 6(6): 1-10 (doi
Abstract
This work aims to investigate the microscopic structures of ovaries of
Liza carinata
collected from Suez Bay during
annual cycle combined with the relation between GSI (gonadosomatic index) and sex steroid hormones concentration for female
during the study period. The oocyte maturation showed the following phases; first growth phase which includes chromatin-nucleolus
stage, early and late perinucleolus stages. Second growth phase includes vacuolization stage (yolk vesicle stage), yolk stages
(primary, secondary and tertiary), and ripe stage. The maturity stages of ovary recorded and classified into seven stages (Immature,
Immature & Recovering, Developing, Maturing, Mature, Spawning and Spent). The cyclic changes in GSI indices are considered as
further a proof that the spawning season is extending from November (8.88%) to March with value (0.62%). Sex steroids hormones
play a role in controlling the maturation cycle in teleost especially during spawning times, which altered by environmental or
hormonal manipulation. 17β - Estradiol levels in female
L. carinata
ranged from maximum value 0.199 ±0.087 ng/ml recorded in
maturing stage to 0.102 ±0.016 ng/ml ml in December 2012. The lowest value of testosterone was observed in February with value
(17.4 ±1.054) in spawning and spent stages of maturity.
Keywords
Liza carinata
; Oocyte maturation; Oogenesis; Gonadosomatic index; Sex hormones; Suez Bay
1 Introduction
Liza carinata
belongs to family Mugilidae. That consists around the world of more than 72 species from 17 fish genera
(Nelson, 2006).
Liza carinata
is one of the commercially important fish species in Suez Bay and Egypt, although it has
a lower growth rate, fetches a higher market price compared to the other mullet in Egypt because of its highly
appreciated taste. Numerous investigations have been conducted on Mullet species such as (Abou-Seedo and Stephen,
2004) studied the
Liza klunzingeri
reproductive cycle, (El-Halfawy et al., 2007) studied the reproductive biology and
histological character of
L.ramada
, (Liu et al., 2009) investigated the histological demography of
Mugil cephalus,
(Hakimelahi et al., 2011) studied the reproductive biology of female
Liza klunzingeri
and (El-Ganainy et al., 2014)
studied the reproductive biology of
L.carinata
in Suez bay.
The oogenesis is a very dynamic process in the ovaries, in which the oocyte passes through various phases of the
development that are very similar in different fish species. The fish oocyte development can be divided into oocyte
growth and oocyte maturation. Vitellogenesis plays an important role in the oocyte growth. Germinal vesicles migrate
and breakdown, coalescence of lipid droplets and yolk globules, and release of the 1st polar body are the characteristic
event in the process of maturation (Weltzein et al., 2002).
Histological investigations of female gonads have been conducted on Mullet species (Sung et al., 2004; Assem et al.,
2008; Yelghi et al., 2012) studied the development of ovary and oocyte growth in
Mugil cephalus
. (Mônica Rocha et al.,
2011) studied the ovarian development of
Mugil curema
. (Erdinçet al., 2011) demonstrated the histological changes in
Liza abu
. Although Egypt recorded as a first mullet aquaculture production it reached (4.43, 5.95, 5.93) percent in
