Growth, mortality and relative yield per recruit of Japanese scad Decapterus maruadsi (Temminck & Schlegel, 1842) in the Gulf of Suez, Red Sea, Egypt
Sahar
Mehanna
National Institute of Oceanography and Fisheries, Fisheries Division, Fish Population
Dynamics Dept., Suez, Egypt.
author
Asaar
El-Sherbeny
National Institute of Oceanography and Fisheries, Fisheries Division, Fish Population
Dynamics Dept., Suez, Egypt.
author
Magdy
Khalil
Ain Shams University, Faculty of Science, Zoology Dept., Cairo, Egypt
author
Mahmoud
Ahmed
National Authority for Remote Sensing and Space Science, Agriculture Applications,
Soil and Marine Science Division, Marine Science Dept., Cairo, Egypt.
author
Sameh
Kafrawy
National Authority for Remote Sensing and Space Science, Agriculture Applications,
Soil and Marine Science Division, Marine Science Dept., Cairo, Egypt.
author
text
article
2015
eng
The stock of Japanese scad Decapterus maruadsi was assessed based on 1864 specimen (combined sexes), collected from the Gulf of Suez during the fishing season 2011/2012. The growth parameters (L∞ & K) have been estimated from length frequency distribution data, and the obtained values were L∞ = 27.31 cm TL and K = 0.53/y. The instantaneous rates of total (Z), natural (M) and fishing (F) mortalities were 1.80, 0.61 and 1.19/y respectively with exploitation ratio (E) of 0.66/y which reflects an over exploitation situation. The estimated length at first capture (Lc) was12.2 cm, while the length at first sexual maturity (Lm) was 12.3 cm. The relative yield per recruit analysis shows that the stock of D. maruadsi is overexploited and needs to develop a management strategy to conserve and optimize its yield.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
19
v.
1
no.
2015
1
6
https://ejabf.journals.ekb.eg/article_2234_7dbd206ec01b9b48713655b87e6a3428.pdf
dx.doi.org/10.21608/ejabf.2015.2234
Morphological, histological and ultrastructural studies on the ovaries of Liza carinata from the suez bay in correlation with its reproductive cycle
Fawzia
Abd El-Rahman
Department of Zoology, Faculty of Science, Ain Shams University, Abbassia, Cairo,
Egypt.
author
Hamza
El-Shabaka
Department of Zoology, Faculty of Science, Ain Shams University, Abbassia, Cairo,
Egypt.
author
William
Rizkalla
Department of Zoology, Faculty of Science, Ain Shams University, Abbassia, Cairo,
Egypt.
author
Mazaya
Abo-Mosallam
Department of Zoology, Faculty of Science, Ain Shams University, Abbassia, Cairo,
Egypt.
author
Azza
El-Ganainy
National Institute of Oceanography and Fisheries, Suez branch, 183, Suez, Egypt.
author
text
article
2015
eng
Liza carinata is considered as a common and economically important Mugilidaefish of the Red Sea. Knowledge of the gonadal cycle in fishes has a great importancein the successful management of fisheries. The present study was undertaken to gainmore information about the morphological, histological and ultrastructural aspects ofthe ovaries of L. carinata during the different seasons of its reproductive cycle in theSuez Bay.The maturity stages of the ovaries of L. carinata can be classified into fourstages, namely: the early post-spawning, late post-spawning, pre-spawning andspawning stages. Besides, L. carinata spawns from late September to late December.Moreover, the oogenesis of L. carinata is divided into seven stages. These stages arethe oogonia, chromatin-nucleolar, early peri-nucleolar, late peri-nucleolar, vacuolated,early yolk globular and late yolk globular stages. In addition, the ovaries also containthe post-ovulatory structures and atretic follicles. The former are formed of thehypertrophied follicular cells after the discharge of the mature ovum, while the latterare formed as a result of the sudden cease growth of the oocytes. The presentobservations may help in understanding the strategy of reproduction of L. carinata inthe Suez Bay that may help in its aquaculture.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
19
v.
1
no.
2015
7
36
https://ejabf.journals.ekb.eg/article_2265_2e463fa5ba82c2ebe1b84e9ef1d95773.pdf
dx.doi.org/10.21608/ejabf.2015.2265
Reproductive cycle of the broomtail wrasse, Cheilinus lunulatus inhabiting coral reef in Hurghada, Red Sea, Egypt.
Ahamad
Azab1
Marine Biology branch, Zoology Depart., Faculty of Science, Al-Azhar
University, Cairo, Egypt
author
Hassan
Khalaf-Allah
Marine Biology branch, Zoology Depart., Faculty of Science, Al-Azhar
University, Cairo, Egypt
author
Mostafa
Mousa
National institute of Oceanography and fisheries, Alexandria
author
Mosab
Ali
Marine Biology branch, Zoology Depart., Faculty of Science, Al-Azhar
University, Assiut branch.
author
text
article
2015
eng
The present study deals with demonstrate the reproductive cycle of the broomtail wrasse, Cheilinus lunulatus which monthly collected from coral reef in Abu Galawa lagoon, Hurghada, Red Sea, during the period from December 2011 toNovember 2012. Results showed that, the averages of male and female gonadosomatic indices (GSI) were gradually increased during spring and summer months. Irregular trend was recorded to the female hepatosomatic index during all months of the year. It may be due to partially spawning in this fish. Shape, weight, size, colour, texture and structure of gonads were changed with the change of maturity stages. The testicular activity can be classified into five stages: immature stage, stimulating spermatogenesis, rapid spermatogenesis, mature (ripe) testis and Spent testis. Seven stages were recognized during the ovarian activity (previtellogenesis, earlyvitellogenesis,mid-vitellogensis, late-vitellogenesis, pre-spawning, ripe and spent stages). The tsticular and ovarian developments were initiated when the day length (photoperiod) and water temperature had begun to increase during March to April. During May to August, however, the gradual increase of both photoperiod and water temperature reached its maximum values, gonads had ensured completion of testicular and ovarian development. It was concluded that Cheilinus lunulatus in Abu-Galawa lagoon of Hurghada, partially spawned during a long spawning season, which extended from May to October. It synchronizes between both males and females with coordination to increasing of both photoperiod and water temperature.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
19
v.
1
no.
2015
37
54
https://ejabf.journals.ekb.eg/article_2236_d7eeafc36199d05d2480283baab24925.pdf
dx.doi.org/10.21608/ejabf.2015.2236
Evaluation of Cladophora laetevirens (Chlorophyta) and Patella caerulea (Mollusca) as bioindicators for heavy metals Pollution at Al-Hanyaa Mediterranean Coast, Libya.
Magda
El-Adl
Botany Department, Faculty of Science, Damietta University-Egypt. Current address:
Botany Department, Faculty of Education (Al-Qubba), Omar Al-Mukhtar University,
author
Ahmed
Bream
Zoology Department, Faculty of Sciences, Al – Azhar University, Nasr City, Cairo, Egypt
author
text
article
2015
eng
This study was designed to evaluate the new record seaweed Cladophoralaetevirens (Dillwyn) Kützing (Chlorophyta: Cladophorales) and Patella caeruleaLinnaeus (Mollusca: Gastropoda) as bioaccumulating agents. The samples of twospecies were collected from polluted and unpolluted (reference) sites from the rockyshores of Al-Hanyaa coasts, Libya. Zinc (Zn), cadmium (Cd), lead (Pb) and copper(Cu) were determined using voltammetric technique. The results exhibited that, Cuoccupied the highest level (559.15 ± 68.55 μg g-1 fresh weights) among metalsaccumulated by Cl. laetevirens in polluted site, followed by Pb and vice versa inunpolluted site, where Pb attained 179.71 ± 31.19 μg g-1 fresh weight. Despite that Cdhas minimal concentration levels (either in Cl. laetevirens or P. caerulea tissues, atboth sites), it recorded maximal bioaccumulation factors (BAFs) for Cl. laetevirens inboth sites. Metal pollution index (MPI) recorded in a descending order as: Cl.laetevirens > P. caerulea gut > P. caerulea muscle for both sites. Cadmium waspositively correlated with Cu and Pb in both sites. The present data and their analysisproved the consistency, appropriateness, tolerance and reliability of Cl. laetevirens asa bioindicator regardless the metal concentration levels in seawater. These resultsconfirmed that Cl. laetevirens is the strongest accumulator for Cu, Pb and Cd while P.caerulea is a potential accumulator for Zn.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
19
v.
1
no.
2015
55
63
https://ejabf.journals.ekb.eg/article_2246_d04e0107c39483556ba14354900d1d15.pdf
dx.doi.org/10.21608/ejabf.2015.2246
Morphological and histological studies on the pituitary gland of Liza carinata from the Suez Bay (Red Sea, Egypt), with special reference to the gonadotrophs
Fawzia
Abd El-Rahman
Department of Zoology, Faculty of Science, Ain Shams University
author
William
Rizkalla
Department of Zoology, Faculty of Science, Ain Shams University
author
Hamza A.
El-Shabaka
Department of Zoology, Faculty of Science, Ain Shams University
author
Azza A.
El-Ganainy
National Institute of Oceanography and Fisheries, Suez branch
author
Mazaya E.
Abo-Mosallam
Department of Zoology, Faculty of Science, Ain Shams University
author
text
article
2015
eng
The teleosts pituitary gland has a peculiar structure that shows wide variability of its morphology and cellular organization. Moreover, the pituitary gland usually displays seasonal changes during the reproductive cycle. So, the present study is designed to identify and localize the different cell types of the pituitary gland of mature male and female of Liza carinata from the Suez Bay and to study the possible variations that found during its reproductive cycle. The result revealed that the pituitary gland of L. carinata is of the platybasic type, which lacks a distinct hypophyseal stalk, and is differentiated into two main divisions, namely: the adenohypophysis and neurohypophysis. The glandular adenohypophysis consists of five main cell types, the lactotrophs, somatotrophs, gonadotrophs, thyrotrophs and melanotrophs. On the other hand, the neurohypophysis is formed of nerve fibres and contains a variable amount of neurosecretory granules. Moreover, the principal seasonal variations take place in the meso-adenohypophyseal gonadotrophs and the neurosecretory granules.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
19
v.
1
no.
2015
65
82
https://ejabf.journals.ekb.eg/article_22871_079c4a3cdde1a99ef3bb023f9538ce53.pdf
dx.doi.org/10.21608/ejabf.2015.22871
Reproductive biology of the Salema, fish Sarpa salpa (Osteichthyes: Sparidae) along the eastern coast of Libya.
Salah
El-Etreby
Marine Science Dept., Faculty of Science, Suez Canal University, Egypt
author
Ashraf
Ahmed
Marine Science Dept., Faculty of Science, Suez Canal University, Egypt
author
Magdy
Alwany
Marine Science Dept., Faculty of Science, Suez Canal University, Egypt
author
Randa
Ali
Omar Elmoktar University, Libya
author
text
article
2015
eng
In the current work, the overall ratio between males and females of Sarpa salpawas 1:0.32. The first sexual maturity of males was recorded at length group (21.1-24cm) by 66.6% and the female was recorded at length group (24.1-27) by 50%.Ovaries of S. salpa were examined. The smallest mature female had a total bodylength of 29 cm and 387.73 gm weight with absolute fecundity of 2,978,440 eggs. Thelargest female had total body length of 39 cm and body weight of 918.86 gm withabsolute fecundity 1,685,729 eggs. Based on the results of maturity stages, gonadosomaticindices (G.S.I) and ova diameters, the study showed clearly that spawningseason of S. salpa in the Libyan coast of the Mediterranean waters extends fromOctober to December.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
19
v.
1
no.
2015
83
94
https://ejabf.journals.ekb.eg/article_2248_0fdb08bb59903c065050c79b68ec65da.pdf
dx.doi.org/10.21608/ejabf.2015.2248