2024-03-29T13:52:57Z
https://ejabf.journals.ekb.eg/?_action=export&rf=summon&issue=445
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2013
17
4
Age, growth and mortality of the cichlid fish Oreochromis niloticus (L.) from the River Nile at Beni Suef Governorate, Egypt
Adel
Hassan
Midhat
El-Kasheif
Monthly samples of Oreochromis niloticus from the River Nile at Beni Suef were collected during the period from January 2009 to December 2010. The Von Bertalanffy growth function parameters were: 𝐋∞ = 48.14 cm, K = 0.147 𝐲𝐫−𝟏, and 𝐭𝟎 = 0.2237 year. The total mortality coefficient (Z) was calculated as 0.9654 𝐲𝐫−𝟏, the natural computed mortality coefficient (M) was 0.4010 𝒚𝒓−𝟏 with fishing mortality (F) estimated as 0.5643 𝐲𝐫−𝟏 and exploitation ratio (E) calculated as 0.5819. This high exploitation ratio shows that the stock of Oreochromis niloticus from the River Nile at Beni Suef is overexploited.
Cichlid
Oreochromis niloticus
Egypt
Fisheries
mortality
2013
12
01
1
12
https://ejabf.journals.ekb.eg/article_2181_8205effdf029dcbed460931707f7e423.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2013
17
4
Effect of rearing temperature and hormone treatment on sex ratio, survival and body weight of Oreochromis niloticus fry
Magdy
Soltan
Mohamed
Hassaan
Gamal
El-Nagaar
Wahead
Mohammed
Abdelhamid
Abdelhamid1
Manal
El-Barbary
El-Deweny
Mabrouk
The present experiment was carried out to investigate the effect of rearing water temperature in combination with or without hormone application on masculinization of newly hatched O. niloticus fry. Nile tilapia fry (0.025 g) were reared in three levels of temperature 25, 30 and 35°C and in each rearing temperature fry were fed diet with or without supplementation of 60 mg 17α-methyltestosterone (MT) for 7, 14, 21 and 28 days.O. niloticus fry fed diet without MT and reared at different water temperature 25, 30 and 35°C significantly increased the male ratio from 48.67 to 48.67 and 65.33% after one week; 48.67 to 64.00 and 72.67% after two weeks; 48.67 to 68.67and 77.33% after three weeks and 48.67 to 80.67 and 84.00% after four weeks,respectively. While fry fed diet supplemented with MT with increasing rearing water temperature from 25 to 30 or 35 °C significantly increased male percentage from 58.00 to 84.67 and 86.00% after one week; 67.66 to 93.33 and 96.67% after twoweeks; 79.00 to 97.33 and 98.67% after three weeks and 85.67 to 98.00 and 99.33% after four weeks.Mortality rate for O. niloticus fry reared at different water temperature 25, 30 and fed diet without MT significantly increased from 10.33 to 14.00 and 14.33% after one week; 10.33 to15.33 and 15.00% after two weeks; 10.33 to 15.33 and 1517% after three weeks and 10.33 to 15.83 and 16.83% after four weeks. But, supplementation ofO. niloticus feed diet supplemented with MT and increasing rearing water temperature from to 30 or 35°C significantly increased mortality rate from 14.67 and 14.00% after one week; 16.00 and 15.67% after two weeks; 15.33 and 15.67% after three weeks and 16.00 and 17.33% after four weeks of treatment.The highest fry body weight was recorded for fry group administrated with MTand reared at water temperature of 35°C and the opposite trend was observed with fry group reared at the lower temperature (25°C) and fed diet without MT.
Temperature
hormone treatment
sex ratio
Oreochromis niloticus
2013
12
01
13
23
https://ejabf.journals.ekb.eg/article_2182_e594aa0425a7c97297d96ade951b5703.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2013
17
4
Effect of oxytetracycline and florfenicol drugs on the physiological activities and its residues of Oreochromis niloticus
Magdy
Soltan
Hossam
Agouz
Mona
Mohamed
The present study was carried out to study the effect of different doses (40, 80,120mg/kg basal) diet of oxytetracycline, (OTC) and florfenicol, FF (7.5, 15,22.5mg/kg basal diet) on growth performance, feed utilization, physiological activitiesand residues of Oreochromis niloticus (7±0.66g).Fish fed the diet supplemented by 40mg OTC/kg basal diet showed the highest finalbody weight (BW), weight gain (WG), condition factor (K), specific growth rate (SGR),protein efficiency ratio (PER) and the best FCR, while the lowest final BW, WG, Kvalues were achieved by fish fed the diet 120mg oxytetracycline/kg diet. Fish fed the dietsupplemented by 22.5mg FF/kg diet showed the highest final BW, BL, K, feed intake (FI)and the lowest final BW, BL, WG and K values were fed the diet 7.5mg FF/kg dietcompared with control group and other doses of FF, for fishes.Liver transaminase enzymes, Alanine aminotransferase (ALT) and aspartateaminotransferase (AST) increased with increasing the doses OTC and FF. the fish fedthe diet supplemented by 40mg OTC/kg recorded the highest value of ALT, AST andinsignificant decrease in total protein (TP) and the fish fed the diet supplemented by15mg FF/kg basal diet recorded the highest value in the ALT, AST and TP comparedwith control group and the other doses of FF.The fish fed the diet 120mg OTC/kg diet recorded the highest value in thehaemoglobin (Hb), white blood cells (WBCs) and significant increase in red bloodcells (RBCs) while the fish fed the diet supplemented by 40mg OTC/kg basal dietrecorded the lowest value of Hb, WBCs and RBCs compared with other OTC doseswith insignificant increase in Hb, RBCs compared with control group.Fish fed the diet supplemented by 7.5mg FF/kg diet recorded the highest valueof Hb, RBCs and insignificant decrease in WBCs but the fish fed the diet 22.5mgFF/kg diet recorded the lowest value in Hb, WBCs and RBCs compared with controlgroup and the other FF doses.Residues of OTC and FF in fish tissues showed that all the doses ofoxytetracycline and florfenicol after 21 days have no risidue in tissues while at theexperimental end all samples were positive and the dose 40mg OTC/kg diet and thedose 7.5mg FF/kg diet caused the lowest values in fish tissues compared with otherdoses.
Fishes
RBCs
WBCs
Hb
Oxytetracycline
florfenicol
2013
12
01
25
36
https://ejabf.journals.ekb.eg/article_2183_db08e7a4f5af45c2a86cef889e74aad4.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2013
17
4
Reproductive biology of European hake Merlucciusmerluccius (Linnaeus, 1758) in the Egyptian Mediterranean waters
Amal
Philips
Evelyn
Ragheb
The reproductive biology of the European hake (Merlucciusmerluccius,Linnaeus, 1758) was studied in the Egyptian Mediterranean waters from December 2009 to November 2011. The sex ratio revealed that males dominated the catch ingroups from 13.0 to 32.0 cm, while females dominated for larger groups (33.0- 47.0 cm). Generally, males dominated the catch in all seasons. Length at first sexual maturity was found to be 21.8 cm and 24.0 cm for males and females respectively. For both sexes gonadosomatic index reached maximum values during February and March, and the spawning season extended from April to June. Hepatosomatic index showed higher values during April and May. Ova diameter ranged from 0.28 mm to 0.84 mm. The average fecundity ranged from 40706 to 420950 eggs for the size range25.0-53.0 cm. Absolute fecundity increased proportionally with fish length and weight.
Merlucciusmerluccius
Reproductive biology
Mediterranean waters
2013
12
01
37
47
https://ejabf.journals.ekb.eg/article_2184_e0e374082f2c132c4d2c8d55b094f4a2.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2013
17
4
Nutritional studies on brewer dried grains as an alternative protein source for Nile tilapia (Oreochromis niloticus) diets
Mohssen
Hessein
Al-Desok
Al-Azab
Abd El-Wahab
El-Warith
Mohammed
Bolbol
Medhat
Seden
Brewer dried grain (BDG) was tested to replace soybean meal in diets of monosex Nile tilapia (Oreochromis niloticus). Five isonitrogenous (30%), isocaloric (442kcal/100g) diets were formulated to contain BDG as an alternative protein sourceinstead of soybean meal at different levels (0, 25, 50, 75 and 100%). A total numberof 225 of Nile tilapia (0.45g)were randomly distributed into five experimental groups,each in trireplecates, and were fed daily at a rate of 15% decreased gradually to be 4%of fish live weight through 14weeks experimental period.Data collected were ongrowth performance, feed utilization and body composition in addition to economicevaluation. Results of growth performance did not show any adverse effects related tothe incorporation of BDG up to 75%. FI shows the exact similar trend of growthperformance. The incorporation of BDG in the diets improved slightly FCR, FER andPPV. Fish whole body composition of treatments groups which showed higher DM,EE, energy and somewhat protein contents and lower moisture and ash than thatrecorded at the start of the experiment.
Nile tilapia
brewer dried grain
Growth performance
feed utilization
body composition
economic efficiency
2013
12
01
49
57
https://ejabf.journals.ekb.eg/article_2185_5ecea775fa2f8a13da90fbea4504e74f.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2013
17
4
Using Remote Sensing and GIS for mapping and monitoring marine habitats in Nabq (MRPA), South Sinai, Egypt
Abdel-Kader
Hassan
Mohamed
Abou-Zaid1
Sameh
El-Kafrawy
Mahmoud
Ahmed
Egypt has sought to protect its natural resources and marine biodiversity that arelocated in the Gulf of Aqaba by establishing a network of Marine Protected Areas.Nabq Managed Resources Protected Area (NMRPA) is the biggest marineprotectorate exists in the region and characterized by the great diversity of habitatsand ecosystems in a uniquely compact setting, representing a complete terrestrial/marine ecosystem characteristic of the Gulf of Aqaba coast. The applying of advancedtechnologies such as Remote Sensing (RS) and Geographic Information System (GIS)in recognizing the changes in the coastal zone habitats in the area; gave us the abilityto map and monitor the amount and the causes of changes in the habitats in a specific,fast, accurate and a relatively low-cost alternative to traditional field studies. Using atime series of four imageries; three (SPOT-4) imageries dated 2006, 2009 and 2010beside one (Quick-Bird) imagery dated 2010; we explored the utility of temporaltexture as a diagnostic tool to detect ecological changes in coastal zone habitats. Weused a time series of imageries to calculate the temporal variation in the brightness ofeach pixel, rather than statistically placing each pixel into a specific habitat class. Insitufieldwork on Nabq (MRPA) coastal zone confirmed that, the mangrove stock hasdeveloped, sea-grass habitat has developed from year to year too and the coral reefhabitat has been degraded. We propose that the further development of such remotesensing techniques will lead to the establishment of an index of habitat variability.Such an index could alert resource managers to potential problems on coastal zonehabitat otherwise would go undetected.
Remote Sensing
GIS
SPOT-4
Quick-Bird
Nabq
Change Detection
ecosystem
Monitoring
time series
Gulf of Aqaba
Egypt
2013
12
01
59
70
https://ejabf.journals.ekb.eg/article_2186_ecdd4e36f0b9da66f1aa731b9a69c1cd.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2013
17
4
Coral colonization and fish assemblage on an artificial reef off Hurghada, Red Sea, Egypt
Mohammed
Kotb
Artificial reefs were deployed as underwater scenery for recreational purposeand monitored for fishes and corals colonization during 2001, 2005 and 2010. Thediversity of the newly coral colonies showed a clear trend of increase over years. Thenumber of newly settled coral colonies increased significantly from 1897 in year 2005to 2040 colonies in year 2010. The fish abundance in the area of the artificial reefincreased from 120 in year 2001 to 17403 individuals in year 2010. The fish diversityincreased from 14 to 112 species between years 2001 and 2010. The successfulcolonization of corals and fishes on the artificial reefs supports the approach ofinstalling artificial reefs to be an effective rehabilitation and conservation method toreduce the potential impact of recreational activities on the Egyptian natural reefs.
Coral reef
colonization
conservational approach
long monitoring
Rea Sea
Egypt
2013
12
01
71
81
https://ejabf.journals.ekb.eg/article_2187_aab2985198d15aba68a64c1bb34137da.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2013
17
4
Histopathological changes in the Kidney of mosquito fish, Gambusia affinis and guppy fish, Poecilia reticulata exposed to Bisphenol A
Fathy
Elshaer
Walid
Abu-Shaeir
Sayed
Bakry
Bisphenol A (BPA) is an industrial chemical, used to manufacture polycarbonate and numerous plastic articles and leach to salt and fresh water. Low levels of BPA have also been found to cause biological effects, and its mode of actionappears to mimic that of the female hormone, estrogen. BPA therefore belongs to a group of chemicals termed “hormone disruptors” or “endocrine disruptors” that areable to disrupt the chemical messenger system in the body. The present study is aimed to assess the histological changes caused to the kidney tissues of both mosquito-fish(Gambusia affinis) and a guppy-fish (Poecilia reticulata) as a result of exposure to bisphenol A. These poeciliid fishes were exposed to 50μg/l of bisphenol A for 15 days (short term) and 30 days (long term). Histological examination of the kidney treated with Bisphenol A in both fish species showed a variety of histopathological effects; like inter tubular edema, shrinkage of glomeruli, glomerular distortion, vaculation of tubular cells, necrosis and atrophy of renal tubules, severe congestion and blood hemolysis, fluid stagnation in renal tubules and moderate aggregation of macrophages.In conclusions, our study concluded that, the concentration 50μg/l of BPA has ability to induce harmful effect on the kidney tissue of fishes and these effects are time dependent.
Kidney- Guppy fish-Mosquito-fish- BPA
2013
12
01
83
93
https://ejabf.journals.ekb.eg/article_2188_b8972612d9f8bebaf57571e4a3c8ed4c.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2013
17
4
Effect of lessepsian immigrant species on demersal catches operating along the Egyptian Mediterranean waters
Shnoudy
Bakhoum
Amal
Philips
Evelyn
Ragheb
The present study was carried out on the lessepsian immigrant fishes caught with trawl nets in the Egyptian Mediterranean waters. Based on previously reported data during summer and winter 2008 and winter & spring 2009, along the western and eastern Egyptian Mediterranean waters from El-Arish to El-Salloom using the research vessel "Salsabil" of the National Institute of Oceanography and Fisheries. The relative abundance by number and weight of immigrant species represented 60.46% and 48.50% respectively from the total fish catch. El –Shalya regioncontained the most abundant species by number (94.41%) and weight (95.11%). The analysis of variance test, indicated that differences in abundance of immigrant species in different water depths by number (F = 1.225, p > 0.05) andbyweight (F = 1.235, p > 0.05) were not significant. The most common immigrant species was Erugosquilla massavensis, representing 26.61% by number, and Fistularia commersonii dominated the immigrant species catches by weight (23.22%). Immigrant fishes expanded their distribution up to El-Salloom at the western border of the Egyptian Mediterranean coast. The results of Shannon’s Index (H') and Simpson's dominance index (c) led us to consider that the local community at depth 100-150 was more diverse than other habitats.
The lessepsian immigrant species
trawl net catch
Egyptian Mediterranean waters
2013
12
01
95
103
https://ejabf.journals.ekb.eg/article_2189_8099ccbb1ae4cd1d0c25f67abf4e066a.pdf