2024-03-29T08:42:55Z
https://ejabf.journals.ekb.eg/?_action=export&rf=summon&issue=472
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2017
21
1
Karyological Characterization of Three Fish Species (Family: Characidae)
Ali H.
Abu-Almaaty
Mohamed K.
Hassan
Iman M.
Bahgat
Mariam E. E.
Suleiman
The number of cytogenetic studies of fresh water fishes was increased in the recent years. Fish groups, such as Family: Characidae, comprises many of fishes which have economic importance. In the present study, the metaphase chromosomes and their karyotypes have been studied in three species of that family by using cytogenetic analysis. Fish species were Gymnocorymbus ternetzi, Moenkhausia sanctaefilomenae and Metynnis argenteus. All samples were collected from ornamental fish farms in Egypt. The diploid chromosome number and fundamental numbers of the three species under study were 2n = 50 and FN = 80, 2n = 50 and FN = 100 and 2n = 62 and FN = 122, respectively.
Zoology- Cytogenetics- Karyotype- Metaphase- Fishes- family Characidae
2017
05
01
1
9
https://ejabf.journals.ekb.eg/article_2375_072e17779fac2875928011ef020bd31d.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2017
21
1
Assessment of shoreline stability and solidity for future investment plans at Ras El-Bar Resort (EGYPT).
Walaa A.
Ali
Mona F.
Kaiser
Suzan
Kholief
Maysara
El-Tahan
Ras El-Bar resort located in the northeastern Egyptian Nile Delta coast includes a very active sandy beach coastline, which extends roughly 12 km west of Damietta Nile branch. Erosion along the coast of Ras El-Bar resort has been mitigated by constructing a series of coastal engineering structures that include jetties, groins, seawalls and detached breakwaters. The Project of protecting Ras El-bar resort started early in 1941 and ended in 2010 and aimed to decrease the continuous erosion and protecting the investments at the Ras El-bar resort. Studying shore line change at this region is important in making the development plan of protection works along the Egyptian northeastern coast by evaluating the effect of constructed detached breakwaters on shoreline. The purpose of this paper is to calculate the change detection rate of Ras El-bar shoreline at the last 15 years (2000-2015) and to evaluate the effect of basaltic stones and dollos blocks that constructed to re-protect the western jetty and fanar area by mitigating beach erosion. Besides, this study aimed to determine the degree of shoreline stability and solidity for future investment plans. Remote Sensing (RS) technique was used as a low cost method to Evaluate the morphologic changes (erosion/accretion patterns) from analysing Landsat-8, spot4, ETM+, and Egypt sat satellite images that acquired in the period from (2000-2015) to get the shoreline vector position of each date year. It was found that the shoreline change rate at Ras El-Bar resort at present study in the period from 2000-2015 has reached an erosion rate of (-0.1:-1.1m/yr) and a rate of accretion that reached to (+0.2:+4m/yr) at maximum. These rates values consider as the ideal values for stable beach and enabled us to give a clear conclusion that Ras El-Bar's beaches behind the detached breakwaters are stable and no need for future protection in the near future. Therefore, this study did not examine the area hydrodynamiclly because there is no need for that, since the message given by the stable beach for a long time is a strong testament refers to a balance of bilateral dimensions within the depths of coastal zone. As long as the beach is stable, the surf zone is stable.
Probiotic- Growth- feed utilization- Nile tilapia
2017
05
01
11
23
https://ejabf.journals.ekb.eg/article_2377_4a2b2456974f808a4996ed597eeb7ce3.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2017
21
1
Physiological and haematological responses of the Nile tilapia (Oreochromis niloticus) fed on diets supplemented with probiotics
Ahmed E.
Hassanien
Gihan M.
El-Moghazy
Mahmoud M.
Iraqi
Magdy A.
Soltan
Gamal A.
Elsayad
A 12-week feeding trial was conducted to evaluate the effect of dietary probiotic, Saccharomyces cerevisiae and Lactobacillus acidophilus at a concentration of (108cfu/ml).Three isonitrogenous (300 g CP kg-1 dry matter, DM) and isocaloric (3500Kcal metabolizable energy kg-1 DM) diets were formulated and probiotics was supplemented in the experimental diets. Fingerlings averaging 2.80±0.05g were randomly distributed into 18 glass aquaria (160 liter) and each aquarium holding 15 fish and randomly assigned to one of six replicates of the diets and offered feed at a daily rate of 5% of the total fish biomass. After 12 weeks, fish fed the diets supplemented with the two probiotics showed significantly better final weight, body length, specific growth rate, weight gain, feed intake, feed conversion ratio and protein efficiency ratio than those fed the control diet. The highest red blood cells count (RBCs), Hemoglobin (Hb), hematocrite (Hct), and the lowest mortality rate were recorded for fish fed the diet supplemented with S. cerevisiae supplemented compared to the other two groups. Fish fed the diet supplemented with S. Cerevisiae followed by L. acidophilus recorded the lowest (P<0.001) serum transaminase enzymes (alanine transaminase, ALT and aspartate transaminase, AST). Fish fed S. cerevisiae and L. acidophilus supplemented diets showed the lowest significant (P<0.001) count of microbial content in surface and muscles of Nile tilapia.
Probiotic- Growth- feed utilization- Nile tilapia
2017
05
01
25
36
https://ejabf.journals.ekb.eg/article_2378_939f05585f56654d6c38eb3a66660e48.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2017
21
1
Assessment of coastal changes along Baltim resort (Egypt) using remote sensing and DSAS method
Walaa A.
Ali
Mona F.
Kaiser
Suzan
Kholief
Maysara
El-Tahan
Baltim resort has exposed to severe erosion due to critical natural factors, especially after the establishment of Aswan High Dam. The number of detached breakwater along Baltim resort is 14 detached breakwaters; nine of them were constructed in the period (1993-2002). The other 5 segments were constructed in the period after 2003 with the same dimensions; in addition, 9 short groins were constructed on the west of Kitchener drain). The present study was conducted to evaluate the recent shoreline sedimentation patterns and to determine whether the implemented detached breakwater systems along Baltim resort have affected that patterns or not. Quality assessment through quantitative method has been used to validate the used data, since the used images in this research are from 4 different satellite sensors; where the special and spectral resolutions are not equal. In this study, the behavior of Baltim resort's coastline was analyzed after the construction of the detached breakwaters #9 to #14, to determine whether the general erosion/ accretion pattern along the resort has been reshaped or not. Shoreline change detection was calculated using the Digital Shoreline Analysis System (DSAS). The rate of shoreline change was estimated from three statistical models of DSAS: Linear Regression Rate (LRR), End Point Rate (EPR) and Least Median of Square (LMS). Accretion in the form of tombolo between breakwaters #9 to 14 is found out to be very high with a maximum value reached ~ +32.4 m/yr, which recorded in front of breakwater #11, followed to the east by down-drift erosion that reached its maximum rate value to be ~ -34 m/y in front of the 9 groins west of Kitchener drain. At the east of Kitchener drain severe erosion happened to a distance of 5.7 km and after that distance, the shoreline is almost stable and this pattern matches with the calculated alongshore rate of shoreline changes of the present study.
Baltim
Landsat 8
quality assessment
DSAS
GIS
Shoreline
RS
2017
05
01
37
48
https://ejabf.journals.ekb.eg/article_2380_f656b0db1229c6f27fc49348a6a91663.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2017
21
1
Impact of physico-chemical parameters on composition and diversity of zooplankton community in Nozha hydrodrome, Alexandria, Egypt
Mona Hamed
Ahmed
Nadia N. B.
Abd El-Hamed
Naglaa I.
Shalby
This study was carried out in Nozha hydrodrome, Alexandria, to assess the impact of physico-chemical parameters upon zooplankton community structure and diversity during the period from December 2015 to November. 2016. The results indicated that there were significant monthly variations in physical and chemical characteristics, such as water temperature, pH, dissolved oxygen, total alkalinity, total hardness, nitrite, nitrate, total nitrogen,orthophosphate and total phosphorus. Zooplankton were represented by fifteen genera belong to four groups. Rotifera constituted the main dominant group contributing 82.59% of the total zooplankton, followed by Copepoda (12.33%), Cladocera (3.886%) and Ostracoda (1.22%). The highest density of zooplankton was recorded during January (mean 2504.5 org/ l), while the lowest was found in July (mean 44.25 org/l).The data pointed out that the most effective water variables on composition and distribution of zooplankton were water temperature, total alkalinity, total hardness, ammonia, nitrite, nitrate and total nitrogen. The low value of Shannon diversity index, high value of some water parameters and dominance of pollution tolerant forms of zooplankton revealed that the hydrodrome is suffering from organic pollution.
Nozha hydrodrome
Zooplankton
physico-chemical parameters
Shannon diversity index
2017
05
01
49
62
https://ejabf.journals.ekb.eg/article_2382_607fb7fd4b7f024baec4a218cd985f7f.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2017
21
1
Studies on age, growth, and mortality rates for management of the redspot emperor, Lethrinus lentjan (Lacepède, 1802) in the Egyptian sector of Red Sea
Samir A.
Zaahkouk
Hassan M.
Khalaf-Allah
Sahar F.
Mehanna
Fahmy I.
El-Gammal
Ahmed F.
Makkey
Age, growth and mortality are very important parameters for rational exploitation and management of the fish population. Age, growth, mortality and exploitation rates were studied to assess the current status of the redspot emperor Lethrinus lentjan stock in the Egyptian sector of Red Sea. The study was based on a total of 943 specimens that collected during 2014 and 2015 with total length range of 11.5 to 50.7 cm. Results showed that, the maximum life span of L. lentjan in the Egyptian Red Sea was 6 years and age group one is the most frequent one forming up to 54% of the total catch. L. lentjan attains its highest growth in length at the end of the first year of life (24.45 cm) after which the annual increment in length decreases gradually with the further increase in age. The b-value of length-weight relationship was estimated at 3.03 indicating a tendency towards isometric growth. The composite coefficient "kc" and the relative condition factor "Kn" were fluctuated according to different fish length groups and months. The length at first capture was Lc = 20.11 cm with corresponding age Tc = 0.58 year. The total mortality of L. lentjan (Z= 1.52/yr), natural mortality (M = 0.35/yr) and fishing mortality (F = 1.17/yr) were lead to an exploitation ratio of E = 0.77. The high values of both F and E are reflecting the high level of exploitation of this species in the Egyptian Red Sea waters.
Lethrinus lentjan- Age- Growth- mortality rate- Red Sea- Egypt
2017
05
01
63
72
https://ejabf.journals.ekb.eg/article_2384_4087b1dcb390287aad53cfa880378699.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2017
21
1
Impact of different lining substrata on biological and biochemical characteristics of the Nile Tilapia Oreochromis niloticus
Magdy, T
Khalil
Nahed, M. M.
Ismail
Ihab, K.
Mohamed
Suzan, E.
Ali
The effect of lining waterbodies on the growth performance and survival rate of the fish Oreochromis niloticus maintained in different lining substrata (cement, plastic and mud) and control (without lining) for 12 weeks was studied . It was found that there was no significant difference in the final mean size (length and weight) among the different groups; the fish length were 18.01±0.26, 17.73±0.15, 17.33±0.2 and 17.83±0.14 cm for cement, plastic, mud and control, respectively and weight (15.94±0.11, 15.73±0.2, 15.52±0.34 and 15.39±0.26 g for cement, plastic, mud and control respectively. The calculated condition factor (K-value) was 0.27±0.01, 0.28±0.0, 0.3±0.0 and 0.27±0.0 for fish maintained in cement, plastic, mud and control, respectively; which also wasn`t significantly differ among the study groups. In addition, determination of length increment (LI), the average weight gain (AWG), average daily weight gain (ADWG), the relative growth rate (RGR %) and specific growth rate (SGR %) of O. niloticus indicated that there is no significant differences obtained between the lining materials and control ones. In the same way, the biochemical analysis of the blood show no significant differences among fish groups maintained in different substrata. The electrophoretic patterns of tissue soluble-proteins extracted from the fish maintained in the tested lining media (mud, cement, and plastic) and control ones for a period of 12 weeks were also studied. It was found that the control group yielded 12 protein fractions of molecular masses between 165.24 and 12.34 kDa. Whereas, only 11 protein bands appeared in fish group maintained in cement substratum ranging from 162.62 to 12.15 kDa. Fish groups maintained in plastic and mud substratum obtained the same number of protein bands (14 bands) with molecular weight varied from 152.54 to 12.49 and from 165.24 to 12.34 kDa, respectively. Fish in cement group demonstrates the highest similarity indices with the two groups; control and mud with similarity index of 0.96 and 0.88, respectively. While the plastic fish groups show a similarity index of 0.69 and 0.79 with the same groups, respectively. It could be concluded that the application of lining the waterbodies (whatever the used material) hasn`t negative impact, on the growth performance, blood biochemical analysis and the protein profiles, comparing to the mud and control groups.
Lining media- Oreochromis niloticus- Growth performance- Biochemistry- Electrophoretic protein- SDS-PAGE
2017
05
01
73
85
https://ejabf.journals.ekb.eg/article_2385_ccc840e25f2f8be729c482b726798f91.pdf
Egyptian Journal of Aquatic Biology and Fisheries
Egypt. J. of Aquatic Biolo. and Fish.
1110-6131
1110-6131
2017
21
1
Environmental Indices and Phytoplankton Community Structure as Biological Indicators for Water Quality of the River Nile, Egypt
Elham M.
Ali
Ahlam
El Shehawy
The River Nile is the principal freshwater resource in Egypt, meeting nearly all demands for drinking water, irrigation, and industry. The objective of this present study is to characterize the current environmental variables and the existent populations of phytoplankton along a segment of the River Nile near Mansoura City. The direct estimation of phytoplankton cell number gave an estimation of the standing crop. A total of 214 different planktonic algal taxa belonging to 64 genera were identified. Maximum peak of 106.9Х106cellsl¹ was recorded at S2 in April, of which cyanophycean specieswere themostdominant. Most of used indices, especially those diatom-dependent ones, gave a reliable indication of water quality with distinct irregular local variations. A significant decrease in species diversity was recorded at S4 during June indicating a significant level of water pollution. However, the diversity index was 1.06 referring to a moderate to light pollution conditions. The saprobic index mean value is 1.96 indicating an oligosaprobic to β-mesosaprobic conditions and the existence of blue-greens indicates a degree of toxicity. The integrated results between (measured and calculated) generally described the Nile water quality as in moderated level with some cases of temporal disqualify of potable with poor to very poor status at some sites, which mean it is within the standard level of drinking water as approved by the national and international agencies. Although temporal and spatial data confirmed the importance to set some environmental legalization and policies to ensure that the Nile water is maintained appropriately for the identified usage sector.
River Nile
phytoplankton
composition
species succession
Pollution index
Eutrophication
Diversity Index
2017
05
01
87
104
https://ejabf.journals.ekb.eg/article_2387_04f4c4ef37901b480ef25b23fd6eccd0.pdf