2024-03-29T11:24:54Z
https://ejabf.journals.ekb.eg/?_action=export&rf=summon&issue=411
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2007
11
2
EFFECT OF MIXED PROTEIN SCHEDULES ON NILE TILAPIA {ORE0CHROMIS NILOTICUS) PERFORMANCE IN COMBINATION WITH SOME FEED ADDITIVES I-MIXED PROTEIN SCHEDULES AND SODIUM CHLORIDE
Osama
EI-Husseiny
Galal ElDin
Abdul -Aziz
Rania
Mabroke
The experiment was designed in a (4x3) factorial arrangement of treatments to investigate the effect of four different mixed protein schedules and three dietary Na/K ratios on Nile tilapia performance. The four protein schedules were achieved by alternating the diet (A ; 31%CP)and diet (B;24°/oCP)as follows (6-days~AX(5days~A/lday-B), (4days-A /2days-B) and (3days-A /3days-B).Meanwhile, sodium chloride was added to study the effect of Na/K ratio of 0.5 ,1.5 and 2 on utilization of dietary protein, amylase and lipase activity and serum thyroid hormone level. Moreover, the interaction between mixed protein schedules and Na/K ratio has been investigated. The results are summarized as follows:- The optimal protein schedule for tilapia performance was either (5A/lB)or(4A/2B).- Fish in (5A/1B) or(4A/2B) schedules utilized protein more efficiently than fish fed on higher protein diet continuously (6A>.- Addition of NaCl to fish diet to achieve Na/k ratio 2 was beneficial and improved fish performance with decreasing inclusion of higher protein diet in protein schedule (3A/3B)- Increasing Na/K ratio decreased thyroid hormone level in the male and maintained it in contrast with the female- Raising of Na/K up to 2 decreased lipase activity and ether extract digestibility.- The lowest feeing cost was recorded for fish fed on on diets with Na/K ratio 2 and fed on on (4A/2B) schedule.
Nile tilapia
protein
NaCl
Na/K ratio
Feed additives
2007
04
01
1
22
https://ejabf.journals.ekb.eg/article_1930_c185d57468e0ba154fa3b2278d40c90f.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2007
11
2
PRELIMINARY STUDIES ON THE OCCURRENCE OF MYCOTIC AND MYCOTOXIN CONTAMINATION IN AQUACULTURE FEEDS USED IN SAUDI ARABIA
Adnan
Salama
The present study was carried out on three kinds of aqua feed used for feeding of marine fishes and shrimp in Fish Farming Center (FFC h Jeddah, Saudi Arabia namely; Grower seabass, Grower tilapia and Grower shrimp. Random feed samples were collected at regular intervals every two weeks for 4 months from the feed storage room. Total mycotic counts, identification of moulds, concentration of aflatoxin and ochratoxin as well as proximate analyses of feeds were determined aad the correlation between them was estimated. Moreover, the storage conditions were monitored all over the period of experiment. Tbe mycological investigation revealed that the grower shrimp diet was more contaminated than the other two types of feeds, where the total mycotic counts reached to 3.666 x 107 cfii/gm after 4 months, while the total mycotic counts reached to 2.867 x 104 cfu/gm and 8.3 * 105 cfu/gm in grower seabass and grower tilapia diets respectively. Aspergillus species were dominant in all kinds of aquafeeds tested in addition :o Mucoraceace fungi in grower seabass feed. The identified Aspergillus $?. were classified into A. flavus, A. fumigatus, A. ochraceaus* A. niger asd A. terreus. A. jlavus was predominant in all types of feed in addition to A. fumigatus in grower shrimp, while A. ochraceaus was recorded by L 6 and 7 isolates in grower seabass, grower tilapia and grower shrimp feeds respectively. Aflatoxin and Ochratoxin were increased in concentration by increasing the period of storage which reached 1.91 ±0.11 and 2.£9 ±0.16, 79.0 ±4.7 and 24.60 ±3.21, and 98.55 ±5.20, 66.50 ±5.65 ppb ia grower seabass, grower tilapia and grower shrimp respectively. Tbe proximate analysis of the ratios revealed that the nutritive value decreased after 30 days in grower shrimp diet and after 48 days in grower tilapia diet, while the nutritive value of grower seabass diet was not affected during this investigation. It is worthy; to mention that the storage conditions were more than the suitable levels, even the temperature or humidity as well as moisture contents of the diets. So, we concluded that the aquafeeds should be stored in good and define conditions as well as for a specific period to prevent mycotic contamination and if we need to store them for long period, fungal and its metabolites inhibitors "antifitngal and antimycotoxin" should be added.
Aquaculture
Feeds
mycotoxin
Aflatoxin
OchratoxiiL mycotic counts
Proximate analysis
2007
04
01
23
42
https://ejabf.journals.ekb.eg/article_1932_e8bb3342c0915aeb5d0dab9fcf5ba54c.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2007
11
2
THE PRODUCTIVITY OF NILE TILAPIA, OREOCHROMISNILOTICUS (L.) REARED UNDER DIFFERENT BROODSTOCK DENSITIES AND PHOTOPERIODS IN A RECYCLING WATER SYSTEM
Adel
Tharwat
The effect of three brood fish stocking densities (4, 8 and 12 fish / m2) combined with three photoperiods (12, 15 and 18 hours/day) on the fry production of the Nile tilapia, Oreochromis niloticus (L.), were evaluated in a recycling water system. Treatments were arranged according to a 3x3 factorial design with three replicates giving a total of 27 spawning fiberglass tanks. Males and females with mean body weights of 160.3 and 112.0 g, respectively, were stocked at a male: female ratio of 1:3 in all tanks, and the experiment lasted for 120 days. The results showed thai breeders stocked at the lowest stocking density (4 fish / m2) combined with the longest photoperiod (18 hours/day) had significantly higher (P<0.05) mean values for total fiy production, fry / kg female /day, fry / female /day, fry / m2 / day, spawning rate and hatching rate than at 8 and 12 fish/nr broodstock densities exposed to the same photoperiod. Moreover, the productivity parameters of tilapia decreased in descending order with the medium and short photoperiods (15 and 12 hours/day, respectively) for all densities. The maximum percentage of yolk-sac and swim-up fry stages were obtained at the lowest stocking density combined with, the longest photoperiod. These findings are discussed to achieve optimum reproductive performance of Nile tilapia broodstock for fry production management.
Nile tilapia
broodstock density
Photoperiod
fry production
hatching
2007
04
01
43
64
https://ejabf.journals.ekb.eg/article_1933_33ec2b2a3d3cdab0b0cce56ec94efc1d.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2007
11
2
STUDIES ON THE EFFECT OF DRAIN EFFLUENTS ON THE WATER QUALITY OF LAKE MANZALA,EGYPT.
Abdel -Samei
Elewa
Mohamed
Ghallab
Mohamed
Shehata
Ebtisam
Saad
The water quality of Lake Manzala was studied seasonallyJ during the period from autumn 2000 to summer 2001. The results of physical parameters revealed that the values of transparency at the southern region are relatively low and reflect the type of effluents, characterized by high amounts of floating materials, which decrease the water transparency. Moreover, the electrical conductivity at these stations were somewhat high as a result of sewage and industrial wastes at that region. On the other hand, the chemical analysis of water showed high values of chemical oxygen demand (COD) and biological oxygen demand (BOD) but low levels of dissolved oxygen (DO) especially at the southern region opposite to Hadous and Bahr El-Baqar drains, in addition to high levels of trace metals.
water quality
trace metals
agricultural wastes
Lake Manzala
drain effluents
2007
04
01
65
78
https://ejabf.journals.ekb.eg/article_1934_4377bc00efb83edf4a673b925184a0df.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2007
11
2
IMPACT OF CERTAIN HEAVY METALS ON THE GILL AND LIVER OF THE NILE TILAPIA (OREOCHROMIS NILOTICUS)
Hanan
Gaber
The effect of the heavy metals Cu, Zn, Cd and Pb on the gill and liver tissues of the Nile tilapia, Oreochromis niloticus was examined in the laboratory. One hundred and fifty adult fish were divided into five groups (control, copper, zinc, cadmium and lead) each group containing 30 fish. They were continuously exposed to sub- lethal concentration of each metal (lmg/L) for a period of 10 days. From each group, the gills and liver of six fish were removed after 10 days and the remaining fish were transferred to tap water for:a recovery period (21days). The tissue samples of gills and liver of both treated and recovery fish were dissected for histological examination. The results showed that the extent of distortion of the gills and liver was more pronounced in the fish group that were exposed to Cd&Pb.
Heavy metals
toxicity
histopathology
Gill
Liver
Nile tilapia
2007
04
01
79
100
https://ejabf.journals.ekb.eg/article_1936_6f0e6b9de909e53be2fd0345f44055bb.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2007
11
2
EFFECT OF INCORPORATION OF FISH SILAGE INTO DIETS ON GROWTH PERFORMANCE AND BODY COMPOSITION OF NILE TILAPIA (OREOCHROMIS NILOTICUS)
Nabil
Abd El-Hakim
Mahmoud
Et-Gendy
Mahmoud
Salem
The potential value offish silage as a protein source for freshwater fish was assessed by chemical analysis and by incorporation of silage in exprimental diets for Oreochromis niloticus , Fish silage was prepared from a mixture of Nile tiiapia unedible parts,. Sulphuric formic silage was prepared by addition of 1.5% concentrated sulphuric acid and 1.5% concentrated formic acid to the minced mixture of whole Nile tiiapia bodies. The silage was stored for 24 weeks. The chemical composition of fish silage was determined and some of the changes occuring in protein during storage were described. Three diets were formulated in which fish meal was replaced by fish silages (50,75 andl00% silage), Diets were fed to experimental groups of tiiapia for 13 weeks. A significant difference in growth performance and protein productive value were noted between tiiapia fed on 100% fish silage and other treatements; however feed convertion ratio and protein efficiency ratio showed no significant differences between all treatments. The carcass composition parameters were affected by silage in diets. Cost benefit analysis showed that low profit index and high inclusive cost were obtained by the control diet.
Nile tiiapia
fish silage
performance
Growth
2007
04
01
101
117
https://ejabf.journals.ekb.eg/article_1937_e5a1a81862b8c37a937371cad182abae.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2007
11
2
THE BIOLOGICAL LOAD OF SILVER CARP CAGES IN THE RIVER NILE AND THEIR EFFECTS ON WATER QUALITY AND GROWTH PERFORMANCE
Ibrahim
Shaker
Ahmed
Mahmoud
Silver carp fmgerlings were stocked in cages at three different densities. Four replicates cages 6x9x4m were cultured for 150 days during two seasons from February to December 2004. These stocking densities of silver carp (initial weight 5-10g) were tested in three locations; El-Mahmoudia (8, 10 and 12 fish/m); Fazara (6, 8 and 10 fish/m3) and Edfina (4, 6 and 8 fish/m3) in cages suspended in the River Nile at each location in two seasons. The impacts of cages on water quality were investigated. Results obtained are summarized as follows:1- Water temperature ranged from 26.5 to 27.4°C in all cages at all locations.2- Values of pH, DO, NH4, NH3, N02, TP, OP and chlorophyll a increased significantly down stream after passing the cages.3- SD decreased sharply after the site of cages at all locations.4- Survival rate was affected by location5- Location released affects on cage production.The maximum production rate achieved was 19.87 kg/m3 in first season with initial weight of lOg fish/m3 at EI-Mahmoudia. The results of this study suggest that cages in the River Nile and stocking density are more than load on water.We can suggest that necessary codification the use of water in the River Nile in cages culture, also, transferring these cages in lakes.
cages
intensive
River Nile
Growth performance
water quality
biological load
Silver carp
2007
04
01
119
143
https://ejabf.journals.ekb.eg/article_1938_57d26c73856fd7ac297f51c83d3d290a.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2007
11
2
TOXICOLOGICAL EFFECT OF BUTATAF HERBICIDE ON SOME PHYSIOLOGICAL ASPECTS AND THE REPRODUCTIVE PERFORMANCE OF NILE TBLAPIA OREOCHROMIS NILOTICUS
Adel
Shalaby
Mamdouh
Mousa
Hanan
Tag, El-Dian
This study was carried out to assess the effects of butataf herbicide on the physiological state and reproductive endocrine function of Nile tilapia " Oreochromis niloticus". The 96 hour half lethal concentration (96 hr LC50) of the butataf herbicide (N-Butoxymethyl-2-chloro-256-diethylacetanilide) determined for the adult Oreochromis niloticus was 0.2 ppm. The field concentration of this herbicide was 0.004 ppm which equals to the V50 of the 96 hr LC50. The present experimental assay was evaluated on the 30lh day of exposure to the VJOO LC50; V50 LC50; V25 LC50 and lAo LC50 in comparison with control group. During determination of the 96-hr LC50, the fish exhibited erratic swimming movements. The mucus secretion was increased and accumulated on the gills, so the fish exhibited a respiratory disorder with surfaced swimming, opening their mouth with rapid and frequent exhalation.The red blood corpuscles (RBCs), haemoglobin (Hb) and haematocrit (Ht) were decreased significantly in fish groups exposed to butataf herbicide compared to the control one. The plasma aspartaie amino transferase (AST) and alanine amino transferase (ALT) enzymes activities were also decreased significantly in fish exposed to the herbicide. On the other hand, the uric acid and creatinine recorded high levels in fish groups exposed to the high concentrations of the herbicide, also, glucose and total plasma lipids were increased significantly in all treated groups. Meanwhile the total plasma protein was strongly decreased and the effects were dose-dependent, as well as the fecundity, gonado-somatic index and hepato-somatic index. Estradiol and testosterone hormones showed severe changes in females and males specially those exposed to the high concentrations of butataf herbicide. Also, T3 and T4 recorded the same trend.
Nile tilapla
butataf herbicide
Haematology
biochemistry
fecundity
Steroid hormones
2007
04
01
145
163
https://ejabf.journals.ekb.eg/article_1941_80ebb109a3e26eda62c04ec53ab452ef.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2007
11
2
DIETARY IRON REQUIREMENT OF THE NILE TILAPIA, OREOCHROMIS NILOTICUS (L.) FINGERLINGS IN INTENSIVE FISH CULTURE
Sabry
El-Serafy
Magda
El-Ezabi
Talaat
Shehata
Neven
Esmael
The objective of the present study was to determine the dietary iron requirement for the Nile tilapia, Oreochromis niloticus fmgerlings in intensive fish culture system. O. niloticus fmgerlings (25.36±0.11g) were stocked in fiberglass tanks (lm3) under water running system at a density of 40 fish/m3 with a feeding level of 3% of body weight. Six purified diets containing different iron levels (0, 200, 400, 800, 1200 &1600 mg Fe/ Kg) in a form of ferrous sulphate were tested on the Nile tilapia for 8 weeks. Results revealed that FBW and SGR were the highest (P<0,05) in the fish group fed on the diet supplemented with 1200mg Fe /Kg and the lowest were recorded in fish fed on the iron free diet. Each of K and FI were insignificantly affected by dietary iron levels. The lowest value of FCR was recorded for fish fed on 1200mg Fe/ Kg diet. The results of the present study revealed that, the group offish fed 1200-mg Fe /Kg diet had significantly(P<0.05) the highest value of average daily gain in weight PPV and ER. Red blood cell count, haemoglobin and haematocrit values were increased with increasing the level of iron and significantly affected by dietary iron levels. The highest value of MCH was recorded for fish fed 1200 mg Fe /Kg diet. The lowest values of RBCs, Hb, ,Hcts MCVr MCH and MCHC were recorded for fish fed on iron free diet. TotaL plasma proteins and plasma glucose values were not significantly affected by increasing dietary iron level, while plasma cholesterol increased significantly by increasing the level of iron in the diet. The results of the present study suggest that iron supplemented to the diet up to a level of 1200mg Fe/ Kg diet from ferrous sulphate improves the growth performance and haematological parameters of O. niloticus fingerlings.
Nile tilapia
Oreochromis niloticus
Fish culture
iron
haemoglobin
diet
2007
04
01
165
184
https://ejabf.journals.ekb.eg/article_1942_5bf64da185cc3caef46a9ebc371cc0c3.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2007
11
2
THE POTENTIAL IMPACT OF LAKE MANZALA ON THE PHYTOPLANKTON AND HYDROGRAPHIC CHARACTERS OF THE SUEZ CANAL, EGYPT
Fedekar
Madkour
This study comes to elucidate the potential impact of Lake Manzala on the hydrobiological characters of Suez Canal. Physico-chemical parameters and phytoplankton composition and abundance were studied seasonally during summer 2002 and spring 2003 in Lake Manzala, Suez Canal and El-Qabouty canal. Lake Manzala showed extremely turbid water, low salinity (average: 12 %o), high nutrient and chlorophyll contents (averages: 1.2, 4.4, 2.4, 101 |iM/l and 99.7 jig/1 for nitrite, nitrate, phosphate, silicate and chlorophyll, respectively). It attained low-species diversity and abnormally heavy phytoplankton blooms, in addition to the dominance of Chlorophyta, and Cyanophyta, Converselyr the Suez Canal was more transparent with higher salinity (average: 27.5 %o) and lower nutrient and chlorophyll concentrations (averages: 0.5, 2.3. 0.7, 22.4 nM/1 and 7.7 jig/1 for nitrite, nitrate, phosphate, silicate and chlorophyll, respectively). The number of species in the Suez Canal was much higher with the predominance of marine species, in addition to the occurrence of some blooms from freshwater and brackish water species. From the present study, it can be concluded that the two ecosystems (Lake Manzala and Suez Canal) showed both structural and dynamical differences, as evidenced by their different hydrological characters, species composition and standing crop of phytoplankton population-Although the presence of such difference, the pronounced effect of Lake Manzala water on the northern part of the Suez Canal waters was clear!y obvious.
Lake Manzala
phytoplankton
Suez Canal
Hydrobiology
2007
04
01
185
204
https://ejabf.journals.ekb.eg/article_1944_8172fee156aae3c1fa64bc6ba6ee00df.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2007
11
2
تأثيرالنظم البروتينيه المختلطه علي الأداء الإنتاجي لأسماک البلطي النيلي في وجود بعض الإضافات الغذائيه : 1-تأثير النظم البروتينيه المختلطه وکلوريد الصوديوم
2007
04
01
1
11
https://ejabf.journals.ekb.eg/article_1945_9188836cc8f7cb056e4f5d0dc57a5ee9.pdf