THE BIOLOGY OF SPIDER CRAB, MENAETHIUS MONOCEROS FROM THE RED SEA AND GULF OF AQABA, EGYPT
Awaad
El-Sayed
Zoology Department, Faculty of Science, Al-Azher University, Nasr City, Cairo, Egypt,
author
text
article
1997
eng
Populations of the spider crab, Menaethius monoceros (Latreille,1825) (Majidae Brachyura, Crustacea) from the Gulf ofAqaba and Egyptian coast of the Red Sea were examined. The results show that the individuals of this species usually occur in rocky substrates encrusted among algal growths and within fronds of the sea grasses at sandy areas. The carapace length is small in size ranging from 2.9 to 17.6mm, (without rostrum). Males of this species attaintheir maturity at size from 8 to 12 mm, carapace length. while females become mature at 4 to 8 mm. carapace length The incubated eggs are few in number occurring during all seasons of the year. They varied from 49 to 562 with an average of 269 ± 149 eggs per female. Food consists of algae (brown, red, green as well as cyanophyta ) and animals such as amphipods, copepods, foraminiferans and eggs.There is seasonal variations in the percentage of different food items,and a slight difference between various populations from the two localities.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
1
v.
1
no.
1997
1
16
https://ejabf.journals.ekb.eg/article_3364_d41d8cd98f00b204e9800998ecf8427e.pdf
dx.doi.org/10.21608/ejabf.1997.3364
SOME BIOCHEMICAL PARAMETERS OF HAEMOLYMPH OF XANTHID CRAB, LEPTODIUS EXARTUS AND PORTUNID CRAB, THALAMITA POISSONI FROM THE SUEZ CULF.
Elyamany
E1-Zawahry
Zoology Department, Faculty of Science, Al-A zhar University,Cairo, Egypt.
author
Awaad
El-Sayed
Zoology Department, Faculty of Science, Al-A zhar University,Cairo, Egypt.
author
Samir
Zaaqouk.
Zoology Department, Faculty of Science, Al-A zhar University, Cairo, Egypt.
author
text
article
1997
eng
Glucose, total protein, total lipids, the enzymes sCOT, sGPT, gserum Ca++ and Pi were determined in the haemolymph ofboth Leptodius exartus (H. Mime Edwards, 1834) and Thalamita poissoni Audouin, 1826, individuals that collected from the Gulf of Suez. The studied parameters were 42.22±17.06 mg/dl for glucose,3.92±0.61 g/dl for total protein, 2.37±0.29 g/dl for total lipid,26.02±4.00 lU/I for sGPT, 14.33±2.3 lU for sCOT activities, 79.02±18.38 mg/dl for Ca++ and 7.34±3.21 mg/dl for Fl in L. exartus.While in T. poissoni these values were 98.17±38.34 mg/dI, 3.94±0.59g/dl, 116±0.17 g/d 23.30±0.14 lU/1, 28.60±6.24 lU/I, 69.35±9.78 mg/dl and 23 .30± 14.25, respectively.There are statistically significant differences between the two species in the haemolymph parameter concentrations. Both glucose and total lipid were highly significant, while a significant difference was recorded between sGPT, sGOT and Pi in the two species and no significant difference was detected between total protein and Ca++ in haemolymph of the two species.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
1
v.
1
no.
1997
17
25
https://ejabf.journals.ekb.eg/article_3365_d41d8cd98f00b204e9800998ecf8427e.pdf
dx.doi.org/10.21608/ejabf.1997.3365
MORPHOMETRIC STUDIES ON THREE POPULATIONS OF CORBICULA FLUM1NEA (BIVALVIA: CORBICULACEA) FROM THE IRRIGATION CANAL SYSTEM OF THE RIVER NILE, EGYPT
Mahmoud
Cabal
Zoology Department, Faculty of Science, Ain Shams University,
Cairo, Egypt.
author
text
article
1997
eng
The corbiculid clams have a wide range of distribution throughout most of the world freshwater ecosystems including the Egyptian irrigation system. They displayed great variability in shell morphology that reflects the above wide range of habitats. Accordingly, they are systematically difficult group. The shell morphometry of three populations of Corbicula fluminea (Muller, 1774) from different areas at River Nile canal system, were studied in order to provide a base for its taxonomy. The length-total body and shell weights relationships were different for the three populations. However, all investigated habitats were suitable for the clam survival as indicated by the values of the relative coefficient of condition (Kn) that was about 1.0. The growth parameters of von Bertalanffy growth formula (L, K and t0) were computed for pooled samples of C. fluminea using Chapman method. The estimated life span of this clam extended to about 13 months and included two recruits, one appeared in July and the other in November.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
1
v.
1
no.
1997
26
46
https://ejabf.journals.ekb.eg/article_3366_d41d8cd98f00b204e9800998ecf8427e.pdf
dx.doi.org/10.21608/ejabf.1997.3366
EFFECT OF CERTAIN WATER POLLUTANTS ON THE BIOLOGY OF THE FRESHWATER CLAM CAELATURA ( UNIO ) AEGYPTIACA (BIVALVIA)
Abdalla
Ibrahim
Ain Shams University, Faculty of Science, Zoology Department
author
Setaita
Sleem
Ain Shams University, Faculty of Science, Zoology Department
author
Fatma
Bahgat
Ain Shams University, Faculty of Education, Dept. of Biological Science and Geology
author
Amal
Ali
Ain Shams University, Faculty of Education, Dept. of Biological Science and Geology
author
text
article
1997
eng
The present work is concerned with the effect of different concentrations of two heavy metals; lead and cadmium onCaelatura aegyptiaca (a Bivalve clam). This effect was indicated by assessing the mortality rates after 10 days exposure to certain concentrations, LC50 values, accumulation levels in ctenidia and foot tissues and their histopathological changes in the latter tissues due to the above exposure. The mortality rate was proportional to the concentrations of lead and cadmium in the test aquaria. The accumulated levels were higher in the ctenidia than in the muscle tissues and increased with raising the concentrations of the meta1 salts. The behavior of treated species during the experiment wasabnormal indicating loss of equilibrium during swimming. Histological examinations of the ctenidia & muscles of thetreated clam have revealed various degrees of histopathological changes.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
1
v.
1
no.
1997
47
65
https://ejabf.journals.ekb.eg/article_3367_d41d8cd98f00b204e9800998ecf8427e.pdf
dx.doi.org/10.21608/ejabf.1997.3367
FISH STOCK ASSESSMENT OF OREOCHROMIS NILOTICUS (L) FROM THE RIVER NILE AT CAIRO SECTOR
Adel
Tharwat
Department of Animal Production, Fac. of Agriculture, Cairo University, Giza, Egypt
author
Mohamed
El-Nady
Department of Animal Production, Fac. of Agriculture, Cairo University, Giza, Egypt
author
Carnal
Kamer
Department of Animal Production, Fac. of Agriculture, Cairo University, Giza, Egypt
author
text
article
1997
eng
This study was designed to provide quantitative information about the most important commercial stocks in the River Nile. Due to their economic importance the Nile Tilapia Oreochromis niloticus was the focus of the present study. Production per biomass simulations indicated that the current fishery resources of this species can produce a fish production equivalent to 124% of its biomass on a yearly basis. The current situations of fishing effort in the River Nile is critical as regards to overfishing. The sexually mature fish will decrease to a low level that will cause a breakdown of the propagationcycle in the River Nile. The analysis of fishery population dynamics of O. niloticus in Cairo sector of the River Nile indicated that the current fishery policy causes a total mortality rate (Z) equivalent to 1.12 y-1 in the catch curve. The yield per recruit for O. niloticus during its life cycle indicated that this species can produce a fish yield equivalent to 2633 kg every 1000 kg biomass at age group 025 year during its life cycle which extends to 4 years. The simulation analysisrevealed that the yield per recruit that could be obtained under the different combinations of fishing effort and mesh sizes is optimal when using a fishing rate (F) of 0.6 and mesh size equivalent to age of first capture (Tc) 1.5 years. The gear selectivity study indicated that the trammel net El-Nakaria is selective to optimal total length 13.42 cm, while the trammel net El-Mohair is most selective to optimal total length 18.79cm.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
1
v.
1
no.
1997
67
84
https://ejabf.journals.ekb.eg/article_3368_d41d8cd98f00b204e9800998ecf8427e.pdf
dx.doi.org/10.21608/ejabf.1997.3368
THE ALGAL FLORA OF THE EGYPTIAN OASIS Ш ALGAL FLORA OF THE THERMAL SPRINGS OF BAHARIYA OASIS
A.
Shaaban
Ain Shams University, Faculty of Science , Botany Dept., Cairo, Egypt
author
A.
Hamed
Ain Shams University, Faculty of Science , Botany Dept., Cairo, Egypt
author
B.
Fumanti
Universita Delgi Studi Di Roma “La Sapienza”, Dipartimento Di Biologia Vegetale, Citta Universitaria, 00185 Rom, Italy
author
text
article
1997
eng
The algal flora of six thermal springs of Bahariya Oasis were studied during July 1990 and January 1991. The total algalbiomass was 110. The blue-greens were represented by the greatest number of species followed by diatoms and green algae. Oscillatoria geminata f. sulfurea was the highly distributed taxon in all thermal springs. All springs can be classified as euthermal and Oscillatoria - type. Furthermore most of diatoms recorded were found to be oligohalobien - indifferent to sodium chloride.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
1
v.
1
no.
1997
85
98
https://ejabf.journals.ekb.eg/article_3369_d41d8cd98f00b204e9800998ecf8427e.pdf
dx.doi.org/10.21608/ejabf.1997.3369
MORPHOLOGICAL STUDIES ON THE FRESHWATER SNAIL CLEOPATRA BULIMOIDES (OLIVIER) (PROSOBRANCHIATA -PALUDOMIDAE). 1- THE DIGESTIVE SYSTEM
Magdy
Khalil
Department of Zoology, Faculty of Science, Ain Shams University
author
Reda
Aly
Department of Zoology, Faculty of Science, Ain Shams University
author
text
article
1997
eng
The detailed macro- and microscopic anatomy of the digestive system of the gastropod Cleopatra bulimoides has been yetdescribed for the first time, and the results have been discussed with previous works of other related snails. The digestive system of the snail conforms with the basic plan of organization described for other members of the Cerithioidea. Particular stress has been laid upon specific or generic differences, if any, concerning the structure of the buccal mass, oesophagus, stomach, intestine, rectum and digestive glands.
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
1
v.
1
no.
1997
99
116
https://ejabf.journals.ekb.eg/article_3370_d41d8cd98f00b204e9800998ecf8427e.pdf
dx.doi.org/10.21608/ejabf.1997.3370
MORPHOMETRIC STUDIES AND POPULATION DYNAMICS OF SEPIA DOLLFUSI (CEPHALOPODA : SEPIIDAE) FROM THE SUEZ GULF, RED SEA
Waheed
Emam
Ain Shams University, Faculty of Science, Zoology Department, Cairo, Egypt.
author
Abd El-Halim
Saad
Ain Shams University, Faculty of Science, Zoology Department,Cairo, Egypt.
author
text
article
1997
eng
The cuttlefish Sepia dollfusi was collected from the Gulf of Suez during April 1996 - May 1997. The body and shell measurements for different length groups were determined. The constants (a & n) of the length-weight relationship were 0.4993 and 2.456, respectively. The growth curves of this species indicated that its life span extends to about two years. The parameters of growth (L, K, to & W∞) were computed using different methods. The Bertalanffy growth modelwas recommended to be used for studying the theoretical growth in length and weight for animals belonging to the Family Sepiidae. The overall growth performance (phi prime, Ø ) was 5.778. This can be used to distinguish this species from other related ones. The spawning season of females starts in spring as shown from their gonado-somaticindex. The coefficients of natural, fishing and total mortalities were 2.066, 2.954 and 5.020 per year, respectively. The present study indicated that the stock of S. dollfrsi was slightly overexploited. The yield per recruit was estimated to be 34 g for specimens of age 0.65year at first capture (tc) and with 2.95 per year fishing mortality (F).
Egyptian Journal of Aquatic Biology and Fisheries
The Egyptian Society for the Development of Fisheries and Human Health (ESDFHH)
1110-6131
1
v.
1
no.
1997
117
138
https://ejabf.journals.ekb.eg/article_3371_d41d8cd98f00b204e9800998ecf8427e.pdf
dx.doi.org/10.21608/ejabf.1997.3371