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Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
1999
3
2
EFFECTS OF THE INSECTICIDE, DIAZINON ON THE HEPATOPANCREAS OF THE FRESHWATER CRAYFISH PR OCAMBARUS CLARKII
Fadia
Heiba
This study was carried out to show the histopathological alteratious induced in the hepdtopancreas of the crayfish Procambarus clarkil exposed to the insecticide, diazinon. The hepatopancreas is normally formed of tubules that are composed of digestive and secretory cells. The digestive cells contain vacuoles and some of them have yellowish brown granules that probably represent residual bodies of lysosomes, Exposure of crayfishes to increasing concentrations of diazinon has led to numerous pathological alteiations in the hepatopancreatic cells especially the digestive cells. The tubules appear widely separated by connective tissue, while the cells are more vaculated and characterized by loss of cytoplasmic density and presence of numerous yellow granules. The degeneration of the cells was more pronounced at 1/2 LC50 / day for 4 days of diazinon. The crayfishes exposed to sublethal levels for long period showed slight changes in the hepatopancreas. This indicates that the alterations are dependent on both the insecticide concentration andthe exposure time.
Crayfish
Procambarus clarkii
hepatopancreas
histopathology
Diazinon
1999
04
01
197
213
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
1999
3
2
HEAVY METALS POLLUTION ALONG THE RED SEA COASTS OF EGYPT
Mohamed
Hamed
KhaIid
EI-Moselhy
Water and sediments samples were collected from the Egyptian coasts of the GuIfs of Suez and Aqaba and Red Sea proper during June 1998. The results show that: The average concentration of Cu, Zn, Pb, Cd, Cr, Ni, Co, Fe and Mn in the Gulf of Suez were 5.60, 15.46, 1.36, 0.662, 0.628, 4.65, 0.568, 16.46 and 5.81 g/1 in water and 9.34, 38.28, 13.75, 3.62, 12.25, 19.32, 16.21, 1024.7 and 35.26 g/g in sediments, respectively. The corresponding averageconcentrations in the Gulf of Aqaba were 2.98, 6.77, 0.492, 0.223, 0.31, 2.5 1, 0.246, 10.94 and 3.07 g/l in water and 3.91, 17.81,5.87, 1.69,4.92,6.67,6.28, 1391.8 and 40.47 g/g in sediments. In the Red Sea proper, the average concentrations of the heavy metals were 3.66, 11.04, 0.902, 0.29, 0.549, 3.29, 0.369, 14.15 and 4.30 g/l in waterand 6.60, 29.97, 11.24, 3.06, 8.32, 13.75, 13.52, 1386.1 and 44.91 g/g in sediments. In comparison with the Aqaba Gulf and Red Sea proper, heavy metals concentrations in the Gulf of Suez particularly at the northern part (Suez Bay) were relatively high. These high concentrations may be attributed to the sewage disposal from the cityof Suez and ships awaiting transit through the Suez Canal, in addition to waste effluents from the industrial complex south of Suez, which includes oil refineries, fertilizer company and power stations.
Red Sea
Suez and Aqaba Gulfs
Heavy metals
water
sediments
1999
04
01
1
20
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
1999
3
2
BACTERIAL POLLUTION OF RIVER NILEWATER (ROSSETTA BRANCH)
Shawky
Sabae
Four stations were chosen to study the bacterial pollution of the River Nile, Rossetta branch. The results revealed that El- Rahawy drain is one of the main sources of pollution of Rossetta branch. The turbidity of the water and bacterial populations increased afer the discharge point of the drain. The data showed that the transparency of the Nile waters reached its minimal value at about 2 Km beyond the drain(30 cm ). On the other hand, the viable bacterial counts, beyond the discharge point of the drain, reached 250 x 106/ ml and 383 xl 06 /ml for incubation temperatures 22°C and 37°C, respectively. The total and faecal coliform counts reached 350 x104 I 100 ml and 90 x104 /100 ml water, respectively. Faecal streptococci counts reached 450/ lOOml afier the drain's discharge point. Thus, sewage effluentsof El-Rahawy drain should be subjected to intensive treatment before being discharged into the Rossetta branch.
bacterial pollution
River Nile
Rosetta Branch
1999
04
01
21
34
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
1999
3
2
POPULATION DYNAMICS OF THE ROUND SCAD DECAPTERUS MACROSOA (BLEEKER, 1851), IN THE GULF OF SUEZ, EGYPT.
Sahar
Mehanna
Age and growth of Decapterus macrosoma from the Gulf of Suez were studied by otolith-reading method. There is no difference in age and growth between the two sexes. The oldest males and females were 4+years. The mean back - calculated total lengths at the end of different years of life were estimated. The growth parameters of thevon Bertalanffy growth equation were K - 0.557 year-1, L= 26.97 cm and to = -0.059 year. The mean instantaneous total mortality coefficient “Z,” computed by two different methods was found to be 1.107 year-1. The natural mortality coefficient, fishing mortality coefficient and exploitation rate were estimated. The yield per recruitwas computed using the model of Beverton and Holt (1957). The results indicate that, the D. macrosoma population in the Gulf of Suez is overexploited.
Carangidae
Decapterus macrosoma
Age
Growth
mortality rate
exploitation rate
yield per recruit
1999
04
01
55
68
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
1999
3
2
LEVELS OF SOME HEAVY METALS IN COASTAL WATER,SEDIMENT AND THE LIMPET PATELLA SP. FROM THE NORTHERN PART OF THE GULF OF SUEZ (SUEZ BAY)
EL-Moselhy
M.
Mohamadein
I.
Diab
A.
Tolba
R.
Evels of Cd, Cu, Co, Ni, Pb, Fe and Zn were estimated in coastal water, sediment and soft tissues of the limpet Patella sp. from 8 stations in Suez Bay (northern part of the Gulf of Suez) during 1997- 1998. The results indicate that, the land-based activities and the ships waiting in the area are the main sources of metal pollution in the bay.Variation of metals in water, sediment and Patella sp. was not substantial among different stations and during various seasons. Station VII was the only site that displayed maximum values of Pb in water sediments and Patella sp. (3.448 g/g, 91.16 g/g and 44.879 g/g, respectively).
Heavy metals
water
Sediment
Patella sp
Gulf of Suez
1999
04
01
69
84
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
1999
3
2
EFFECT OF SALINITY ON PROLACTIN AND GROWTH HORMONE CELL ACTIVITY IN THE PITUITARY GLAND OF MUGIL CEPHALUS
Mostafa
Mousa
Abdalla
EI-Shebly
Mohamed
Khalil
The influence of the environmental salinity on the prolactin (PRL) and growth hormone (GH) cells of the adenohypophysis of the grey mullet (Mugil cephalus) adapted to seawater (SW, 35 ‰) and fresh water (FW, 0-0.5 ‰) has been studied by immunocytochemical technique. The results indicated that PRL and GH cells of fish adapted to FW occupied a greater hypophysial region and have larger nuclear areas than those of SW-adapted fish. In addition, the activity of bothPRL and GH cells in FW ponds was higher than those of SW ponds. Consequently, the FW-adapted fish exhibiting higher condition factor (1.05 in FW, 0.96 in SW) and with higher percentage of protein content (61.41 % in FW, 48.23 % in SW).
lmmunocytochemistry
prolactin
Growth hormone
Pituitary gland
salinity
Mugil cephalus (Teleostei)
1999
04
01
85
101
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
1999
3
2
HISTOLOGICAL CHARACTERS OF OVARIAN CHANGES OF GERRES OYENA DURING THE REPRODUCTIVE CYCLE IN SUEZ BAY, EGYPT
EL-Boray
F.
EL-Gharabawy
M.
The histology of the ovaries of Gerres oyena was examined to give a picture of the reproductive cycle of this species. This shows that; the development of oocytes can be divided into seven stages, chromatin-nucleolus (oogonia), early perinucleolus, late perinucleolus, vacuolization, primary yolk, secondary yolk and ripe stages. Alsothe maturation of the ovary is divided into eight stages, immature, developing, maturing, mature, ripe, spawning, spent and developing recovery stages. In this species the spawning season was found to be long and extending from June to early September. The spawning habit of Gerres oyena was found to be fractional spawning.
Histology Ovaries-Gerres oyena Gerreidae
Suez Bay
1999
04
01
115
129
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
1999
3
2
EVALUATION STUDIES FOR JUVENILES OF SOME TILAPIA HYBRIDS REARED ON DIFFERENT LEVELS OF PROTEIN AND SALINITIES
EI-Sayed
EI-Ebiaiy
Mohamed
Zaki
ybridization between four important fishes of titapia Oreochromis niloticus; 0. aureus; Taiwan red tilapia and Florida red tilapia were done to compare growth performance, survival rate and feed conversion ratio for F1 hybrids under two levels of water salinity (1.75 and I 5.0 g/L) and protein levels (30 and 40%) in the artificial diet. The present study demonstrates that 1) The hybrids of: O. niloticus males X Florida red tilapia females.O. aureus males X O. niloticus females. O. aureus males X Florida red tilapia female.Taiwan red tilapia males X O. niloticus females. Taiwan red tilapia males X Florida red tilapia females. were judged to be of high potential commercial value, because these hybrids showed increased growth rate and survival percentage and also used less feed to produce one unit of gain in body weight compared with their parents.2) after successful adaptation, the juvenile of tilapia hybrids (O. niloticus) males with other three species females) gave better
tilapia
Hybridization
salinity
crude prolein
performance
feed utilization
survival rate
1999
04
01
149
163
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
1999
3
2
EFFECT OF DIFFERENT DIETARY LEVELS OF LIPID ON GONAD MATURATION IN FLORIDA RED TILAPIA "OREOCHROMIS SPECIES (FAMILY: CICHLIDAE) REARED UNDER DIFFERENT SALINITIES.
Mobarram
G.
El-Ebiary
H.
Zaki
A.
Results obtained revealed that Florida Red Tilapia attains the ripe stage of maturity at all lipid concentrations in the three different salinities with best contributions at 6 % lipid level for both sexes. The hepato-somatic index increased with increasing salinity for females and males. Results also revealed that females cultured in brackish water (17.8%o) attain the maximum hepatosomatic-index (4.24) at 12% lipid level, while for males the maximum index (3.81) is observed at 9% dietary lipid in seawater (36.2%o). The gonado-somatic index is higher for both sexes reaches the maximum valuesat all lipid cnocentrations in the brackish water. Results also, showed that optimum condition factor for females (1.32) is found in fresh water at 3% lipid level, while for males tile maxinium one (1.32) is observed at 3% energy level in brackish water. The average condition factors for females and males (1.7 & 1.6 respectively) in seawater are higher than that in fresh and brackish water. Results indicated that in the three different salinities, the sex ratio reachesmaximum values at 3% energy levels. Also, it is found that in fresh water the sex ratio is significant at (P<O05) 176 Moharram S.G, EI-Ebiary E.H & Zaki M.A with 9% lipid concentration, while in brackish water this ratio is significant at (P<0.25) with 3% energy level. Diet containing 6% lipid concentration is the optimum one for bothsexes Therefore, it is recommended to culture this species in the brackish water at 6 % dietary level of lipid.
Florida Red Tilapia
Gonad maturation
Lipid
salinity
1999
04
01
175
169