Egyptian Journal of Aquatic Research最新文献_第3页

The potential of hybrid electrocoagulation-membrane separation processes for performance enhancement and membrane fouling mitigation: A review 混合电凝膜分离工艺在提高性能和减轻膜污染方面的潜力：综述

IF 3.5

Egyptian Journal of Aquatic Research Pub Date : 2023-09-01 DOI: 10.1016/j.ejar.2023.08.007

Abeer A. Moneer

{"title":"The potential of hybrid electrocoagulation-membrane separation processes for performance enhancement and membrane fouling mitigation: A review","authors":"Abeer A. Moneer","doi":"10.1016/j.ejar.2023.08.007","DOIUrl":"https://doi.org/10.1016/j.ejar.2023.08.007","url":null,"abstract":"<div>Membrane separation processes have gained more attention with time for their rapid improvement in different aspects such as configurations, the introduction of innovative materials into the engineering of modules, and the development of membrane materials and manufacturing techniques. However, on the other hand, these techniques suffer from an extremely critical problem, which is membrane fouling. This is due to the tiny size of membrane pores, in addition to the pretreatment methods before membrane separation that can be a part of the problem. A simple and cost-effective technique like electrocoagulation (EC) can offer a solution; it has an advantageous capability to remove a wide range of pollutants efficiently and rapidly without using any additives that can cause secondary pollution. In this respect, the present review provides a thorough investigation of the role of EC as a pretreatment step preceding different membrane separation processes such as microfiltration, ultrafiltration, nanofiltration, reverse osmosis, membrane bioreactors, and membrane distillation, in addition to the effect of the hybrid process on the percentage of pollutants removal and the mitigation of membrane fouling as well. Most of the recent literature supports using the efficient pretreatment method of EC instead of the ordinary multiple pretreatment sequences.</div>","PeriodicalId":46117,"journal":{"name":"Egyptian Journal of Aquatic Research","volume":"49 3","pages":"Pages 269-282"},"PeriodicalIF":3.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49825919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Catch composition and species diversity during dredging operations of Mediterranean coastal lagoon, Lake Manzala, Egypt 埃及曼扎拉湖地中海沿岸泻湖疏浚作业期间的渔获物组成和物种多样性

IF 3.5

Egyptian Journal of Aquatic Research Pub Date : 2023-09-01 DOI: 10.1016/j.ejar.2023.07.002

Kariman Shalloof , Azza El-Ganiny , Alaa El-Far, Mohamed Fetouh , Walid Aly , Amal Amin

{"title":"Catch composition and species diversity during dredging operations of Mediterranean coastal lagoon, Lake Manzala, Egypt","authors":"Kariman Shalloof , Azza El-Ganiny , Alaa El-Far, Mohamed Fetouh , Walid Aly , Amal Amin","doi":"10.1016/j.ejar.2023.07.002","DOIUrl":"https://doi.org/10.1016/j.ejar.2023.07.002","url":null,"abstract":"<div>Lake Manzala, the largest Egyptian coastal lake, is one of the most valuable fish sources in Egypt, which contributes about 14% to the total annual Egyptian fisheries production. However, given that Lake Manzala suffers from major environmental and fisheries problems, an ambitious national project for the dredging, purification, and development of this lake was established in 2017. Hence, this study was conducted to assess seasonal diversity and to provide an inventory of fish species at Lake Manzala during dredging operations. Five seasonal surveys were conducted during the period from 2019 to 2021. By using different fishing gears and methods operating in the lake, a total of 7774 fish and crustaceans—belonging to 29 fish species and three crustacean species that clump into 21 families—were collected from Lake Manzala. During the study period, the family Cichlidae showed the highest occurrence of about 70%. The marine-brackish species recorded the highest aquatic environment (milieu) diversity with 34.4% of the collected species, but only 12.5% of the freshwater species. Six of the collected fish species were recorded of Indo-pacific origin, as Lissepsian migrant species. In this study, the diversity index (H) was calculated, ranging between 1.13 and 1.77. As indicated by the seasonal variation of the diversity index, the highest diversity index of Lake Manzala was evident in autumn 2019 and spring 2021 at 1.700 and 1.365, respectively. The governmental dredging and cleaning operations in the lake have a relative impact on the species composition in this area. Further studies are recommended after the completion of these operations to confirm the impact of dredging on species composition alteration.</div>","PeriodicalId":46117,"journal":{"name":"Egyptian Journal of Aquatic Research","volume":"49 3","pages":"Pages 347-352"},"PeriodicalIF":3.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49785908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Water quality index and physicochemical parameters effect on the corrosion rate of steel along the Egyptian Mediterranean Sea 埃及地中海沿岸水质指标和理化参数对钢铁腐蚀速率的影响

IF 3.5

Egyptian Journal of Aquatic Research Pub Date : 2023-09-01 DOI: 10.1016/j.ejar.2023.05.002

Manal G. Mahmoud, Abeer A.M. El-Sayed, Madelyn N. Moawad, E.R. Sallam, Laila A. Mohamed, Hermine R.Z. Tadros

{"title":"Water quality index and physicochemical parameters effect on the corrosion rate of steel along the Egyptian Mediterranean Sea","authors":"Manal G. Mahmoud, Abeer A.M. El-Sayed, Madelyn N. Moawad, E.R. Sallam, Laila A. Mohamed, Hermine R.Z. Tadros","doi":"10.1016/j.ejar.2023.05.002","DOIUrl":"https://doi.org/10.1016/j.ejar.2023.05.002","url":null,"abstract":"<div>This study aims to discuss some physicochemical parameters and their effect on steel corrosion rate in natural seawater collected from different sectors along the Egyptian coast of the Mediterranean Sea. Samples were collected from eight eastern sectors including 48 stations during autumn of 2021, and from twelve western sectors including 72 stations during spring of 2022. The steel corrosion rate was determined by using the weight loss technique on a laboratory scale. Results ranges and total averages revealed that salinity (20.630–42.020) 38.540‰ in 2021 and (37.771–39.304) 38.831‰ in 2022; the pH (8.28–8.41) in 2021 and (7.69–8.15) in 2022; dissolved oxygen (3.00–4.73) 3.65 mg/L in 2021 and (2.88–6.98) 4.481 mg/L in 2022; oxidizable organic matter (1.10–2.60) 2.08 mg/L in 2021 and (depletion–0.93) 0.304 mg/L in 2022; phosphate (0.022–10.876) 4.142 µM in 2021 and (depletion–5.432) 0.612 µM in 2022; nitrite (depletion–1.325) 0.379 µM in 2021 and (depletion–2.50) 0.211 µM in 2022; sulphate (2.044–3.876) 2.997 g/L in 2021 and (1.544–4.425) 2.645 g/L in 2022; and the steel corrosion rate (0.020–0.158) 0.088 mm/y in 2021 and (0.006–0.197) 0.078 mm/y in 2022. According to the Principal Component Analysis (PCA) data, the western stations had good water quality, while the eastern stations were polluted in different degrees related to the increase in human activities. Two statistical equations were obtained from the correlation between the steel corrosion rate and their corresponding physicochemical parameters.</div>","PeriodicalId":46117,"journal":{"name":"Egyptian Journal of Aquatic Research","volume":"49 3","pages":"Pages 313-318"},"PeriodicalIF":3.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49785912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Toxic effects of chromium chloride on hematology and histopathology of major carp (Labeo rohita) 氯化铬对大鲤鱼血液学和组织病理学的毒性作用

IF 3.5

Egyptian Journal of Aquatic Research Pub Date : 2023-09-01 DOI: 10.1016/j.ejar.2023.01.003

Amna Chaudhary , Komal gul Javaid , Erum Bughio

{"title":"Toxic effects of chromium chloride on hematology and histopathology of major carp (Labeo rohita)","authors":"Amna Chaudhary , Komal gul Javaid , Erum Bughio","doi":"10.1016/j.ejar.2023.01.003","DOIUrl":"https://doi.org/10.1016/j.ejar.2023.01.003","url":null,"abstract":"<div>Heavy metal contamination caused by human activities is a major threat to aquatic organisms. Therefore, a 28-day trial was designed to evaluate the hematological and histological changes in Labeo rohita exposed to chromium chloride. For this purpose, 240 fish (Labeo rohita) were randomly selected and divided into four groups. Three groups were treated with a sublethal waterborne concentration of chromium (37, 22, and 11 mgL−1); the fourth group was chromium-free control (0 mgL−1). Results demonstrated that noted values of hematological parameters, such as mean cell hemoglobin, red blood cells, hematocrit, platelets, and hemoglobin, were decreased significantly (P < 0.05) in experimental groups compared with control, while mean cell volume and white blood cells were increased. On the 28th day, a decline was observed in white blood cell values. The severity of histological lesions in the liver, kidney, and gills increased as the concentration and duration of chromium exposure increased. No histological change was observed in the control (T0), while T1 showed more severe changes than T2 and T3. Those results suggest that long-term exposure to chromium chloride causes adverse effects on the hematology and histology of major carp, Labeo rohita.</div>","PeriodicalId":46117,"journal":{"name":"Egyptian Journal of Aquatic Research","volume":"49 3","pages":"Pages 291-296"},"PeriodicalIF":3.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49785914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing fishery status and sustainable exploitation of spotted seabass (Dicentrarchus punctatus) in Bardawil Lagoon, Eastern Mediterranean, Egypt 评估埃及东地中海Bardawil泻湖斑点鲈鱼（Dicentrarchus punctatus）的渔业状况和可持续开发

IF 3.5

Egyptian Journal of Aquatic Research Pub Date : 2023-09-01 DOI: 10.1016/j.ejar.2023.06.001

Ayman S. Ahmed , Ezzat Mohammed-AbdAllah

{"title":"Assessing fishery status and sustainable exploitation of spotted seabass (Dicentrarchus punctatus) in Bardawil Lagoon, Eastern Mediterranean, Egypt","authors":"Ayman S. Ahmed , Ezzat Mohammed-AbdAllah","doi":"10.1016/j.ejar.2023.06.001","DOIUrl":"https://doi.org/10.1016/j.ejar.2023.06.001","url":null,"abstract":"<div>The growth and population parameters of spotted seabass (Dicentrarchus punctatus) in Bardawil Lagoon were investigated to assess their fishery status and propose concrete recommendations for sustainable exploitation. The samples (n = 271) were collected from commercial catches during 2021. As revealed by examining the otoliths, D. punctatus has a short life span of a maximum of four years based on the mean lengths of 20.2, 25.3, 29.7, and 33.5 cm for age groups from I to IV, respectively. The total length-weight relationship equations were W = 0.0120TL2.9672 for males, W = 0.0127TL2.9486 for females and W = 0.0124TL2.9563 for the combined sexes. The von Bertalanffy growth function was Lt = 40.50(1-e-0.38(t+0.66)). The study determined the total and natural mortality rates as 1.58 and 0.79 year−1, respectively, with an exploitation rate (E) of 0.49, which was found close to the optimum value (0.5). However, based on management policies, E was greater than the value corresponding to 50% relative biomass per recruit (E0.5), which indicates that the current fishing effort is unsustainable. Therefore, to maintain the biomass of spawning stocks, the study recommends a 22.4% reduction in the current exploitation rate through the application of fishing regulations that decrease fishing efforts. Such recommendations can help ensure the sustainable exploitation of spotted seabass in Bardawil Lagoon.</div>","PeriodicalId":46117,"journal":{"name":"Egyptian Journal of Aquatic Research","volume":"49 3","pages":"Pages 353-359"},"PeriodicalIF":3.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49785907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of hauling and soaking time of stationary lift nets on fish aggregation using a hydroacoustic monitoring approach 利用水声监测方法研究固定式提升网的拖运和浸泡时间对鱼类聚集的影响

IF 3.5

Egyptian Journal of Aquatic Research Pub Date : 2023-09-01 DOI: 10.1016/j.ejar.2023.05.003

Fauziyah , Ellis Nurjuliasti Ningsih , Edo Arnando , Fatimah , Fitri Agustriani , Freddy Supriyadi

{"title":"Effect of hauling and soaking time of stationary lift nets on fish aggregation using a hydroacoustic monitoring approach","authors":"Fauziyah , Ellis Nurjuliasti Ningsih , Edo Arnando , Fatimah , Fitri Agustriani , Freddy Supriyadi","doi":"10.1016/j.ejar.2023.05.003","DOIUrl":"https://doi.org/10.1016/j.ejar.2023.05.003","url":null,"abstract":"<div>This study aimed to determine the effect of hauling and soaking time of stationary lift nets on the pattern of fish aggregation in the Banyuasin waters, South Sumatra, Indonesia using a hydroacoustic monitoring approach. The fish aggregations were monitored using the SIMRAD EK-15 single beam (200 kHz) during hauling, and the transducer was mounted on the side of the fishing gear. Furthermore, data were collected before (17:00–23:59) and after midnight (24:00–05:00) at four different soaking times (S1, S2, S3, and S4). The data obtained were then analyzed using pairwise comparisons (nonparametric tests). The pairwise test (p = 0.25 > 0.05) showed that there was no significant difference between the acoustic mean densities obtained before and after midnight (292.2 and 178.9 g/m3), but the total values for both periods varied widely (6,797 and 3,507 g/m3). Dunn’s post hoc tests (p = 0.001 < 0.05) revealed that there were significant differences in the acoustic mean densities between S1 (1–16 min) and S2 (17–32 min). Based on the results, the optimum soaking time was 17–32 min, which was recommended for improving the effectiveness of the stationary lift nets. Furthermore, fish aggregation began to spread out of the catchable area when the soaking time was over 32 min.</div>","PeriodicalId":46117,"journal":{"name":"Egyptian Journal of Aquatic Research","volume":"49 3","pages":"Pages 339-346"},"PeriodicalIF":3.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49785909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The carrying capacity of estuarine mangroves in maintaining the coastal urban environmental health of Southeast Sulawesi, Indonesia 河口红树林在维护印度尼西亚苏拉威西岛东南部沿海城市环境健康方面的承载力

IF 3.5

Egyptian Journal of Aquatic Research Pub Date : 2023-09-01 DOI: 10.1016/j.ejar.2023.03.002

Kangkuso Analuddin , Alrum Armid , Ruslin Ruslin , Sahadev Sharma , La Ode Kadidae , La Ode Muhammad Yasir Haya , Andi Septiana , Saban Rahim , Richard A. McKenzie , Jumarddin La Fua

{"title":"The carrying capacity of estuarine mangroves in maintaining the coastal urban environmental health of Southeast Sulawesi, Indonesia","authors":"Kangkuso Analuddin , Alrum Armid , Ruslin Ruslin , Sahadev Sharma , La Ode Kadidae , La Ode Muhammad Yasir Haya , Andi Septiana , Saban Rahim , Richard A. McKenzie , Jumarddin La Fua","doi":"10.1016/j.ejar.2023.03.002","DOIUrl":"https://doi.org/10.1016/j.ejar.2023.03.002","url":null,"abstract":"<div>This study aims to elucidate the carrying capacity of estuarine mangroves in Southeast Sulawesi, to maintain environmental health of its coastal cities. The concentrations of mercury (Hg), Copper (Cu), Manganese (Mn), Lead (Pb), Zinc (Zn), and Nickel (Ni) were analyzed in sediments and mangrove tissues samples from Kendari bay and Tinanggea estuaries. This was followed by the determination of translocation and bioaccumulation factors, as well as the total accumulation of heavy metals on a landscape level. The results showed that the sediment in Kendari Bay had higher heavy metal concentrations than in Tinanggea, indicating the anthropogenic impact of the highly populated city of Kendari. Moreover, the roots and stems of mangroves had higher heavy metal concentrations than the leaves. Overall, the Bioconcentration Factors (BCF) of Hg, Cu, Mn, Pb and Zn metals were >1, indicating that estuarine mangroves have a higher phytoremediation capacity for heavy metals. Estuarine mangrove biomass also enables the high accumulation of heavy metals in both Kendari bay and Tinanggea, signifying the greater phytoremediation potential of urban estuarine mangroves. Based on these findings, the study supports the conservation and management of mangroves in urban estuaries to maintain the environmental health of coastal cities.</div>","PeriodicalId":46117,"journal":{"name":"Egyptian Journal of Aquatic Research","volume":"49 3","pages":"Pages 327-338"},"PeriodicalIF":3.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49785910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Chitosan of blood cockle shell (Anadara granosa) as a natural coagulant for removal of total suspended solids (TSS) and turbidity of well-water 壳聚糖（Anadara granosa）作为天然混凝剂用于去除总悬浮固体（TSS）和井水浊度

IF 3.5

Egyptian Journal of Aquatic Research Pub Date : 2023-09-01 DOI: 10.1016/j.ejar.2023.04.004

Eko Siswoyo , Rahmalina Nur Zahra , Nurul Hardina A. Mai , Awaluddin Nurmiyanto , Kazuo Umemura , Thomas Boving

{"title":"Chitosan of blood cockle shell (Anadara granosa) as a natural coagulant for removal of total suspended solids (TSS) and turbidity of well-water","authors":"Eko Siswoyo , Rahmalina Nur Zahra , Nurul Hardina A. Mai , Awaluddin Nurmiyanto , Kazuo Umemura , Thomas Boving","doi":"10.1016/j.ejar.2023.04.004","DOIUrl":"https://doi.org/10.1016/j.ejar.2023.04.004","url":null,"abstract":"<div>Blood clam or blood cockle (Anadara granosa) is a clam species with high calcium carbonate (CaCO3) and chitin content; these compounds are commonly used in coagulation water treatment. This study examined the capacity of blood cockle shells (BCS) as an innovative natural coagulant in the form of unmodified powder (BCSP) and chitosan extracted from the shells (BCSC) to reduce TSS and turbidity of well-water. SEM and FTIR analysis were conducted to analyse the characteristics of the media. The coagulant dose, pH of the water sample, and settling time were investigated using a jar test experiment to determine the optimum condition for each experimental system. Rapid mixing (1 min at 120 rpm) was followed by slow mixing (10 min at 60 rpm), followed by settling times ranging from 10 to 30 min. The optimum settling time was 30 min, after which 76% TSS and 76% turbidity were removed using 75 mg/l of BCSP at pH 4. The tests with BCSC resulted in 80% TSS and 81% turbidity removal with 200 mg/l of BCSC at pH 5 and a settling time of 30 min. The results were compared to the performance of alum (Al2(SO4)3·18H2O), a commercial chemical coagulant. Under similar dosage (200 mg/L) and pH (= 6) conditions, alum reduced turbidity and TSS by 95% and 97%, respectively. These results indicate that blood cockle shell-based coagulant is a promising environmental-friendly material that can compete and possibly replace conventional chemical coagulants in water treatment systems.</div>","PeriodicalId":46117,"journal":{"name":"Egyptian Journal of Aquatic Research","volume":"49 3","pages":"Pages 283-289"},"PeriodicalIF":3.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49785916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Gonadal growth and qualitative color assessment of the sea urchin Paracentrotus lividus Lamarck, 1816 (Echinodermata: Echinoidae) of the Southeastern Mediterranean Sea 地中海东南部海胆Paracentrtus lividus Lamarck，1816（棘皮动物门：棘皮动物科）的性腺生长和定性颜色评估

IF 3.5

Egyptian Journal of Aquatic Research Pub Date : 2023-09-01 DOI: 10.1016/j.ejar.2023.08.009

Elzahrae Elmasry , Abdel-Fattah M. El-Sayed , Fatma A. Abdelrazek

{"title":"Gonadal growth and qualitative color assessment of the sea urchin Paracentrotus lividus Lamarck, 1816 (Echinodermata: Echinoidae) of the Southeastern Mediterranean Sea","authors":"Elzahrae Elmasry , Abdel-Fattah M. El-Sayed , Fatma A. Abdelrazek","doi":"10.1016/j.ejar.2023.08.009","DOIUrl":"https://doi.org/10.1016/j.ejar.2023.08.009","url":null,"abstract":"<div>This study aims to investigate the gonadal growth and gonads qualitative color assessment of the sea urchin Paracentrotus lividus in the Southeastern (SE) Mediterranean coast off Egypt. A total of 1895 sea urchins were collected between 2017 and 2018, and their reproductive biology parameters were determined. The gonadosomatic index with the histological analysis revealed that P. lividus has two spawning seasons (spring – autumn). Females and males have four maturity stages; recovery, growing, mature, and spent. Mature oocytes and sperms were observed during autumn, winter, and spring, while nutritive phagocytes dominated the tissue of both ovaries and testes in the summer season. The sex ratio (F: M) was male-biased (1: 1.2). The smallest observed size of mature males was 19.10 mm TD (test diameter), whereas the calculated L50 was 26.2 mm. In females, the smallest observed size of a mature individual was 22.70 mm TD, and the calculated L50 was 33.5 mm TD. The qualitative color assessment of the gonads revealed the dominance of excellent and acceptable color throughout the year (83.93%), with maximum value during the resting and recovery periods, while, the occurrence of unacceptable color was linked to the maturation and spawning periods. The present findings would assist the decision makers to propose management strategies and regulations on the harvesting of P. lividus off the Egyptian Mediterranean coast.</div>","PeriodicalId":46117,"journal":{"name":"Egyptian Journal of Aquatic Research","volume":"49 3","pages":"Pages 369-378"},"PeriodicalIF":3.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49811611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of brown algae Padina pavonica as a dietary supplement on growth performance and health status of cultured Oreochromis niloticus 褐藻Padina pavonica对尼罗罗非鱼生长性能和健康状况的影响

IF 3.5

Egyptian Journal of Aquatic Research Pub Date : 2023-09-01 DOI: 10.1016/j.ejar.2023.03.001

Asmaa Maghawri , Samar S. Marzouk , Heba M. Ezz El-Din , Mai Nashaat

{"title":"Effect of brown algae Padina pavonica as a dietary supplement on growth performance and health status of cultured Oreochromis niloticus","authors":"Asmaa Maghawri , Samar S. Marzouk , Heba M. Ezz El-Din , Mai Nashaat","doi":"10.1016/j.ejar.2023.03.001","DOIUrl":"https://doi.org/10.1016/j.ejar.2023.03.001","url":null,"abstract":"<div>Growth rates and health status of fish have been positively affected by adding dietary brown algae Padina pavonica as a meal. The present study aims to investigate the effects of P. pavonica on growth performance, hematology, biochemistry, and kidney and liver status of Nile tilapia (Oreochromis niloticus). The diets of Nile tilapia, with an initial weight of 4.58 ± 0.03 g, were enriched with 2.0, 4.0, 6.0 and 8.0 g/kg of P. pavonica concentrations for 45 days. This study was performed under two different conditions, i.e., experimental environment (A) and farming environment (B). At the end of the trial, the parameters of growth performance showed a significant difference between groups in experimental environment. However, they showed no significant difference in farming environment. The highest growth recorded with higher concentrations of P. pavonica diets (8.0 g/kg) as compared to their control in farming environment. In terms of hematological and biochemical parameters, this study revealed that there were highly significant differences (p ≤ 0.05) between the treated and control groups, with higher concentrations of algal meals (8.0 g/kg), in both farming and experimental environments.</div>","PeriodicalId":46117,"journal":{"name":"Egyptian Journal of Aquatic Research","volume":"49 3","pages":"Pages 379-385"},"PeriodicalIF":3.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49811610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1