2024-03-29T16:27:33Z
https://ejabf.journals.ekb.eg/?_action=export&rf=summon&issue=373
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2002
6
2
EFFECTS OF 17 a-METHYLTESTOSTERONE ON GROWTH PERFORMANCE AND SOME PHYSIOLOGICAL CHANGES OF NILE TILAPIA, OREOCHROMIS NILOTICUS L.) FINGERLLNGS
Mohammad
Ahmad
Mohsen
Abdel-Tawwab
Adel
Shalaby
Yassir
Khattab
_^ifferent doses of 17 a-methyltestosterone hormone (MT) used as I) growth promoter was administrated to Nile tilapia; Oreochromis niloticus in fishmeal based pelleted diet for 90 days. The obtained results showed that low doses of 0.5, L0 and 2.5 mg MT/kg feed were not effective meanwhile the dose of 5.0 mg/kg was the optimum effective one in promoting significant final weight, weight gain and SGR of Nile tilapia. HSI was insignificantly changed at low MT doses, and slightly increased at high MT doses. Male and female GSI was significantly decreased at high MT doses (10, 20 and 40 mg/kg), while insignificant changes were observed at low doses. Feed intake and FCR were slightly changed at different doses of MT. The higher PER was obtained with moderate MT doses and the least ones were obtained with 20, 40 mg/kg or control. The changes in erythrocyte counts, haemoglobin content, haematecrit value and plasma glucose showed insignificant differences at all treatments. A significant reduction of plasma total protein was observed in fish fed 40 mg MT/kg, whereas it was insignificantly changed with other treatments. in contrast, the highest level in plasma total lipids was obtained at 40 mg MT/kg. In fish plasma, the activity of ALT was the highest with control fish and that fed low doses of 0.5-2.5 mg MT/kg, while the least one was obtained with 40 mg/kg. In contrast, AST activity was significantly increased with high MT doses of 20 and 40 mg/kg, while there were no significant changes among other treatments. The higher activity of alkaline phosphatase (ALP) was obtained at low MT doses (0 to 2.5 mg/kg), after which ALP activities decreased to reach the lowest one at 40 mg/kg. Hepatic ALT and AST activities were increased with increasing MT doses where the maximum ALT and AST activities were obtained at 40 mg/kg, while the minimum ones were obtained at MT doses of 0 to 5 mg/kg. In fish muscle, the activity of ALT and AST showed significant reduction with increasing MT doses where the minimum one was obtained with 40 mg/kg. On the other hand, AST activity was insignificantly changed at all treatments.
methyltestosterone
Hormone
Nile tilapia
Growth
physiological changes
liver function
AST
ALT
ALP
glucose
Total protein
total lipids
plasma
Liver
muscle
2002
04
01
1
23
https://ejabf.journals.ekb.eg/article_1736_26204bb4b0cf682d0f9b1bf4ebd16ca3.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2002
6
2
EFFECTS OF DIETARY CARBOHYRATE-TO-LIPID RATIOS ON GROWTH PERFORMANCE AND BODY COMPOSITION OF NILE TILAPIA, OREOCHROMIS NILOTICUSL.FINGERLINGS.
Magdy
Gaber
Six isoniirogenous (31% crude protein), isocaloric (3.7 kcal g-1 ME), practical diets with variable levels of carbohydrates (starch) and lipids (soybean oil) were formulated to determine the ability of Oreochromis niloticus fmgerlings to utilize each nutrients as an energy source. The diets were fed to triplicate groups of fish at a daily rate of 5% of body weight for 16 weeks. There were significant differences in the growth and feed conversion of Nile tilapia fed diets with carbohydrate-to-lipid (CHO : L) ratios ranging from 4.8 to 1.22. A diet containing CHO : L ratio of 4.8 :1 showed significantly lower performance, persumably due to low fat content in the diet. These results indicate that Nile tilapia can efficiently utilize carbohydrate and lipids as an energy source. They can be substituted for one another at a rate of 2.89:1, commensurate with the CHO:L physiological fuel values.
Dietary ration
Growth
body composition
Nile tilapia fmgerlings
2002
04
01
25
40
https://ejabf.journals.ekb.eg/article_1737_8c7dfd1b65823338c921c3bba581b2c1.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2002
6
2
ENDOPARASITIC HELMINTHES OF THE STRIPED MULLET, MUGIL CEPHALUS, FROM THE NORTHERN RED SEA: EFFECT OF THE HOST'S MODE OF LIFE ON THE INCIDENCE AND INTENSITY OF INFECTION
Reda
Hassanine
Ashraf
Ahmed
Arandom sample of 267 individuals of the mullet Mugil cephalus, was collected from the coasts of Sharm El-Sheikh, Northern Red Sea, Egypt. Examination revealed that 108 individuals with a general incidence of 40.44% were parasitized; of this number 63 (23.59%) were parasitized by Leciihoboirys sprenti (Trematoda: Digenea; Haploporidae), 54 (20.22%) by Carassoirema hengalense (Trematoda: Digenea: Haploporidae), 35(13.10%) by plerocercoid larvae (Cestoda: Tetraphyllidea), and 34 (12,73%) by Heterosentis overstreeti (Acanthocephala; Arhythmacanthidae), These parasites are recorded, redescribed and figured for the first time from numerous specimens from the Red Sea to give broadened descriptions. However, the female acanthocephalan H. overstreeti is hereby described for the first time. The examined sample of M cephalus were separated into three regular size groups. In each group, the incidence and intensity of each parasite were discussed. It was concluded that the incidence and intensity of parasites in marine fishes depend to a great extent on the host's mode of life.
2002
04
01
41
58
https://ejabf.journals.ekb.eg/article_1739_18a228ab02bc63f8b98e98d98f4f659f.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2002
6
2
IMPORTANCE OF PROTOZOA AS FOOD TO ZOOPLANKTON AND SOME FISH SPECIES IN LAKE QAROUN, EGYPT
Ade
Mageed
Amaal
Mohammadein
Mahmoud
Desouky
The relationship between the protozoan organisms and zooplankton in addition to fish predation of Lake Qaroun were herby studied. An experiment was conducted in the aquatic laboratory of Shakshouk Station-Fayoum close to Lake Qaroun using cylindrical fiberglass enclosures of 1000 liters capacity that were filled with water pumped from 0.5m depth of Lake Qaroun. The numbers and net population growth and production of the dominant protozoan organisms in absence and presence of small and large- sized zooplankton as well as two native fishes namely, Mitgil cephalus and Tilapia zillii were described. The average air and water temperatures were 27.7±2.1 and 22.6±l.lsC (mean ±SD) respectively. PH values ranged from 7.39 to 8.00 (7.74±0.13, mean±SD) while ammonium ranged from 64.39^gf 1 to 1.05mgmrl during the experiment At the start, the protozoan organisms, constituted numerically 48.12% of total zooplankton organisms that dominated by three species; Tintinnopsis kofoidi, Helicostomella subulata, and Euplots vannus. In the presence of the small-sized organisms (SS), the total protozoan number was decreased. In the presence of small and large sized organisms (SLS) the protozoan number returned to the control level The impact of the fishes was more pronounce in presence of M. cephalus than T. zilli compared to the control enclosure. Protozoan organisms were observed in the gut contents of M cephalus and T. zilli, representing 1429% and 4.69% respectively. The net population growth (NPG) was higher in control. (1.18 day ), while its lowest level was recorded in presence of M cephalus (0.63 day"1;.(2.15 day"') followed by SLS (2.10 day1). NPGR of T. kofoidi was the highest especially in presence of the SLS
2002
04
01
59
74
https://ejabf.journals.ekb.eg/article_1740_d160158e24c258340f44a72e2aaa2592.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2002
6
2
PHYTOPLANKTON VARIABILITY IN THE EASTERN HARBOUR ALEXANDRIA (EGYPT)
Wagdy
Labib
The present study was conducted during August 1997-August 99 to investigate the Eastern Harbour (eutrophic marine basin) environments and the corresponding phytoplankton communi ty structure, species composition and blooming of different causative organisms that are known to be inherently continuously variable. Anthropogenic eutrophication and geographical dispersion from neighbouring areas into the harbour strongly influenced such variability, and hinder any particular seasonal trends. Yet, the pronounced late winter-spring increasing population and other blooming pulses in summer and autumn caused by less than a dozen species (mainly of diatoms, eutrophication symptom) were predominant characteristics of the production cycle in the harbour, Discharge water into the harbour created rich spectra for algal growth, not necessarily for its nutrient content, but ultimately for the stabilisation of the water column, salinity fluctuation was a crucial factor limiting the phytoplankton variability. Pyramimonas and Micromonas species culminated at maximum abundance in spring with the initiation of thermo-haline stratification of the water column, and it also seems sensitive to the inter-annual variations in temperature. Dinoflagellates predominated at intermittent periods in summer well stabilized the water column, with low nitrate, and relatively high phosphate concentrations. The species-specific patterns include aspects as; the cyclic abundance of the centric diatom Skeletonema costatum', the episodic blooms of mdegenous species that normally do not show blooming in the harbour {Cyclotella narta, Leptocylindrus minimus and Lithodesmfum unduhtum); the reappearance of endogenous dinoflagellate species that were not so far recorded during the last decades (Gyrnnodinum sanguineum and Gonyaulax spinifera); and the seasonal shift in predominance and trends (increasing-decreasing abundance and disappearance) of the major dinoflagellate species {Prorocenirum iriestinum, Gymnodinium caienatum and Scrippsiella trochoidea).
missed
2002
04
01
75
102
https://ejabf.journals.ekb.eg/article_1741_84e182cf224a529b4886743cb04d6a95.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2002
6
2
HISTOPATHOLOGICAL, HISTOCHEMICAL AND PHYSIOLOGICAL STUDIES ON THE EFFECT OF THE INSECTICIDE "HOSTATHION" ON THE LIVER OF THE CATFISH CLARIAS gariepinus
Saber
Sakr
Soad
Hanafy
Nabila
El-Dosouky
In the present work experiments were carried out to investigate the hazardous effects of the organophosphorous insecticide (Hostathion) on the histology, histochemistry and physiology of the liver of the catfish (Clarias gariepinus) after exposure to LC50, VzLCso and ViLCso of the insecticide for different periods. The results showed that the histopathological changes induced in the liver were mainly represented by liver cord disarray, cytoplasmic vacuolization of the hepatocytes, damage of blood sinusoids, blood vessel congestion and inflammatory leucocytic infiltration. The histochemical observation revealed marked reduction in glycogen contents and total protein contents of the liver cells as compared with the control materiaL Physiologically, different treatments at different time intervals resulted in variable degrees of inhibition in 5'-nucleotidase and alkaline phosphatase activities. These changes were both concentration- and time- dependent.
2002
04
01
103
123
https://ejabf.journals.ekb.eg/article_1742_ae9932f4959234de186a821362ddaafd.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2002
6
2
EFFECT OF CADMIUM AS A WATER POLLUTANT ON THE FILTRATION RATE AND THE HISTOLOGY OF THE SIPHON OF THE MARINE CLAM VENERUPIS A UREA
Atnaal
Mohamadein
Mahmoud
Desouky
Cadmium is one of the most harmful environmental pollutants and has major toxicological effects on marine organisms. The present investigation was performed to study the effect of sublethal concentrations of cadmium on the filtration rate and siphon histology of the clam, Venerupis aurea. All applied concentrations of cadmium were found to inhibit the filtration rate of the investigated species. Histopathological studies revealed also that exposure to 300 ppb of cadmium induced severe effects on the siphonal wall of the clam, which ultimately reduce the filtration rate. Firstly, it reduces the efficiency of the straining tentacles in preventing the entrance of large particles into the mantle cavity; secondly, it leads to contraction and shortening of the siphon that resulted in shortening of gill axis and reduction of interfilamentar space. This will reduce the power and capacity of the filter pump. Other histopathological effects of cadmium on the siphon were increased mucous secretion and constriction of the lumen that may affect the flow of water into mantle cavity. Moreover, it leads to necrosis of the outer and inner epithelia, derangement of muscle fibers and enlargement of blood lacunae.
cadmium
filtration
siphon
histology
clams
Venerupis
2002
04
01
125
139
https://ejabf.journals.ekb.eg/article_1743_c6a84afb1c9fa9655161ad1fab618430.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2002
6
2
STUDIES ON PARTIAL AND COMPLETE REPLACEMENTS OF FISH MEAL WITH GAMBUSIA MEAL IN DIETS FOR THE COMMON CARP "CYPRINUS CARPIO"
Ali
Abdelghany
Atwelve week experiment was conducted to evaluate the suitability of gambusia {Gambusia afflnis) fish meal (GFM) as a partial or complete substitute for the protein supplied by herring fish meal (HFM) in diets for the growth of common carp fingerlings (mean weight of 0.35g/fish). Seven isonitrogenous (35% crude protein), isolipidic (9%) and isocaloric {3.7 kcal DE/g) diets were formulated in which GFM replaced 0.0%, 10%, 25% 50%, 75%, 90% and 100% of the protein supplied by HFM. Results demonstrated that GFM has good potential as a substitute for up to 50% of the protein supplied by HFM in common carp diets with no significant (P < 0.05) adverse effects on growth, feed efficiency, body composition and apparent digestibility of dry matter, protein and gross energy compared to fish fed the HFM-based diet (control diet). Survival rates in fish fed all the experimental diets were high and were statistically comparable to that offish fed the control diet and ranged from 93.3% to 95.6%. The percentages of apparent protein digestibility showed variation between diets, ranging from 81.1 to 86.6 with no significant differences among treatment means compared to the control diet. At the end of the study, substituting HFM-protein with GFM-protein in diets for common carp resulted in insignificant differences in final body composition of protein and ash, whereas dry matter and fat were significantly reduced (F > 0.05) compared to fish fed the control diet. Hematological characteristics of common carp were examined at the end of the study and the results showed that values of hemoglobin, RBC, hematocrit and serum protein in fish groups of all the treatments were statistically equal or even better than those offish fed the control diet. An economic analysis suggested the possibility of using GFM as an alternative source of protein in common carp feed, Diets containing 50% of the protein from HFM and 50% from GFM provided the best economic efficiency offish weight gain among all other test diets.
Fish meal replacement
Common Carp
Gambusia
alternative protein source
2002
04
01
141
165
https://ejabf.journals.ekb.eg/article_1744_56738ebada12a76dcf5c293205c11987.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2002
6
2
SUBLETHAL EFFECTS OF COPPER SULFATE, MALATHION AND PARAQUAT ON PROTEIN PATTERN OF OREOCHROMIS NILOTICUS
Khalid
Sharaf-Eldeen
Nassr-Allah
Abdel-Hamid
The present study deals with the effect of some water pollutants; copper sulfare as a fungicide, malathion as an insecticide and paraquat as a herbicide, on ;:'_rum total protein serum albumin and globulin. Furthermore, protrrinogram of blood serum niloticus in Oreochromis was done using electrophoresis. It was found that the control fish have nine serum protein fractions. The exposure offish to the examined pollutants induced a disappearance of some fractions and consequently changes of relative mobility and area that indicate genetic damage.
Electrophoresis
Serum protein
copper
malathion
paraquat
Oreochromis niloticus
2002
04
01
167
182
https://ejabf.journals.ekb.eg/article_1745_84b3fbaf8642487be5aa2d3751693a8a.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2002
6
2
RELATIONSHIP BETWEEN PHYTOPLANKTON, ZOOPLANKTON AND FISH CULTURE IN A FRESHWATER FISH FARM
Adel
M ageed
Add
Konsowa
This study was carried out at the Barrage Fish Farm during 2001 farming season. It was performed to evaluate the plankton communities and the effect of fishponds on their standing crop and species composition.The data revealed that the phytoplankton communities are represented by five classes namely Chlorophyceae,BaciHariophyceae, Cyanophyceae, Dinophyceae and Euglenophyceae. Their major peak was observed at Pond 6 while the minor one was found at Pond 5. With regard to the monthly variations, phytoplankton communities flourished in July while their minimum occurrence occurred in September and August. The zooplankton species belonged to rotifers, cladocerans, and copepods in addition to the meroplanktonic forms. Rotifers were most common in all ponds. It constituted 94.64% of total zooplankton in the ponds. Copepoda occupied the second predominant position and contributed 4.23% of total zooplankton crop. Cladocera was dominated by Moina micrura. The average zooplankton number at the ponds was 258.4 orgT , their major peak of 1073 org.l"1 was observed at Pond 3 in April, while the minor one of 20 org.1"1 occurred at Pond 5.Fish culture had obviously influenced the intraplanktonic dynamics, Chlorophyceae occupied the first predominant position at the fishponds and constituted about 60% of the total crop followed by Bacillariophyceae (25.8%) and Cyanophyceae (14%). Diatoms replaced green algal position at the River Nile water and contributed about 70% of the total numerical density. The small rotifers and nauplius larvae of copepods were the most dominant in fishponds in spite of the large forms in the main feeder.
Fish culture
Oreochromis niloticus
fertilization
physico-chemical parameters
phytoplankton
Zooplankton
trace metals
fish predation
2002
04
01
183
206
https://ejabf.journals.ekb.eg/article_1746_84f167226d0ee3b30d88ca4f04fab81f.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2002
6
2
تأثير هرمون الميثيل تستوستيرون علي أداء النمو وبعض التيرات الفسيولوجيه في أصبعيات البلطي النيلي {Oreochromis nihticus)
2002
04
01
1
10
https://ejabf.journals.ekb.eg/article_1747_c7b38405cd138d24c96e60e447f128c3.pdf