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Hanan M. Khairy
Fish Reproduction Laboratory, National Institute of Oceanography and Fisheries, Alexandria, Egypt

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Research paper
Published: 08 July 2021 in Rendiconti Lincei. Scienze Fisiche e Naturali
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Recently, the use of microalgal bioproducts in aquaculture research has gotten consideration. The current study aims to screen the biochemical components of three microalgae: Nannochloropsis salina, Chlorella salina and Tetraselmis chuii for using in the feeding of Cyclops abyssorum divergens copepods that are suitable prey for the mouth gape of the cultured fish larvae. The effect of different initial densities of these algal cells used for copepods feeding was determined by estimation of proximate composition, polyunsaturated fatty acids (PUFAs), amino acids (AAs) and enzyme activities of copepods. N. salina showed high protein and lipid contents, while C. salina presented high carbohydrate content. C. salina and T. chuii presented high PUFAs, with proportions of 22.35 and 22.67%, respectively, and are considered as the source of n-3 fatty acids. Also, they had higher concentrations of total AAs (21.46 and 24.14 mg. g−1 dry wt., respectively). The experiment study showed that the C. salina diet at an initial concentration of 1 × 106 cells ml−1 resulted in a maximum increase of copepods population density (503.3%) and high protease and trypsin activities (42.65 and 31.80 U. mg−1 protein, respectively) in copepods. T. chuii diet at an initial concentration of 1 × 106 cells ml−1 resulted in a maximum protein, lipid, PUFAs and AAs contents of copepods. Therefore, C. abyssorum divergens copepods after 18 days feeding with an initial concentration of 1 × 106 C. salina or T. chuii cells ml−1 are the suitable candidate diets in larviculture because they achieved higher productivity and attained better nutritional composition of the copepods.

ACS Style

Heba S. El-Sayed; Hoda H. Senousy; Aml Z. Ghoneim; Gihan M. El-Khodary; Mohamed A. El-Sheikh; Hanan M. Khairy; Salwa A. El-Saidy. Screening the biochemical composition of some marine microalgal species for feeding Cyclops abyssorum divergens. Rendiconti Lincei. Scienze Fisiche e Naturali 2021, 32, 609 -624.

AMA Style

Heba S. El-Sayed, Hoda H. Senousy, Aml Z. Ghoneim, Gihan M. El-Khodary, Mohamed A. El-Sheikh, Hanan M. Khairy, Salwa A. El-Saidy. Screening the biochemical composition of some marine microalgal species for feeding Cyclops abyssorum divergens. Rendiconti Lincei. Scienze Fisiche e Naturali. 2021; 32 (3):609-624.

Chicago/Turabian Style

Heba S. El-Sayed; Hoda H. Senousy; Aml Z. Ghoneim; Gihan M. El-Khodary; Mohamed A. El-Sheikh; Hanan M. Khairy; Salwa A. El-Saidy. 2021. "Screening the biochemical composition of some marine microalgal species for feeding Cyclops abyssorum divergens." Rendiconti Lincei. Scienze Fisiche e Naturali 32, no. 3: 609-624.

Journal article
Published: 20 May 2021 in Saudi Journal of Biological Sciences
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In marine ecosystems, fluctuations in surface-seawater carbon dioxide (CO2), significantly influence the whole metabolism of marine algae, especially during the early stages of macroalgal development. In this study, the response of the green alga Ulva fasciata for elevating ocean acidification was investigated using four levels of pCO2 ~ 280, 550, 750 and 1050 µatm. Maximum growth rate (6.6% day−1), protein (32.43 %DW) and pigment (2.9 mg/g) accumulation were observed at pCO2-550 with an increase of ~2-fold compared to control. On the other hand, lipid and carbohydrate contents recorded their maximum production (4.23 and 46.96 %DW, respectively) at pCO2-750 while control showed 3.70 and 42.37 %DW, respectively. SDS-PAGE showed the presence of unique bands in response to pCO2, especially at 550 µatm. Dominant associated bacteria was shifted from Halomonas hydrothermalis of control to Vibrio toranzoniae at pCO2-1050. These findings suggest that ocean acidification at 550 µatm might impose noticeable effects on growth, protein, pigments, and protein profile of U. fasciata, which could be a good source for fish farming. While, pCO2-750 was recommended for energetic purpose, due to its high lipid and carbohydrate contents.

ACS Style

Khouloud M. Barakat; Heba S. El-Sayed; Hanan M. Khairy; Mohamed A. El-Sheikh; Sarah A. Al-Rashed; Ibrahim A. Arif; Mostafa E. Elshobary. Effects of ocean acidification on the growth and biochemical composition of a green alga (Ulva fasciata) and its associated microbiota. Saudi Journal of Biological Sciences 2021, 28, 5106 -5114.

AMA Style

Khouloud M. Barakat, Heba S. El-Sayed, Hanan M. Khairy, Mohamed A. El-Sheikh, Sarah A. Al-Rashed, Ibrahim A. Arif, Mostafa E. Elshobary. Effects of ocean acidification on the growth and biochemical composition of a green alga (Ulva fasciata) and its associated microbiota. Saudi Journal of Biological Sciences. 2021; 28 (9):5106-5114.

Chicago/Turabian Style

Khouloud M. Barakat; Heba S. El-Sayed; Hanan M. Khairy; Mohamed A. El-Sheikh; Sarah A. Al-Rashed; Ibrahim A. Arif; Mostafa E. Elshobary. 2021. "Effects of ocean acidification on the growth and biochemical composition of a green alga (Ulva fasciata) and its associated microbiota." Saudi Journal of Biological Sciences 28, no. 9: 5106-5114.

Journal article
Published: 08 May 2021 in Aquaculture Reports
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Larval rearing techniques with suitable nursery feed should be prioritized for better survival and growth. We evaluate the potential use of Cyclops abyssorum divergens as a natural live food candidate instead of the costly traditional Artemia franciscana in the feeding strategy for Dicentrarchus labrax larvae. C. abyssorum divergens and A. franciscana were enriched with mixed valuable algae strains (Isochrysis galbana, Tetraselmis chuii, Chlorella marina and Nannochloropsis oculata) that were used in equal biomass proportions (1:1:1:1) on dry weight basis. Amino acids and fatty acid profiles were found to be highly significantly different in enriched C. abyssorum divergens (EC) compared to enriched A. franciscana (EA). The findings also revealed compensated deficiency in some amino acids such as histidine, isoleucine, and methionine in EC and also increased levels of total essential amino acids (EAA) in EC by 8.2 % more than that of EA. Further metabolizing of palmitic acid (C16:0) and bio-conversion of α- linolenic acid, ALA (C18:3 n-3) to high accumulation of DHA fatty acid lead to higher PUFAs contents in EC and lower levels in EA. Specific growth rates (SGR) and survival percentages (S %) of D. labrax were higher in larvae fed with EC compared to the lower values in EA. Moreover, analyzing final carcass composition revealed increased levels of DHA fatty acid attaining DHA/EPA ratio in fish-fed EC of 2.95 % (>1) compared to 0.90 % (<1) in larvae-fed EA. The elevated levels of the amino acids in the larvae-fed EC were a yardstick to the surged growth and survival rate of the examined species. The present study concluded that C. abyssorum divergens is the best promising candidate for Sea bass larvae-culture.

ACS Style

Heba S. El-Sayed; Amal Z. Ghonim; Gihan M. El-Khodary; Mohamed A. El-Sheikh; Hanan M. Khairy. Application of enriched Cyclops abyssorum divergens with mixed algal diet compared to Artemia franciscana for improving larval growth and body composition of Dicentrarchus labrax. Aquaculture Reports 2021, 20, 100715 .

AMA Style

Heba S. El-Sayed, Amal Z. Ghonim, Gihan M. El-Khodary, Mohamed A. El-Sheikh, Hanan M. Khairy. Application of enriched Cyclops abyssorum divergens with mixed algal diet compared to Artemia franciscana for improving larval growth and body composition of Dicentrarchus labrax. Aquaculture Reports. 2021; 20 ():100715.

Chicago/Turabian Style

Heba S. El-Sayed; Amal Z. Ghonim; Gihan M. El-Khodary; Mohamed A. El-Sheikh; Hanan M. Khairy. 2021. "Application of enriched Cyclops abyssorum divergens with mixed algal diet compared to Artemia franciscana for improving larval growth and body composition of Dicentrarchus labrax." Aquaculture Reports 20, no. : 100715.

Journal article
Published: 06 February 2021 in Sustainability
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To achieve strong, successful and commercial aqua-biotechnological microalgae applications, screening, isolation, molecular identification, and physiological characterizations are needed. In the current study, a native cyanobacteria strain Arthrospira platensis NIOF17/003 was isolated from the surface water of El-Khadra Lake, a saline-alkaline lake located in Wadi El-Natrun, Egypt. The cyanobacterium was phylogenetically identified by 16S rRNA molecular marker and deposited in the GenBank database (accession number MW396472). The late exponential phase of A. platensis NIOF17/003 was reached at the 8th day of growth using Zarrouk medium, with a recorded dry weight (DW) of 0.845 g L−1. The isolated strain showed 52% of protein, 14% of carbohydrate, biomass productivity of 143.83 mg L−1 day−1, 8.5% of lipid, and lipid productivity of 14.37 mg L−1 day−1. In general, the values of cetane number, iodine value, cold filter plugging point (52.9, 85.5 g I2/100 g oil, and −2.2 °C, respectively) of the isolated fatty acid methyl esters are in accordance with those suggested by international standards. Besides, applying algal-free lipid (FL) as biodiesel byproduct in the production of rotifer (Brachionus plicatilis) revealed that a 0.6 g L−1 FL significantly increased the rotifer population females carrying eggs, confirming that FL can be used efficiently for B. plicatilis production. The current study concluded that the new isolate A. platensis NIOF17/003 is a promising strain for double sustainable use in biodiesel production and aquaculture feed.

ACS Style

Mohamed Zaki; Mohamed Ashour; Ahmed Heneash; Mohamed Mabrouk; Ahmed Alprol; Hanan Khairy; Abdelaziz Nour; Abdallah Mansour; Hesham Hassanien; Ahmed Gaber; Mostafa Elshobary. Potential Applications of Native Cyanobacterium Isolate (Arthrospira platensis NIOF17/003) for Biodiesel Production and Utilization of Its Byproduct in Marine Rotifer (Brachionus plicatilis) Production. Sustainability 2021, 13, 1769 .

AMA Style

Mohamed Zaki, Mohamed Ashour, Ahmed Heneash, Mohamed Mabrouk, Ahmed Alprol, Hanan Khairy, Abdelaziz Nour, Abdallah Mansour, Hesham Hassanien, Ahmed Gaber, Mostafa Elshobary. Potential Applications of Native Cyanobacterium Isolate (Arthrospira platensis NIOF17/003) for Biodiesel Production and Utilization of Its Byproduct in Marine Rotifer (Brachionus plicatilis) Production. Sustainability. 2021; 13 (4):1769.

Chicago/Turabian Style

Mohamed Zaki; Mohamed Ashour; Ahmed Heneash; Mohamed Mabrouk; Ahmed Alprol; Hanan Khairy; Abdelaziz Nour; Abdallah Mansour; Hesham Hassanien; Ahmed Gaber; Mostafa Elshobary. 2021. "Potential Applications of Native Cyanobacterium Isolate (Arthrospira platensis NIOF17/003) for Biodiesel Production and Utilization of Its Byproduct in Marine Rotifer (Brachionus plicatilis) Production." Sustainability 13, no. 4: 1769.

Original article
Published: 01 June 2020 in Egyptian Journal of Aquatic Biology and Fisheries
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ACS Style

Hanan M. Khairy; Hawazin H. Mutawie; Heba S. El-Sayed; Nayrah A. Shaltout. Biodiesel Production, Characterization and Biochemical Variability by Microalga Nannochloropsis oculata under Stressed Culture Conditions. Egyptian Journal of Aquatic Biology and Fisheries 2020, 24, 451 -462.

AMA Style

Hanan M. Khairy, Hawazin H. Mutawie, Heba S. El-Sayed, Nayrah A. Shaltout. Biodiesel Production, Characterization and Biochemical Variability by Microalga Nannochloropsis oculata under Stressed Culture Conditions. Egyptian Journal of Aquatic Biology and Fisheries. 2020; 24 (3):451-462.

Chicago/Turabian Style

Hanan M. Khairy; Hawazin H. Mutawie; Heba S. El-Sayed; Nayrah A. Shaltout. 2020. "Biodiesel Production, Characterization and Biochemical Variability by Microalga Nannochloropsis oculata under Stressed Culture Conditions." Egyptian Journal of Aquatic Biology and Fisheries 24, no. 3: 451-462.

Journal article
Published: 07 February 2020 in The Egyptian Journal of Aquatic Research
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The species composition and abundance of phytoplankton were studied weekly from 16 June 2011 to 30 May 2012 at a fixed station in the Eastern Harbor (EH), a semi-closed basin; in Alexandria City The results indicated that, the phytoplankton standing crop varied between a minimum of 1.08 × 103 and a maximum of 1.57 × 106 cells·l−1. The phytoplankton community was represented by a total of 132 species, including 72 diatoms, with a percentage frequency of 96.42% and 37 dinoflagellates (3.34%), as well as few representatives of different freshwater groups. The Shannon–Wiener diversity, varied broadly from 0.0076 to 3.19 bits. cell−1, Stable community accompanied the low values, while higher diversities corresponded to non-steady state periods. Water quality was estimated according to phytoplankton density and based on inorganic nutrient data (P-PO4, N-NO3, N-NO2, N-NH3), the aquatic system was divided into oligotrophic, mesotrophic and eutrophic water types. A correlation coefficient of biological factors with some environmental conditions are provided and discussed. Further, Principle Component Analysis (PCA) which was used to analyze water quality of weekly data and its results were discussed.

ACS Style

Fatma AbdEl-Rahman Zaghloul; Hanan Mohamed Khairy; Nabila Ragab Hussein. Assessment of phytoplankton community structure and water quality in the Eastern Harbor of Alexandria, Egypt. The Egyptian Journal of Aquatic Research 2020, 46, 145 -151.

AMA Style

Fatma AbdEl-Rahman Zaghloul, Hanan Mohamed Khairy, Nabila Ragab Hussein. Assessment of phytoplankton community structure and water quality in the Eastern Harbor of Alexandria, Egypt. The Egyptian Journal of Aquatic Research. 2020; 46 (2):145-151.

Chicago/Turabian Style

Fatma AbdEl-Rahman Zaghloul; Hanan Mohamed Khairy; Nabila Ragab Hussein. 2020. "Assessment of phytoplankton community structure and water quality in the Eastern Harbor of Alexandria, Egypt." The Egyptian Journal of Aquatic Research 46, no. 2: 145-151.

Journal article
Published: 02 February 2015 in Saudi Journal of Biological Sciences
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Antioxidant activity and mineral composition were evaluated seasonally from spring to autumn 2010 in the three common seaweeds Ulva lactuca Linnaeus (Chlorophyta), Jania rubens (Linnaeus) J.V. Lamouroux and Pterocladia capillacea (S.G. Gmelin) Bornet (Rhodophyta). The antioxidant activity was measured with β-carotene, total phenol content and DPPH (2,2-diphenyl-1-picrylhydrazyl). Seaweeds were collected from the rocky site near Boughaz El-Maadya Abu-Qir Bay of Alexandria, Egypt. The results showed maximum increase of β-carotene in P. capillacea during summer. A significant increase in total phenolic content at P ⩽ 0.05 was found in the red alga (J. rubens) during summer. Also, U. lactuca showed the maximum antioxidant scavenging activity especially during summer. Minerals in all investigated samples were higher than those in conventional edible vegetables. Na/K ratio ranged between 0.78 and 2.4 mg/100 g, which is a favorable value. All trace metals exceeded the recommended doses by Reference Nutrient Intake (RNI). During summer season, it was found that Cu = 2.02 ± 0.13 and Cr = 0.46 ± 0.14 mg/100 g in U. lactuca and Fe had a suitable concentration (18.37 ± 0.5 mg/100 g) in P. capillacea. The studied species were rich in carotenoids, phenolic compounds, DPPH free radicals and minerals, therefore, they can be used as potential source of health food in human diets and may be of use to food industry.

ACS Style

Hanan M. Khairy; Mohamed A. El-Sheikh. Antioxidant activity and mineral composition of three Mediterranean common seaweeds from Abu-Qir Bay, Egypt. Saudi Journal of Biological Sciences 2015, 22, 623 -630.

AMA Style

Hanan M. Khairy, Mohamed A. El-Sheikh. Antioxidant activity and mineral composition of three Mediterranean common seaweeds from Abu-Qir Bay, Egypt. Saudi Journal of Biological Sciences. 2015; 22 (5):623-630.

Chicago/Turabian Style

Hanan M. Khairy; Mohamed A. El-Sheikh. 2015. "Antioxidant activity and mineral composition of three Mediterranean common seaweeds from Abu-Qir Bay, Egypt." Saudi Journal of Biological Sciences 22, no. 5: 623-630.

Journal article
Published: 01 May 2013 in Oceanologia
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Variations in protein, carbohydrate, lipid, ash, moisture, fatty acid and amino acid contents of the seaweeds Ulva lactuca Linnaeus (Chlorophyta), Jania rubens (Linnaeus) J.V. Lamouroux and Pterocladia capillacea (S.G. Gmelin) Bornet (Rhodophyta) were studied seasonally from spring to autumn 2010. The seaweeds were collected from a rocky site near Boughaz El-Maadya on the coast of Abu Qir Bay east of Alexandria, Egypt. Remarkable seasonal variations were recorded in the levels of the studied parameters in the three species. Pterocladia capillacea was characterized by the highest protein and carbohydrate content throughout the different seasons, whereas Ulva lactuca contained more lipids (4.09±0.2%) than J. rubens and P. capillacea. The highest total fatty acids were recorded in J. rubens during the three seasons, while saturated fatty acids were predominant in P. capillacea during spring. This is due mainly to the presence of palmitic acid (C16:0), which made up 74.3% of the saturated fatty acids. The highest level of polyunsaturated fatty acids (PUFA) in these algae was measured in J. rubens; DHA (22:6ω3) was the main acid, making up 26.4% of the total fatty acids especially during summer. Proline was the major component of the amino acids in the three algal species, with maximum amounts in U. lactuca

ACS Style

Hanan M. Khairy; Shimaa M. El-Shafay. Seasonal variations in the biochemical composition of some common seaweed species from the coast of Abu Qir Bay, Alexandria, Egypt. Oceanologia 2013, 55, 435 -452.

AMA Style

Hanan M. Khairy, Shimaa M. El-Shafay. Seasonal variations in the biochemical composition of some common seaweed species from the coast of Abu Qir Bay, Alexandria, Egypt. Oceanologia. 2013; 55 (2):435-452.

Chicago/Turabian Style

Hanan M. Khairy; Shimaa M. El-Shafay. 2013. "Seasonal variations in the biochemical composition of some common seaweed species from the coast of Abu Qir Bay, Alexandria, Egypt." Oceanologia 55, no. 2: 435-452.