In the present study, length–weight relationships (LWRs) were estimated for three deep sea fish species, namely, Nettastoma melanura Rafinesque, 1810; Lampanyctus crocodilus (Risso, 1810); and Chauliodus sloani Bloch & Schneider, 1801 in the north-eastern Mediterranean Sea. A total of 102 fish samples were collected from Mersin Bay (Erdemli coast). Their length–weight relationship b values ranged between 2.458 and 3.496, and all regressions were found to be significant for all three species (p<0.001). This study is the first reference on length–weight relationships for these three deep-sea fish species from the North-eastern Mediterranean Sea coast of Turkey. Besides, Length–weight relationships for C. sloani and L. crocodilus were not yet available in Fishbase for the Eastern Mediterranean, and hence these results obtained from this study will be useful to researchers and fisheries biologists in the field.
{"title":"Length-Weight Relationships for Three Deep Sea Fish Species in North Eastern Mediterranean, Turkey","authors":"Yusuf Kenan, S. Ergüden, D. Ergüden","doi":"10.26650/ase2020683520","DOIUrl":"https://doi.org/10.26650/ase2020683520","url":null,"abstract":"In the present study, length–weight relationships (LWRs) were estimated for three deep sea fish species, namely, Nettastoma melanura Rafinesque, 1810; Lampanyctus crocodilus (Risso, 1810); and Chauliodus sloani Bloch & Schneider, 1801 in the north-eastern Mediterranean Sea. A total of 102 fish samples were collected from Mersin Bay (Erdemli coast). Their length–weight relationship b values ranged between 2.458 and 3.496, and all regressions were found to be significant for all three species (p<0.001). This study is the first reference on length–weight relationships for these three deep-sea fish species from the North-eastern Mediterranean Sea coast of Turkey. Besides, Length–weight relationships for C. sloani and L. crocodilus were not yet available in Fishbase for the Eastern Mediterranean, and hence these results obtained from this study will be useful to researchers and fisheries biologists in the field.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42663989","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}
In this study, a total of 1283 samples of five fish species belonging to two families, Cyprinidae and Leuciscidae, were collected from the Lower Sakarya River between June 2017 and May 2018 in order to determine some growth parameters.The samples were collected monthly with trammel net, fykenets, and electro shocker. The age of the fish was determined from the scales. The von Bertalanffy's growth model was calculated Lt = 92.18(1-e-0.054(t+0.040)) for A. brama, Lt = 69.40(1-e-0.040(t+0.030)) for B. bjoerkna, Lt = 51.09(1-e-0.114(t+0.024)) for C. gibelio, Lt = 48.11(1-e-0.088(t+0.023)) for R. rutilus and Lt = 41.74(1-e-0.104(t+0.035)) for V. vimba. The phi-prime growth performance index (Φ') value was computed as 2.628, 2.268, 2.474, 2.307 and 2.260 for A. brama, B. bjoerkna, C. gibelio, R. rutilus and V. vimba, respectively. This study provides basic information on some growth parameters of five fish species living in the Lower Sakarya River. The results of this study are useful for fishery managements and stock assessment in the Sakarya River.
{"title":"Some Growth Parameters of Five Fish Species in the Lower Sakarya River, Turkey","authors":"İsmail Reis, Hasan Cerim, C. Ateş","doi":"10.26650/ase2020650992","DOIUrl":"https://doi.org/10.26650/ase2020650992","url":null,"abstract":"In this study, a total of 1283 samples of five fish species belonging to two families, Cyprinidae and Leuciscidae, were collected from the Lower Sakarya River between June 2017 and May 2018 in order to determine some growth parameters.The samples were collected monthly with trammel net, fykenets, and electro shocker. The age of the fish was determined from the scales. The von Bertalanffy's growth model was calculated Lt = 92.18(1-e-0.054(t+0.040)) for A. brama, Lt = 69.40(1-e-0.040(t+0.030)) for B. bjoerkna, Lt = 51.09(1-e-0.114(t+0.024)) for C. gibelio, Lt = 48.11(1-e-0.088(t+0.023)) for R. rutilus and Lt = 41.74(1-e-0.104(t+0.035)) for V. vimba. The phi-prime growth performance index (Φ') value was computed as 2.628, 2.268, 2.474, 2.307 and 2.260 for A. brama, B. bjoerkna, C. gibelio, R. rutilus and V. vimba, respectively. This study provides basic information on some growth parameters of five fish species living in the Lower Sakarya River. The results of this study are useful for fishery managements and stock assessment in the Sakarya River.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43197990","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}
E. Özbayram, Latife Köker, R. Akçaalan, O. Ince, Meriç Albay
Microbial community compositions and functions of freshwater ecosystems vary due to the environmental parameters and water chemistry. Transient bloom events play a crucial role on the community profiles. In this study, a specific focus was set to provide a snapshot of the bacterial community composition in Lake Sapanca, associated with cyanobacterial bloom by high throughput sequencing method. For this purpose, a sample was collected in the shore of Lake Sapanca during a cyanobacterial bloom, and the bacterial community profile was examined by 16S rRNA amplicon sequencing using the Illumina MiSeq platform. Cyanobacteria represented 94% of the all reads. The bacterial community was re-calculated to evaluate the bacterial diversity in detail by filtering cyanobacterial sequences. The community was dominated by Proteobacteria (44%) and Bacteroidetes (33%) species which are abundant in freshwater ecosystems having an ability to degrade complex organics. Among the classified genera, Flavobacterium and Rheinheimera dominated the bacterial community suggesting a strong link between those species and the cyanobacterial bloom. The experimental work presented here provides one of the first investigations of total bacterial communities in Lake Sapanca by the high throughput sequencing method. Further work is needed with more sampling points and time series to fully understand the bacterial diversity and dynamics.
{"title":"Bacterial Community Composition of Sapanca Lake During a Cyanobacterial Bloom","authors":"E. Özbayram, Latife Köker, R. Akçaalan, O. Ince, Meriç Albay","doi":"10.26650/ase2020652073","DOIUrl":"https://doi.org/10.26650/ase2020652073","url":null,"abstract":"Microbial community compositions and functions of freshwater ecosystems vary due to the environmental parameters and water chemistry. Transient bloom events play a crucial role on the community profiles. In this study, a specific focus was set to provide a snapshot of the bacterial community composition in Lake Sapanca, associated with cyanobacterial bloom by high throughput sequencing method. For this purpose, a sample was collected in the shore of Lake Sapanca during a cyanobacterial bloom, and the bacterial community profile was examined by 16S rRNA amplicon sequencing using the Illumina MiSeq platform. Cyanobacteria represented 94% of the all reads. The bacterial community was re-calculated to evaluate the bacterial diversity in detail by filtering cyanobacterial sequences. The community was dominated by Proteobacteria (44%) and Bacteroidetes (33%) species which are abundant in freshwater ecosystems having an ability to degrade complex organics. Among the classified genera, Flavobacterium and Rheinheimera dominated the bacterial community suggesting a strong link between those species and the cyanobacterial bloom. The experimental work presented here provides one of the first investigations of total bacterial communities in Lake Sapanca by the high throughput sequencing method. Further work is needed with more sampling points and time series to fully understand the bacterial diversity and dynamics.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69058335","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}
Plastic pollution in marine ecosystems is one of the most important study topics in recent years. The toxicity, mobility and long-term persistence characteristics of plastics create risk in ecosystems, biota and human health. In this study, the levels of heterotrophic bacteria attached to the surfaces of commonly used plastic types; polyvinylchloride (PVC), polyethylene (PE), and polypropylene (PP) were tested in a mechanical experimental system prepared with seawater under controlled conditions in laboratory. The seawater, which was used in the experimental system, was taken under aseptic conditions from the Golden Horn Estuary, located in the Istanbul region of Turkey. Three different types of plastic (PVC, PE and PP), in two different (glass slide (76x26 cm) and virgin micro pellets (5mm diameter) size, were placed in the experiment setup filled with seawater and incubated for 28 days at ambient temperature. At the end of 28 days, the counts of heterotrophic bacteria were tested using the spread plate technique on Marine Agar (Difco), in both plastic surfaces and surrounding seawater. The levels of heterotrophic bacteria were recorded to be lower in the seawater surrounding the micropellets and lam-size plastic samples. The seawater sample bacterial levels were recorded as 12x109 CFU/ml, at the start of the experiment. At the end of the 28th days, it was recorded to be 83x109 CFU/ml. The highest levels of heterotrophic bacteria were recorded as 41x1010 CFU /cm-2 and 61x1010 CFU /cm-2 on the lam-size surfaces and the micropellet surface of the polypropylene samples, respectively. In the experiments, the PP plastic type has been recorded as a more preferred plastic derivative by heterotrophic bacteria according to the PVC and PE plastic types, but there has been no significant difference in the bacterial adhesion rates on the surfaces. The study contributed increasing knowledge on the bacterial approach to microplastics types. However, there is a need for long term studies related to the mechanism of bacteria attached to microplastics.
{"title":"The Levels of Plastic-associated Heterotrophic Bacteria on Three Different Types of Plastics","authors":"P. S. Çiftçi Türetken, G. Altuğ, Turgay Öksüzoğlu","doi":"10.26650/ase2020580505","DOIUrl":"https://doi.org/10.26650/ase2020580505","url":null,"abstract":"Plastic pollution in marine ecosystems is one of the most important study topics in recent years. The toxicity, mobility and long-term persistence characteristics of plastics create risk in ecosystems, biota and human health. In this study, the levels of heterotrophic bacteria attached to the surfaces of commonly used plastic types; polyvinylchloride (PVC), polyethylene (PE), and polypropylene (PP) were tested in a mechanical experimental system prepared with seawater under controlled conditions in laboratory. The seawater, which was used in the experimental system, was taken under aseptic conditions from the Golden Horn Estuary, located in the Istanbul region of Turkey. Three different types of plastic (PVC, PE and PP), in two different (glass slide (76x26 cm) and virgin micro pellets (5mm diameter) size, were placed in the experiment setup filled with seawater and incubated for 28 days at ambient temperature. At the end of 28 days, the counts of heterotrophic bacteria were tested using the spread plate technique on Marine Agar (Difco), in both plastic surfaces and surrounding seawater. The levels of heterotrophic bacteria were recorded to be lower in the seawater surrounding the micropellets and lam-size plastic samples. The seawater sample bacterial levels were recorded as 12x109 CFU/ml, at the start of the experiment. At the end of the 28th days, it was recorded to be 83x109 CFU/ml. The highest levels of heterotrophic bacteria were recorded as 41x1010 CFU /cm-2 and 61x1010 CFU /cm-2 on the lam-size surfaces and the micropellet surface of the polypropylene samples, respectively. In the experiments, the PP plastic type has been recorded as a more preferred plastic derivative by heterotrophic bacteria according to the PVC and PE plastic types, but there has been no significant difference in the bacterial adhesion rates on the surfaces. The study contributed increasing knowledge on the bacterial approach to microplastics types. However, there is a need for long term studies related to the mechanism of bacteria attached to microplastics.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43421225","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}
Alburnus carinatus Battalgil, 1941 is an endangered fish species, which has a narrow distribution range in two shallow lake basins in northwest Anatolia. The present study aimed to describe the reproductive potential of this endemic fish with the relationships between body size, weight, and fecundity. A total of 101 female A. carinatus were captured from the Manyas Lake between January and June 2019. The standard length and body weight of these samples varied between 8.1– 15.0 cm and 9.38–65.45 g, respectively. The length-weight relationship of the female A. carinatus was calculated as W = 0.020 × SL2.959 (r2 = 0.866) with isometric growth. Absolute fecundity ranged from 1512 eggs (8.1 cm SL) to 3203 eggs (10.3 cm SL) with a mean of 2281 eggs (SD = 415.2). Fecundity–length relationship was F = 5.86 × SL2.67 (r2 = 0.702) and the fecundity–length relationship was F = 476.6 + 116.5 × L (r2 = 0.688). Mean relative fecundity was calculated as 244 eggs.cm−1 (SD = 34.1) (ranged from 179.8 to 310.9 eggs.cm−1) and 148 eggs.g−1 (SD = 14.9) (ranged from 115.1 to 171.8 eggs.g−1).
{"title":"Relationships between Body Size, Weight and Fecundity of the Endangered Fish Alburnus carinatus Battalgil, 1941 in the Manyas Lake (Turkey)","authors":"G. Saç, Ö. Gaygusuz","doi":"10.26650/ase2019600582","DOIUrl":"https://doi.org/10.26650/ase2019600582","url":null,"abstract":"Alburnus carinatus Battalgil, 1941 is an endangered fish species, which has a narrow distribution range in two shallow lake basins in northwest Anatolia. The present study aimed to describe the reproductive potential of this endemic fish with the relationships between body size, weight, and fecundity. A total of 101 female A. carinatus were captured from the Manyas Lake between January and June 2019. The standard length and body weight of these samples varied between 8.1– 15.0 cm and 9.38–65.45 g, respectively. The length-weight relationship of the female A. carinatus was calculated as W = 0.020 × SL2.959 (r2 = 0.866) with isometric growth. Absolute fecundity ranged from 1512 eggs (8.1 cm SL) to 3203 eggs (10.3 cm SL) with a mean of 2281 eggs (SD = 415.2). Fecundity–length relationship was F = 5.86 × SL2.67 (r2 = 0.702) and the fecundity–length relationship was F = 476.6 + 116.5 × L (r2 = 0.688). Mean relative fecundity was calculated as 244 eggs.cm−1 (SD = 34.1) (ranged from 179.8 to 310.9 eggs.cm−1) and 148 eggs.g−1 (SD = 14.9) (ranged from 115.1 to 171.8 eggs.g−1).","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42062966","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}
Y. Alparslan, Cansu Metin, H. H. Yapıcı, Zerrin Ekşi, Ümran Ateş, T. Baygar
The present study is aimed to detect the nutritional composition and fatty acids profile of two different Mullet species caught from the/a fish barrier in Koycegiz Lagoon (Mugla, Turkey) over a period of 12 months. A nutritional composition (protein, lipid, moisture and ash) and fatty acids profile were carried out for each commercially important mullet species; Mugil cephalus and Chelon saliens using standard measurement methods and gas chromatography (GC), respectively. The nutritional composition of the species showed differences depending on the harvesting and spawning seasons. Two mullet species had the highest fat content (P<0.05) in spawning time, while moisture content was low (P<0.05) during the same period. Predominant fatty acids for two different mullet species were myristic acid, palmitic acid and stearic acid as saturated (SFA); palmitoleic acid, oleic acid and cis-11-eicosenoic acid as monounsaturated fatty acids (MUFAs); linoleic, cis-8, 11, 14- eicosatrienoic, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) as polyunsaturated fatty acids (PUFAs). The nutritional and fatty acid composition content of species varied due to the harvesting season, reproduction period and age of the fish. The results exhibited that mullet species during the reproductive period have higher lipid content and fatty acid composition, especially in terms of EPA and DHA.
{"title":"Nutritional Composition and Fatty Acid Profile of Commercially Important Mullet Species in the Köyceğiz Lagoon","authors":"Y. Alparslan, Cansu Metin, H. H. Yapıcı, Zerrin Ekşi, Ümran Ateş, T. Baygar","doi":"10.26650/ase2019598683","DOIUrl":"https://doi.org/10.26650/ase2019598683","url":null,"abstract":"The present study is aimed to detect the nutritional composition and fatty acids profile of two different Mullet species caught from the/a fish barrier in Koycegiz Lagoon (Mugla, Turkey) over a period of 12 months. A nutritional composition (protein, lipid, moisture and ash) and fatty acids profile were carried out for each commercially important mullet species; Mugil cephalus and Chelon saliens using standard measurement methods and gas chromatography (GC), respectively. The nutritional composition of the species showed differences depending on the harvesting and spawning seasons. Two mullet species had the highest fat content (P<0.05) in spawning time, while moisture content was low (P<0.05) during the same period. Predominant fatty acids for two different mullet species were myristic acid, palmitic acid and stearic acid as saturated (SFA); palmitoleic acid, oleic acid and cis-11-eicosenoic acid as monounsaturated fatty acids (MUFAs); linoleic, cis-8, 11, 14- eicosatrienoic, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) as polyunsaturated fatty acids (PUFAs). The nutritional and fatty acid composition content of species varied due to the harvesting season, reproduction period and age of the fish. The results exhibited that mullet species during the reproductive period have higher lipid content and fatty acid composition, especially in terms of EPA and DHA.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44945414","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}
In this study, protease enzyme activity of Pelophylax ridibundus (Pallas, 1771) tadpoles was determined during the larval period starting from 25 Gosner stage (1960). When the P. ridibundus tadpoles reached the 25 Gosner stage (1960) on the 22nd day, the sampling was continued until the metamorphosis was completed by sampling at 5-day intervals. Initial average weight and length of the tadpoles were 0.076 g and 6.42 mm, respectively. The tadpoles were fed with pellet feed the size of 2 mm and 39% crude protein content twice a day in the morning and afternoon. The differences in the protease activity between the 22nd day and the 62nd day of the metamorphosis were found statistically significant (P<0.05). It has been observed that the protease enzyme reached maximum level at the 32nd day. In the next stages, protease activity showed a tendency to increase and decrease up to metamorphosis. These results can be used as the basis for the most appropriate nutritional formulation for P. ridibundus in the larval stage.
{"title":"The Characterization and Activity of Protease Enzyme on Different Days of Tadpoles [Pelophylax ridibundus (Pallas, 1771)]","authors":"H. Şereflişan, Ahmet Alkaya, Kaya Gökçek","doi":"10.26650/ase2019567360","DOIUrl":"https://doi.org/10.26650/ase2019567360","url":null,"abstract":"In this study, protease enzyme activity of Pelophylax ridibundus (Pallas, 1771) tadpoles was determined during the larval period starting from 25 Gosner stage (1960). When the P. ridibundus tadpoles reached the 25 Gosner stage (1960) on the 22nd day, the sampling was continued until the metamorphosis was completed by sampling at 5-day intervals. Initial average weight and length of the tadpoles were 0.076 g and 6.42 mm, respectively. The tadpoles were fed with pellet feed the size of 2 mm and 39% crude protein content twice a day in the morning and afternoon. The differences in the protease activity between the 22nd day and the 62nd day of the metamorphosis were found statistically significant (P<0.05). It has been observed that the protease enzyme reached maximum level at the 32nd day. In the next stages, protease activity showed a tendency to increase and decrease up to metamorphosis. These results can be used as the basis for the most appropriate nutritional formulation for P. ridibundus in the larval stage.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46991098","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}
Coastal lakes are shallow lakes that have variable characteristics through fluctuations and marine winds. In this study, benthic diatom composition in the coastal lake of Iztuzu, Dalyan of Mugla was investigated from the material collected in 2011 and 2015. Little research has been done on coastal lakes and lagoon diatom flora in Turkey; this study contributes a total of 49 taxa identified to species level and 9 of the taxa for the first time recorded for diatom flora of Turkey. The most abundant taxa were; Cocconeis placentula Ehrenberg, Diploneis bombus (Ehrenberg) Ehrenberg, Mastogloia sp. and Chamaepinnularia alexandrowiczii Witkowski, Lange-Bertalot and Metzeltin. The results reveal a habitat-specific flora for Iztuzu Lake and give an aspect of understanding the marine-brackish distribution of diatoms in coastal lakes and lagoons. The results extend the knowledge of marine and brackish diatoms in Turkey and could provide data for similar lagoon and lakes which are under protection.
沿海湖泊是浅湖，由于波动和海风而具有不同的特征。本研究利用2011年和2015年采集的资料，对穆格拉大连市伊兹图祖沿海湖泊底栖硅藻组成进行了调查。对土耳其沿海湖泊和泻湖硅藻区系的研究很少;本研究为土耳其硅藻区系提供了49个物种鉴定分类群，其中9个为首次记录的分类群。最丰富的分类群是;coconeis placentula Ehrenberg, Diploneis bombus (Ehrenberg) Ehrenberg, Mastogloia p. and Chamaepinnularia alexandrowiczii Witkowski, Lange-Bertalot and Metzeltin。研究结果揭示了伊祖祖湖的生境特异性植物区系，并为了解沿海湖泊和泻湖中硅藻的海洋半咸水分布提供了一个方面。研究结果扩展了对土耳其海洋和咸淡硅藻的认识，并可为类似的泻湖和受保护的湖泊提供数据。
{"title":"Benthic Diatom Composition of Iztuzu Coastal Lake, Dalyan (Aegean Sea, Turkey)","authors":"Aydın Kaleli","doi":"10.26650/ase2019575987","DOIUrl":"https://doi.org/10.26650/ase2019575987","url":null,"abstract":"Coastal lakes are shallow lakes that have variable characteristics through fluctuations and marine winds. In this study, benthic diatom composition in the coastal lake of Iztuzu, Dalyan of Mugla was investigated from the material collected in 2011 and 2015. Little research has been done on coastal lakes and lagoon diatom flora in Turkey; this study contributes a total of 49 taxa identified to species level and 9 of the taxa for the first time recorded for diatom flora of Turkey. The most abundant taxa were; Cocconeis placentula Ehrenberg, Diploneis bombus (Ehrenberg) Ehrenberg, Mastogloia sp. and Chamaepinnularia alexandrowiczii Witkowski, Lange-Bertalot and Metzeltin. The results reveal a habitat-specific flora for Iztuzu Lake and give an aspect of understanding the marine-brackish distribution of diatoms in coastal lakes and lagoons. The results extend the knowledge of marine and brackish diatoms in Turkey and could provide data for similar lagoon and lakes which are under protection.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69058291","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}
A. Ayaz, Uğur Altinağaç, Alkan Öztekin, Uğur Özekinci
In this study, the aim was to investigate the seasonal variations in the selectivity of striped red mullet (Mullus surmuletus L., 1758) captured by gill nets during the year in the north Aegean Sea. Fisheries’ operations were carried out between August 2008 and August 2009. Gill nets with 18, 20, and 22 mm mesh sizes were used in the trials. These nets are widely used in the region. Gill nets were deployed three hours before sunset and were removed from the sea at sunset. Similarly, the nets were set up two hours before sunrise and hauled from the sea an hour after sunrise. The SELECT method was used to determine the selectivity of gill nets. The deviances from the SELECT method revealed that lognormal models gave the best fits for all seasons. As a result of the calculations made according to the lognormal model, the modal lengths of the gill nets were calculated as the shortest in the spring season and the longest in the summer. The spread values of the selectivity curves of the experimental gill nets were determined the lowest in the winter season and the highest in the summer season. As a result of selectivity analysis, the differences between the spring and summer season modal lengths of the nets were calculated as 1.5 cm, 1.65 cm, and 1.82 cm for the nets with 18 mm, 20 mm, and 22 mm mesh sizes, respectively. The study results showed that the fishing season was important in gill nets selectivity.
{"title":"The Effect of Seasons on Gill Net Selectivity","authors":"A. Ayaz, Uğur Altinağaç, Alkan Öztekin, Uğur Özekinci","doi":"10.26650/ase2019575395","DOIUrl":"https://doi.org/10.26650/ase2019575395","url":null,"abstract":"In this study, the aim was to investigate the seasonal variations in the selectivity of striped red mullet (Mullus surmuletus L., 1758) captured by gill nets during the year in the north Aegean Sea. Fisheries’ operations were carried out between August 2008 and August 2009. Gill nets with 18, 20, and 22 mm mesh sizes were used in the trials. These nets are widely used in the region. Gill nets were deployed three hours before sunset and were removed from the sea at sunset. Similarly, the nets were set up two hours before sunrise and hauled from the sea an hour after sunrise. The SELECT method was used to determine the selectivity of gill nets. The deviances from the SELECT method revealed that lognormal models gave the best fits for all seasons. As a result of the calculations made according to the lognormal model, the modal lengths of the gill nets were calculated as the shortest in the spring season and the longest in the summer. The spread values of the selectivity curves of the experimental gill nets were determined the lowest in the winter season and the highest in the summer season. As a result of selectivity analysis, the differences between the spring and summer season modal lengths of the nets were calculated as 1.5 cm, 1.65 cm, and 1.82 cm for the nets with 18 mm, 20 mm, and 22 mm mesh sizes, respectively. The study results showed that the fishing season was important in gill nets selectivity.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43548597","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}
In this study, the abundance of rotifera fauna, in the Buyukcekmece Reservoir (Istanbul) and some physicochemical features of the reservoir, were investigated between May 2009 and February 2010. In terms of physicochemical conditions, the trophic state of the reservoir was determined as eutrophic (CTSI= 57.8). A total of 33 rotifera species were identified. Keratella cochlearis represented 40.62% of the total annual rotifera present, and was predominant. It was followed by Polyarthra vulgaris (10.14%), Synchaeta oblonga (9.06%), Brachionus urceolaris (5.58%), Pompholyx sulcata (5.21%) and Epiphanes macroura (%4.86), respectively. The contribution of the other rotifer species to the annual presence of rotifera was determined as being 24.52%. The dominance of these species was attributed to the eutrophic state of the reservoir, because K. cochlearis, P. vulgaris, B. urceolaris and P. sulcata are known as eutrophication indicator species, due to their saprobic valences. Also, the trophic state of the reservoir was found to be eutrophic according to the QB/T index (= 3). According to the present data about rotifera species, and the abundance of them, the Buyukcekmece Reservoir was specified as eutrophic. However it is necessary to follow the conditions with periodic monitoring to observe the alterations in the Buyukcekmece Reservoir, in this respect the results of the present study would constitute an important baseline for subsequent studies.
本研究于2009年5月至2010年2月对伊斯坦布尔Buyukcekmece水库轮虫的区系丰度进行了调查，并对水库的一些理化特征进行了调查。理化条件判定水库营养状态为富营养化(CTSI= 57.8)。共鉴定轮虫33种。耳蜗角虫占年轮虫总数的40.62%，以耳蜗角虫为主。其次是普通多节虫(10.14%)、长绒合藻(9.06%)、熊尾臂轮虫(5.58%)、短绒蓬虫(5.21%)和大表麻虫(4.86)。其他轮虫种类对轮虫年存栏数的贡献率为24.52%。这些物种的优势可归因于水库的富营养化状态，因为耳蜗K. cochlearis, P. vulgaris, B. urceolaris和P. sulcata由于其腐生性而被称为富营养化指示物种。根据QB/T指数(= 3)，确定水库的营养状态为富营养化。根据现有轮虫种类及丰度资料，确定水库为富营养化水库。但是，有必要根据条件进行定期监测，观察布尤切克梅塞水库的变化，在这方面，本研究的结果将构成后续研究的重要基线。
{"title":"A Preliminary Study on Using Rotifera Fauna to Determine The Trophic Level of The Büyükçekmece Reservoir (İstanbul, Turkey)","authors":"Z. Dorak","doi":"10.26650/ase2019586048","DOIUrl":"https://doi.org/10.26650/ase2019586048","url":null,"abstract":"In this study, the abundance of rotifera fauna, in the Buyukcekmece Reservoir (Istanbul) and some physicochemical features of the reservoir, were investigated between May 2009 and February 2010. In terms of physicochemical conditions, the trophic state of the reservoir was determined as eutrophic (CTSI= 57.8). A total of 33 rotifera species were identified. Keratella cochlearis represented 40.62% of the total annual rotifera present, and was predominant. It was followed by Polyarthra vulgaris (10.14%), Synchaeta oblonga (9.06%), Brachionus urceolaris (5.58%), Pompholyx sulcata (5.21%) and Epiphanes macroura (%4.86), respectively. The contribution of the other rotifer species to the annual presence of rotifera was determined as being 24.52%. The dominance of these species was attributed to the eutrophic state of the reservoir, because K. cochlearis, P. vulgaris, B. urceolaris and P. sulcata are known as eutrophication indicator species, due to their saprobic valences. Also, the trophic state of the reservoir was found to be eutrophic according to the QB/T index (= 3). According to the present data about rotifera species, and the abundance of them, the Buyukcekmece Reservoir was specified as eutrophic. However it is necessary to follow the conditions with periodic monitoring to observe the alterations in the Buyukcekmece Reservoir, in this respect the results of the present study would constitute an important baseline for subsequent studies.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41631129","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}
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