Stanisław Cukier, Rafał Rączka, Maciej Kamaszewski
Large branchiopods is a group of poorly understood crustaceans which is highly threatened by the impact of human activities. Currently, their protection is difficult due to large deficiencies in documentation of their places of occurrence and not well researched ecology. After rediscovery of Streptocephalus torvicornis in Poland by Cukier in 2019, we conducted a survey to identify the species found at the Łąki Jaktorowskie Fisheries Research Station, Poland. This study consisted of observations and measurements of animals reared from cysts which had been obtained from soil samples taken at the nursery ponds in the study area. The following species were found: Limnadia lenticularis, Triops cancriformis, and S. torvicornis. We are presenting results of the morphometric measurements of T. cancriformis and the morphometric measurements of S. torvicornis from their only known population in Poland. Males were found in the T. cancriformis population, contrary to what has been documented previously. Large branchiopods have been repeatedly found in fishponds, and this work confirms the potentially high importance of ponds in the conservation of large branchiopods. With this study, we are drawing attention to the necessity of research about the distribution of large branchiopods in Poland.
{"title":"Large branchiopods in extensive carp ponds – morphometric analysis of Triops cancriformis (Bosc, 1801) and Streptocephalus torvicornis (Waga, 1842)","authors":"Stanisław Cukier, Rafał Rączka, Maciej Kamaszewski","doi":"10.26881/oahs-2023.3.10","DOIUrl":"https://doi.org/10.26881/oahs-2023.3.10","url":null,"abstract":"Large branchiopods is a group of poorly understood crustaceans which is highly threatened by the impact of human activities. Currently, their protection is difficult due to large deficiencies in documentation of their places of occurrence and not well researched ecology. After rediscovery of Streptocephalus torvicornis in Poland by Cukier in 2019, we conducted a survey to identify the species found at the Łąki Jaktorowskie Fisheries Research Station, Poland. This study consisted of observations and measurements of animals reared from cysts which had been obtained from soil samples taken at the nursery ponds in the study area. The following species were found: Limnadia lenticularis, Triops cancriformis, and S. torvicornis. We are presenting results of the morphometric measurements of T. cancriformis and the morphometric measurements of S. torvicornis from their only known population in Poland. Males were found in the T. cancriformis population, contrary to what has been documented previously. Large branchiopods have been repeatedly found in fishponds, and this work confirms the potentially high importance of ponds in the conservation of large branchiopods. With this study, we are drawing attention to the necessity of research about the distribution of large branchiopods in Poland.","PeriodicalId":19407,"journal":{"name":"Oceanological and Hydrobiological Studies","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135295923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Biodiversity in the Mediterranean Sea has not yet been fully explored. There has been very little research on molluscs along the Libyan coast. An individual of the chromodoridid nudibranch Felimare picta (Philippi, 1836) was encountered during scuba diving at the Lido resort near the Tobruk bay basin. The sample was carefully transported to the lab in seawater, photographed, and identified. The current study revealed that Felimare picta was recorded for the first time on the Libyan coast. Despite Felimare picta being rather common in many Mediterranean regions, records of it on the southern Mediterranean coasts are extremely rare or absent. It may be concluded that this study represents not only the southernmost record of Felimare picta in the Mediterranean but also the first record of the species in Libya.
{"title":"First record of Felimare picta (Philippi, 1836) (Mollusca, Gastropoda, Chromodorididae) from Tobruk, Libyan coast","authors":"R. E. Said, Amani Fitori, Ali Fituri, A. Mahdy","doi":"10.26881/oahs-2023.2.10","DOIUrl":"https://doi.org/10.26881/oahs-2023.2.10","url":null,"abstract":"Abstract Biodiversity in the Mediterranean Sea has not yet been fully explored. There has been very little research on molluscs along the Libyan coast. An individual of the chromodoridid nudibranch Felimare picta (Philippi, 1836) was encountered during scuba diving at the Lido resort near the Tobruk bay basin. The sample was carefully transported to the lab in seawater, photographed, and identified. The current study revealed that Felimare picta was recorded for the first time on the Libyan coast. Despite Felimare picta being rather common in many Mediterranean regions, records of it on the southern Mediterranean coasts are extremely rare or absent. It may be concluded that this study represents not only the southernmost record of Felimare picta in the Mediterranean but also the first record of the species in Libya.","PeriodicalId":19407,"journal":{"name":"Oceanological and Hydrobiological Studies","volume":"52 1","pages":"258 - 263"},"PeriodicalIF":0.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42387230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Jawad, J. Abed, A. Resen, R. Al-Yassein, Ali M. Kulw
Abstract A new record of Siganus sutor from inland artificial marine extension Shatt al-Basrah canal, south of Iraq, is reported. Two specimens were collected during an ichthyologic survey on 2 November 2021. The specimens are 127 and 129 mm in total length. This record from Iraqi waters represents the species’ second and northernmost appearance in the northern Indian Ocean.
{"title":"The shoemaker spinefoot Siganus sutor (Valenciennes, 1835) in the marine waters of Iraq: second appearance and the northernmost record in the northern Indian Ocean","authors":"L. Jawad, J. Abed, A. Resen, R. Al-Yassein, Ali M. Kulw","doi":"10.26881/oahs-2023.2.03","DOIUrl":"https://doi.org/10.26881/oahs-2023.2.03","url":null,"abstract":"Abstract A new record of Siganus sutor from inland artificial marine extension Shatt al-Basrah canal, south of Iraq, is reported. Two specimens were collected during an ichthyologic survey on 2 November 2021. The specimens are 127 and 129 mm in total length. This record from Iraqi waters represents the species’ second and northernmost appearance in the northern Indian Ocean.","PeriodicalId":19407,"journal":{"name":"Oceanological and Hydrobiological Studies","volume":"52 1","pages":"166 - 171"},"PeriodicalIF":0.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48923510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Samadhan Pardhi, T. Kokila, Mital Thacker, B. Alakananda, B. Karthick
Abstract The present study is a preliminary taxonomic survey of diatom assemblages from one of the highest mountain ranges in the Western Himalayas – Ladakh. 37 samples were collected from 19 different sampling sites at altitudes ranging from 3100–4552 amsl. The diatom communities were representative of habitats such as lakes, streams, and hot springs from high altitudes. The dominant diatoms are studied using light microscopy and identified using valve morphometrics. The study enlists a total of 74 taxa belonging to 40 genera along with photomicrographic plates. Commonly-found species of high-altitude hot springs habitats were Gogorevia exilis and Denticula thermaloides. Reimeria sinuata, Fragilaria vaucheriae, Gomphonella cf. olivacea, Encyonema ventricosum, Lindavia biswashanti, Diatoma moniliformis, and Denticula valida were commonly occurring species in stream, river and lake habitats. Further analysis and putative novel species from this high-altitude environment will be described in future publications.
{"title":"Diatoms (Bacillariophyta) of the world’s highest aquatic environments from the Western Himalayas, India","authors":"Samadhan Pardhi, T. Kokila, Mital Thacker, B. Alakananda, B. Karthick","doi":"10.26881/oahs-2023.2.04","DOIUrl":"https://doi.org/10.26881/oahs-2023.2.04","url":null,"abstract":"Abstract The present study is a preliminary taxonomic survey of diatom assemblages from one of the highest mountain ranges in the Western Himalayas – Ladakh. 37 samples were collected from 19 different sampling sites at altitudes ranging from 3100–4552 amsl. The diatom communities were representative of habitats such as lakes, streams, and hot springs from high altitudes. The dominant diatoms are studied using light microscopy and identified using valve morphometrics. The study enlists a total of 74 taxa belonging to 40 genera along with photomicrographic plates. Commonly-found species of high-altitude hot springs habitats were Gogorevia exilis and Denticula thermaloides. Reimeria sinuata, Fragilaria vaucheriae, Gomphonella cf. olivacea, Encyonema ventricosum, Lindavia biswashanti, Diatoma moniliformis, and Denticula valida were commonly occurring species in stream, river and lake habitats. Further analysis and putative novel species from this high-altitude environment will be described in future publications.","PeriodicalId":19407,"journal":{"name":"Oceanological and Hydrobiological Studies","volume":"52 1","pages":"172 - 205"},"PeriodicalIF":0.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42368614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Türkeri, Suat Marankoz, Özgur Özbay, Ismail Akçay, M. Alp
Abstract In this study, dissolved nutrients concentrations were measured monthly at downstream points of the two regional rivers (the Berdan and Göksu rivers) flowing into the Cilician Basin of the North-eastern (NE) Mediterranean Sea. The dissolved nutrients data obtained between September 2021 and August 2022 were used to determine riverine nutrient fluxes. This study showed that spatial and temporal variations were recorded in nutrients concentrations of the two regional rivers with the maximum values consistently recorded in the Berdan River having lower volume fluxes. The annual nutrient inputs of the two regional rivers indicated that higher amounts of dissolved nutrients were carried by the Göksu River due to its higher volume flux rate. The calculated molar ratios from total nitrogen (TN) and phosphorus (TP) fluxes ranged from 13 in the Göksu River to 22 in the Berdan River. The higher TN/TP molar ratio compared to the classic Redfield Ratio of N/P in the Berdan River is very likely to modify nutrient dynamics leading to further eutrophication in the shelf waters of the NE Mediterranean Sea.
{"title":"Nutrient inputs from two major rivers into the cilician basin of the north-eastern Mediterranean Sea","authors":"M. Türkeri, Suat Marankoz, Özgur Özbay, Ismail Akçay, M. Alp","doi":"10.26881/oahs-2023.2.08","DOIUrl":"https://doi.org/10.26881/oahs-2023.2.08","url":null,"abstract":"Abstract In this study, dissolved nutrients concentrations were measured monthly at downstream points of the two regional rivers (the Berdan and Göksu rivers) flowing into the Cilician Basin of the North-eastern (NE) Mediterranean Sea. The dissolved nutrients data obtained between September 2021 and August 2022 were used to determine riverine nutrient fluxes. This study showed that spatial and temporal variations were recorded in nutrients concentrations of the two regional rivers with the maximum values consistently recorded in the Berdan River having lower volume fluxes. The annual nutrient inputs of the two regional rivers indicated that higher amounts of dissolved nutrients were carried by the Göksu River due to its higher volume flux rate. The calculated molar ratios from total nitrogen (TN) and phosphorus (TP) fluxes ranged from 13 in the Göksu River to 22 in the Berdan River. The higher TN/TP molar ratio compared to the classic Redfield Ratio of N/P in the Berdan River is very likely to modify nutrient dynamics leading to further eutrophication in the shelf waters of the NE Mediterranean Sea.","PeriodicalId":19407,"journal":{"name":"Oceanological and Hydrobiological Studies","volume":"52 1","pages":"240 - 244"},"PeriodicalIF":0.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43487904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract International food and raw material security issues has gained much more importance than ever. This study examines that the following questions ‘Who depends on whom?’ and ‘What is the level of dependency?’ considering relationships between “fisheries context” (catch and aquaculture production, total fisheries export and import, fisheries export and import value, fish consumption per capita, and processed fisheries product) and human development of countries (as Human Development Index-HDI). The overall result of the study pointed that the countries located in the highest categories in terms of HDI were both export and import-dependent. The most importance levels of dependency for the Low Developed Countries (HDI < 0.550) were fish consumption, and total imports; for Medium Developed Countries (0.550 ≤ HDI < 0.699) were export value, exports, and catch production; for High Developed Countries (0.699 ≤ HDI <0.80) was total exports; for Very High Developed Countries-I (0.80 ≤ HDI < 0.900) was exports; and for Very High Developed Countries-II (HDI ≥ 0.90) was import value. To improve the human development of the countries and maintain the food security around the world, the following points could be suggested: i) to increase the aquaculture production both in inland and marine environments where possible, ii) for low and medium developed countries, instead of raw material exporting, to support increasing the production capacity of processed fisheries products that have higher global market prices.
{"title":"Is there a relationship between human development and dependence on fisheries?","authors":"M. Can, Y. Mazlum, B. Erkan","doi":"10.26881/oahs-2023.2.09","DOIUrl":"https://doi.org/10.26881/oahs-2023.2.09","url":null,"abstract":"Abstract International food and raw material security issues has gained much more importance than ever. This study examines that the following questions ‘Who depends on whom?’ and ‘What is the level of dependency?’ considering relationships between “fisheries context” (catch and aquaculture production, total fisheries export and import, fisheries export and import value, fish consumption per capita, and processed fisheries product) and human development of countries (as Human Development Index-HDI). The overall result of the study pointed that the countries located in the highest categories in terms of HDI were both export and import-dependent. The most importance levels of dependency for the Low Developed Countries (HDI < 0.550) were fish consumption, and total imports; for Medium Developed Countries (0.550 ≤ HDI < 0.699) were export value, exports, and catch production; for High Developed Countries (0.699 ≤ HDI <0.80) was total exports; for Very High Developed Countries-I (0.80 ≤ HDI < 0.900) was exports; and for Very High Developed Countries-II (HDI ≥ 0.90) was import value. To improve the human development of the countries and maintain the food security around the world, the following points could be suggested: i) to increase the aquaculture production both in inland and marine environments where possible, ii) for low and medium developed countries, instead of raw material exporting, to support increasing the production capacity of processed fisheries products that have higher global market prices.","PeriodicalId":19407,"journal":{"name":"Oceanological and Hydrobiological Studies","volume":"52 1","pages":"245 - 257"},"PeriodicalIF":0.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49497556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Ö. A. Aydoğdu, Mert Kesiktaş, N. O. Sanli, N. D. Güngör, Serap Sancar, T. Yıldız, E. Yemişken
Abstract Skates and rays, which are widely encountered in the by-catch of fisheries activities from the Sea of Marmara and banned for sale by regulation, are species that are discarded if caught. For this reason, in our study, we aimed to determine the bioactive potentials of these species, considered fishing waste, by investigating the skin secretions and microbial flora. In our study, both the skin flora and mucus contents of the discarded species Dasyatis pastinaca (Linnaeus, 1758), Myliobatis aquila (Linnaeus, 1758), and Raja clavata (Linnaeus, 1758) caught in the Sea of Marmara were investigated to determine their potential antimicrobial activities. A total of 164 bacteria were isolated from the epidermal mucus of the three batoid species. Antibacterial activity was observed from three isolated bacteria against Escherichia coli, Vancomycin-resistant Enterococcus faecium, E. faecalis, and Bacillus subtilis. Additionally, the highest antibacterial activity was observed for skin mucus of R. clavata. Mouse fibroblast cell viability was challenged with mucus secretions. M. aquila and R. clavata mucus secretions exhibited no observable change after 24 and 48 hours. The assays indicated that both the isolates and the skin mucus have potential antimicrobial activity against opportunistic pathogens.
{"title":"Preliminary study on antimicrobial activities of skin mucus from by-catch of Elasmobranch species","authors":"E. Ö. A. Aydoğdu, Mert Kesiktaş, N. O. Sanli, N. D. Güngör, Serap Sancar, T. Yıldız, E. Yemişken","doi":"10.26881/oahs-2023.2.01","DOIUrl":"https://doi.org/10.26881/oahs-2023.2.01","url":null,"abstract":"Abstract Skates and rays, which are widely encountered in the by-catch of fisheries activities from the Sea of Marmara and banned for sale by regulation, are species that are discarded if caught. For this reason, in our study, we aimed to determine the bioactive potentials of these species, considered fishing waste, by investigating the skin secretions and microbial flora. In our study, both the skin flora and mucus contents of the discarded species Dasyatis pastinaca (Linnaeus, 1758), Myliobatis aquila (Linnaeus, 1758), and Raja clavata (Linnaeus, 1758) caught in the Sea of Marmara were investigated to determine their potential antimicrobial activities. A total of 164 bacteria were isolated from the epidermal mucus of the three batoid species. Antibacterial activity was observed from three isolated bacteria against Escherichia coli, Vancomycin-resistant Enterococcus faecium, E. faecalis, and Bacillus subtilis. Additionally, the highest antibacterial activity was observed for skin mucus of R. clavata. Mouse fibroblast cell viability was challenged with mucus secretions. M. aquila and R. clavata mucus secretions exhibited no observable change after 24 and 48 hours. The assays indicated that both the isolates and the skin mucus have potential antimicrobial activity against opportunistic pathogens.","PeriodicalId":19407,"journal":{"name":"Oceanological and Hydrobiological Studies","volume":"52 1","pages":"137 - 146"},"PeriodicalIF":0.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44635058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract One hundred and twenty asterisci were obtained from 30 specimens each of Cyprinion kais and Cyprinion macrostomum. Significant relationships between otolith mass and the three fish lengths (TL, SL, and FL) were attained for C. kais. Similar associations were obtained for OL and the three fish lengths of C. macrostomum. For C. kais, the highest in the relation between otolith mass, hereafter referred to as OM, and fish fork length, henceforth known as FL (0.5894). The lowest coefficient of determination was observed between otolith width, hereafter called OW, and standard fish length, hereafter referred to as SL (0.2861). For C. macrostomum, the highest coefficient of determination was attained for the relation between OL and FL (0.7280) and the lowest for the relationship between OM and TL (0.1717). The analysis shows that evaluations of the body size of the two fish species investigated through biometric studies of otoliths are trustworthy.
{"title":"Biometric relation between body size and otolith size of Cyprinion kais and C. macrostomum collected from Tigris River, Şirnak Province, Türkiye","authors":"M. Y. Dörtbudak, L. Jawad, H. Yalçın, J. Park","doi":"10.26881/oahs-2023.2.06","DOIUrl":"https://doi.org/10.26881/oahs-2023.2.06","url":null,"abstract":"Abstract One hundred and twenty asterisci were obtained from 30 specimens each of Cyprinion kais and Cyprinion macrostomum. Significant relationships between otolith mass and the three fish lengths (TL, SL, and FL) were attained for C. kais. Similar associations were obtained for OL and the three fish lengths of C. macrostomum. For C. kais, the highest in the relation between otolith mass, hereafter referred to as OM, and fish fork length, henceforth known as FL (0.5894). The lowest coefficient of determination was observed between otolith width, hereafter called OW, and standard fish length, hereafter referred to as SL (0.2861). For C. macrostomum, the highest coefficient of determination was attained for the relation between OL and FL (0.7280) and the lowest for the relationship between OM and TL (0.1717). The analysis shows that evaluations of the body size of the two fish species investigated through biometric studies of otoliths are trustworthy.","PeriodicalId":19407,"journal":{"name":"Oceanological and Hydrobiological Studies","volume":"52 1","pages":"221 - 227"},"PeriodicalIF":0.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46935066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Manzala Lake, the largest in Egypt’s Nile Delta, has significant human activity. The Lake’s ecological condition has recently been impacted by a significant increase in agricultural, industrial, and urban wastewater discharge. A valuable tool for monitoring the water quality of Manzala Lake is the sensitivity of invertebrate species to various types of pollution, such as radioactive contamination. Activity concentrations of radionuclides Radium-226 (226Ra), Thorium-232 (232Th), Potassium-40 (40K), and Caesium-137 (137Cs) were measured in water, sediments and benthic invertebrate samples in 2020. The benthic community’s spatial distribution and the radionuclides’ bioaccumulation were evaluated to determine possible relationships. Thirty taxa of benthic invertebrates were recognised. The data illustrated that the mean activity concentration of radionuclides in water was in the order of 40K > 232Th > 226Ra > 137Cs, which changed into 40K > 226Ra > 232Th > 137Cs in the sediment and benthic invertebrates. Gastropoda and Ostracoda are the dominating groups of benthos in the lake and are related to the highest concentrations of radionuclides. The benthos species with shells dominated at the sites with the highest activity concentration of 226Ra, while soft-bodied organisms dominated in sites with the highest average 137Cs activity in these samples.
{"title":"Biomonitoring of radioactive contamination using benthic invertebrate communities in Manzala Lake, Egypt","authors":"N. Imam, R. Bendary","doi":"10.26881/oahs-2023.2.02","DOIUrl":"https://doi.org/10.26881/oahs-2023.2.02","url":null,"abstract":"Abstract Manzala Lake, the largest in Egypt’s Nile Delta, has significant human activity. The Lake’s ecological condition has recently been impacted by a significant increase in agricultural, industrial, and urban wastewater discharge. A valuable tool for monitoring the water quality of Manzala Lake is the sensitivity of invertebrate species to various types of pollution, such as radioactive contamination. Activity concentrations of radionuclides Radium-226 (226Ra), Thorium-232 (232Th), Potassium-40 (40K), and Caesium-137 (137Cs) were measured in water, sediments and benthic invertebrate samples in 2020. The benthic community’s spatial distribution and the radionuclides’ bioaccumulation were evaluated to determine possible relationships. Thirty taxa of benthic invertebrates were recognised. The data illustrated that the mean activity concentration of radionuclides in water was in the order of 40K > 232Th > 226Ra > 137Cs, which changed into 40K > 226Ra > 232Th > 137Cs in the sediment and benthic invertebrates. Gastropoda and Ostracoda are the dominating groups of benthos in the lake and are related to the highest concentrations of radionuclides. The benthos species with shells dominated at the sites with the highest activity concentration of 226Ra, while soft-bodied organisms dominated in sites with the highest average 137Cs activity in these samples.","PeriodicalId":19407,"journal":{"name":"Oceanological and Hydrobiological Studies","volume":"52 1","pages":"147 - 165"},"PeriodicalIF":0.9,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69157286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Atamanalp, M. Kırıcı, Mine Köktürk, M. Kırıcı, D. Alwazeer, E. Kocaman, A. Uçar, Veysel Parlak, Sinan Özcan, G. Alak
Abstract Although the number of studies documenting the presence of Microplastics (MP) in fish is increasing, research studies focused on its detoxification are very limited. In this study, rainbow trout (Oncorhyncus mykiss) were randomly divided into two groups after being fed with MPs (15% polypropylene [PP] +15% polyethylene [PE]) for 2 months. MP excretion without any application (PP+PE) in group I fish, and excretion of MPs with hydrogen-rich water (HRW) application (PP+PE+HRW) in group 2 were investigated under semi-static conditions for 21 days. This effect was also compared by using positive and negative control groups (Control [no treatment, free PP, PE or/and HRW] and only HRW group). In this direction, the following were determined: PP+PE chronic toxicity in aquatic organisms, the toxicity mechanism and the effect of HRW as a possible treatment method in blood tissue; with hematological indices ([RBC count [RBC], leukocyte count [WBC], hemoglobin value [Hb], hematocrit ratio [Hct], platelet count [PLT], hemoglobin count per erythrocyte [MCHC], mean hemoglobin amount per erythrocyte [MCH] and mean erythrocyte volume [MCV]) in other tissues (liver, gill and brain tissue) oxidative stress response (catalase [CAT]), glutathione peroxidase (GPx), glutathione reductase (GR), superoxide dismutase (SOD), glutathione (GSH), reactive oxygen products (ROS), malondialdehyde ([MDA] levels), DNA damage (8-OHdG: 8-Hydroxy-2-Deoxyguanosine), and the apoptosis (caspase 3) levels were investigated. In addition, acetylcholinesterase enzyme (AChE) activity, which is important in neurotoxicity pathways in the brain, was determined. The presence of plastics (PP/PE) in target tissues (muscle, liver, gill and gastrointestinal tract) was also obtained. The results showed that PP+PE caused toxicity in all three tissues. MPs showed an inhibiting effect on antioxidant enzyme activities and an inductive effect on MDA, ROS, 8-OHdG, and caspase 3 levels. HRW showed a mitigating effect on MP-mediated toxicity in O. mykiss brain, blood, gill, and liver by controlling the ROS/GSH/MDA pathway. HRW can be suggested as a costeffective and eco-friendly curative for the protection of fish from the oxidative damages produced by the ingestion of microplastics.
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