To evaluate the radiological load of the fisheries ground sediments of deep-water areas in the Antalya Bay, 226Ra, 232Th, 40K and 137Cs activity concentration levels were measured with the Gamma Spectroscopy technique using a HighResolution Germanium Detector (HPGe). Sediment samples were collected from the seabed surface of five different depth ranges (between 400 – 800 m). Detected mean radionuclide activities of 226Ra, 232Th, 40K and 137Cs were 16.53±2.41, 17.9±2.54, 371.44±18.44 and 3.91±1.27 Bq kg-1, respectively. The effect of the Chernobyl Nuclear Power Plant disaster in deep water sediments of Antalya Bay was observed. However, the detected radionuclide concentrations are at acceptable levels according to the International Atomic Energy Agency (IAEA).
{"title":"Sediment Radioactivity Levels of Deep-Water Fishery Grounds in Antalya Bay","authors":"O. Güven","doi":"10.26650/ase2020714512","DOIUrl":"https://doi.org/10.26650/ase2020714512","url":null,"abstract":"To evaluate the radiological load of the fisheries ground sediments of deep-water areas in the Antalya Bay, 226Ra, 232Th, 40K and 137Cs activity concentration levels were measured with the Gamma Spectroscopy technique using a HighResolution Germanium Detector (HPGe). Sediment samples were collected from the seabed surface of five different depth ranges (between 400 – 800 m). Detected mean radionuclide activities of 226Ra, 232Th, 40K and 137Cs were 16.53±2.41, 17.9±2.54, 371.44±18.44 and 3.91±1.27 Bq kg-1, respectively. The effect of the Chernobyl Nuclear Power Plant disaster in deep water sediments of Antalya Bay was observed. However, the detected radionuclide concentrations are at acceptable levels according to the International Atomic Energy Agency (IAEA).","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44527238","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 June 2018, a single female specimen of the Ocean sunfish, Mola mola (Linnaeus, 1758) (122 cm in total length and 80 kg in weight) was caught by a commercial trammel net at a depth of 393 m in Mersin Bay (Bozyazi coast), Turkey. This paper presents the first substantiated occurrence and hence, the confirmation of M. mola in the Northeastern Mediterranean, Turkey. Morphological and meristic measurements of the specimen were made and recorded with the catalog number MEUFC-18-11-101 in the Museum of the Systematic in, Mersin University’s Faculty of Fisheries. Morphometric and mer-istic data matched other recordings of this species from parts of the Mediterranean, and the histor-ical captured record of the species in the Mediterranean was documented.
{"title":"Confirmed Occurrence of Mola mola (Linnaeus, 1758) from Mersin Bay (Northeastern Mediterranean)","authors":"D. Ergüden, D. Ayas","doi":"10.26650/ase2020679865","DOIUrl":"https://doi.org/10.26650/ase2020679865","url":null,"abstract":"In June 2018, a single female specimen of the Ocean sunfish, Mola mola (Linnaeus, 1758) (122 cm in total length and 80 kg in weight) was caught by a commercial trammel net at a depth of 393 m in Mersin Bay (Bozyazi coast), Turkey. This paper presents the first substantiated occurrence and hence, the confirmation of M. mola in the Northeastern Mediterranean, Turkey. Morphological and meristic measurements of the specimen were made and recorded with the catalog number MEUFC-18-11-101 in the Museum of the Systematic in, Mersin University’s Faculty of Fisheries. Morphometric and mer-istic data matched other recordings of this species from parts of the Mediterranean, and the histor-ical captured record of the species in the Mediterranean was documented.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43630298","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}
Menekşe Taş Divrik, M. Laçin, K. Kalkan, Sinan Yurtoğlu
This paper aims to identify the benthic macroinvertebrate fauna and some physicochemical char-acteristics of Kanak Dam Lake located in Şarkisla, Sivas. For this, water and sediment samples were taken from 4 stations of the lake between August 2016 to July 2017 at monthly intervals, and a detailed physicochemical analysis was carried out on these samples. While the identification of benthic macroinvertebrates was made to the lowest possible taxa (species, genus or families), some physicochemical characteristics of the lake water such as temperature, pH, electrical conduc-tivity, dissolved oxygen, SO4, PO4, NO3-N, NO2-N, Mg, Ca, total hardness, salinity and Cl levels were determined using various titrimetric and spectrophotometric methods. As a result, a total of 30 taxa were identified and were classified as Oligochaeta, Chironomidae, Gastropoda and other Insecta (Ephemeroptera, Trichoptera, Hemiptera (adult), Odonata, Plecoptera and larval Coleop-tera). All the identified taxa were determined as the first records for the lake. While the tempera-ture, pH, electrical conductivity, dissolved oxygen, chloride and sulfate levels were found to have the first class quality according to Turkey’s water control regulations the NO3-N and NO2-N levels in the lake were found to have the second and third class water quality, respectively. The total hard-ness of the lake water was found to be at lighthard water quality The Shannon Weiner diversity in-dex for macrobenthic fauna of the dam lake was found to be 0.64 on average. The sampling sta-tions and months were evaluated also statistically by using the Bray-Curtis Cluster Index in terms of the distribution of the benthic macroinvertebrates and physicochemical parameters.
{"title":"Determination of Benthic Macroinvertebrate Fauna and Some Physicochemical Properties of Kanak Dam Lake (Şarkışla–Sivas)","authors":"Menekşe Taş Divrik, M. Laçin, K. Kalkan, Sinan Yurtoğlu","doi":"10.26650/ase2020699151","DOIUrl":"https://doi.org/10.26650/ase2020699151","url":null,"abstract":"This paper aims to identify the benthic macroinvertebrate fauna and some physicochemical char-acteristics of Kanak Dam Lake located in Şarkisla, Sivas. For this, water and sediment samples were taken from 4 stations of the lake between August 2016 to July 2017 at monthly intervals, and a detailed physicochemical analysis was carried out on these samples. While the identification of benthic macroinvertebrates was made to the lowest possible taxa (species, genus or families), some physicochemical characteristics of the lake water such as temperature, pH, electrical conduc-tivity, dissolved oxygen, SO4, PO4, NO3-N, NO2-N, Mg, Ca, total hardness, salinity and Cl levels were determined using various titrimetric and spectrophotometric methods. As a result, a total of 30 taxa were identified and were classified as Oligochaeta, Chironomidae, Gastropoda and other Insecta (Ephemeroptera, Trichoptera, Hemiptera (adult), Odonata, Plecoptera and larval Coleop-tera). All the identified taxa were determined as the first records for the lake. While the tempera-ture, pH, electrical conductivity, dissolved oxygen, chloride and sulfate levels were found to have the first class quality according to Turkey’s water control regulations the NO3-N and NO2-N levels in the lake were found to have the second and third class water quality, respectively. The total hard-ness of the lake water was found to be at lighthard water quality The Shannon Weiner diversity in-dex for macrobenthic fauna of the dam lake was found to be 0.64 on average. The sampling sta-tions and months were evaluated also statistically by using the Bray-Curtis Cluster Index in terms of the distribution of the benthic macroinvertebrates and physicochemical parameters.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48649168","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}
The aim of the present study was to contribute to the geographic distribution and length-weight relationship of Alburnus caeruleus Heckel, 1843 living in the Euphrates and Tigris River basins (Turkey). For this purpose, fish specimens were investigated from the collection preserved in the Istanbul University Science Faculty Hydrobiology Museum (IUSHM). The length–weight relationship was calculated using the equation: W=ɑLb. Through sample examinations, A. caeruleus was identified from one new locality (Egri Stream) in the Euphrates River basin and with this contribution, the distribution range of the fish has extended to the tributaries of the Ataturk Dam Lake in the north. The results also contributed to the literature with two new localities of A. caeruleus species in the Savur Stream and River Tigris, both in the Tigris River basin. The b values calculated for the Euphrates and Tigris populations were 3.243±0.139 (n=56) and 3.340±0.329 (n=30) respectively, which both indicated positive allometric growth. In addition, the b value was calculated for A. caeruleus from the Tigris River basin is the first finding. This study also reported a new maximum length (TL) for A. caeruleus (13.0 cm).
{"title":"New Localities and Length-Weight Relationship for Alburnus caeruleus in the Euphrates and Tigris River Basins (Turkey)","authors":"G. Saç","doi":"10.26650/ase2020690727","DOIUrl":"https://doi.org/10.26650/ase2020690727","url":null,"abstract":"The aim of the present study was to contribute to the geographic distribution and length-weight relationship of Alburnus caeruleus Heckel, 1843 living in the Euphrates and Tigris River basins (Turkey). For this purpose, fish specimens were investigated from the collection preserved in the Istanbul University Science Faculty Hydrobiology Museum (IUSHM). The length–weight relationship was calculated using the equation: W=ɑLb. Through sample examinations, A. caeruleus was identified from one new locality (Egri Stream) in the Euphrates River basin and with this contribution, the distribution range of the fish has extended to the tributaries of the Ataturk Dam Lake in the north. The results also contributed to the literature with two new localities of A. caeruleus species in the Savur Stream and River Tigris, both in the Tigris River basin. The b values calculated for the Euphrates and Tigris populations were 3.243±0.139 (n=56) and 3.340±0.329 (n=30) respectively, which both indicated positive allometric growth. In addition, the b value was calculated for A. caeruleus from the Tigris River basin is the first finding. This study also reported a new maximum length (TL) for A. caeruleus (13.0 cm).","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45213314","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, length-weight relationship of Umbrina cirrosa was determined in the Black Sea while giving a maximum length and weight record for this species. A total of 102 U. cirrosa were sampled by using trammel nets between 2018 and 2019 in the southern Black Sea. The mean length and the mean weight of the specimens were estimated as 32.4 cm ± 15.02 (4.8-94) and 613.1 g ± 962.69 (1.0-7051.1), respectively. One of the sampled species was measured as 94 cm in total length, weighed 7051.1 g, and was found to be 5 years old. These measurements prove this specimen to be the largest individual for the Turkish coasts. The length-weight relationship was described as W=0.009L3.0541 (R²=0.9962) with positive allometric growth for all individuals. This is the first study conducted for U. cirrosa in the Black Sea while the maximum size record is given for all Turkish coastal waters.
{"title":"The Length – Weight Relationship and maximum length of Umbrina cirrosa (Linnaeus, 1758)","authors":"M. Aydın, A. Sözer","doi":"10.26650/ase2020699102","DOIUrl":"https://doi.org/10.26650/ase2020699102","url":null,"abstract":"In this study, length-weight relationship of Umbrina cirrosa was determined in the Black Sea while giving a maximum length and weight record for this species. A total of 102 U. cirrosa were sampled by using trammel nets between 2018 and 2019 in the southern Black Sea. The mean length and the mean weight of the specimens were estimated as 32.4 cm ± 15.02 (4.8-94) and 613.1 g ± 962.69 (1.0-7051.1), respectively. One of the sampled species was measured as 94 cm in total length, weighed 7051.1 g, and was found to be 5 years old. These measurements prove this specimen to be the largest individual for the Turkish coasts. The length-weight relationship was described as W=0.009L3.0541 (R²=0.9962) with positive allometric growth for all individuals. This is the first study conducted for U. cirrosa in the Black Sea while the maximum size record is given for all Turkish coastal waters.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41458199","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, Atlantic bonito was prepared as a salted traditional fish product known as Lakerda using the combined techniques of dry salting and brine salting. The product was preserved in brine containing 15% salt according to the traditional method and was analysed by comparison with 6.5% salt (Group A) and 6.5% salt-5% sugar (Group B) containing brine in cold storage. According to sensory analysis findings, Group A could be safely consumed from cold storage for 7 weeks and Group B for 9 weeks. The international acceptable limit values for analysis findings were not exceeded in both groups. However, the chemical and microbiological analysis results of the samples stored in the salt-sugar containing brine were found to be statistically lower than the salt-containing brine. It is concluded that the application of salt-sugar brine with acceptable results in terms of product safety and sensory properties can be recommended in the preservation of lakerda.
{"title":"Effects of Salt/Sugar Brine Storage Solutions on Shelf Life of the Salted Atlantic Bonito","authors":"N. Erkan, İ̇dil Can Tunçelli, Ö. Özden","doi":"10.26650/ase2020734449","DOIUrl":"https://doi.org/10.26650/ase2020734449","url":null,"abstract":"In this study, Atlantic bonito was prepared as a salted traditional fish product known as Lakerda using the combined techniques of dry salting and brine salting. The product was preserved in brine containing 15% salt according to the traditional method and was analysed by comparison with 6.5% salt (Group A) and 6.5% salt-5% sugar (Group B) containing brine in cold storage. According to sensory analysis findings, Group A could be safely consumed from cold storage for 7 weeks and Group B for 9 weeks. The international acceptable limit values for analysis findings were not exceeded in both groups. However, the chemical and microbiological analysis results of the samples stored in the salt-sugar containing brine were found to be statistically lower than the salt-containing brine. It is concluded that the application of salt-sugar brine with acceptable results in terms of product safety and sensory properties can be recommended in the preservation of lakerda.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49449150","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}
Microalgae are microscopic organisms and show a geographical distribution depending on the physical, dynamic, and chemical factors of the environment. These factors are mostly important for attachment and development of microalgae. Substrate, temperature, light, agitation, and turbidity can be given as examples of physical factors, whereas salinity, pH value, and vitamins can be categorized as chemical factors. In this study, the optimization of Chlorella vulgaris production was carried out by response surface methodology (RSM) using two factors of agitation rate (100-250 rpm) and nitrogen source concentration (1-4 g/L) in the cultivation of BG11 medium. Moreover, the usage of urea instead of NaNO3 was investigated and discussed.
{"title":"Bio-designing of Culture Conditions for Chlorella vulgaris Using Response Surface Methodology","authors":"Ozlem Karaveli, I. Deniz","doi":"10.26650/ase2020729502","DOIUrl":"https://doi.org/10.26650/ase2020729502","url":null,"abstract":"Microalgae are microscopic organisms and show a geographical distribution depending on the physical, dynamic, and chemical factors of the environment. These factors are mostly important for attachment and development of microalgae. Substrate, temperature, light, agitation, and turbidity can be given as examples of physical factors, whereas salinity, pH value, and vitamins can be categorized as chemical factors. In this study, the optimization of Chlorella vulgaris production was carried out by response surface methodology (RSM) using two factors of agitation rate (100-250 rpm) and nitrogen source concentration (1-4 g/L) in the cultivation of BG11 medium. Moreover, the usage of urea instead of NaNO3 was investigated and discussed.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45136384","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}
Hydrophobic Organic Contaminants (HOC) are a group of chemicals needed to determine the health of marine ecosystems, and passive sampling devices are promising tools that offer a convenient monitoring opportunity. Traditional biomonitoring studies involved different types of marine organisms, and it appeared that simultaneous deployment of passive samplers with biomonitoring organisms provided the necessary information for the calculation of the aquatic organisms’ bioaccumulation factors (BAF). There was not any other parameter than BAF, that could be used to determine the biomagnification and fate of contaminants in the upper trophic levels, which eventually affect all marine and terrestrial ecosystem health. In the light of the essence of BAF, this study applied a modified version of BAF estimation dependent on the contaminant concentrations both in the passive and active samplers. Thus, BAF parameters could be calculated properly without any need of a contaminant concentration in the surrounding water environment. For this purpose, the HOC concentration detected from the anthropogenic settlements in the coastal regions of Turkey were collocated, evaluated, and represented for different HOC groups. It was concluded that the present method is appropriate and applicable for BAF calculations of different groups of HOCs, where there are simultaneous deployments of both active and passive samplers in the process of biomonitoring studies.
{"title":"Contribution of Passive Sampling Devices on the Determination of Hydrophobic Organic Contaminant Bioaccumulation in Marine Organisms","authors":"Sevil Deniz Yakan Dündar","doi":"10.26650/ase2020648340","DOIUrl":"https://doi.org/10.26650/ase2020648340","url":null,"abstract":"Hydrophobic Organic Contaminants (HOC) are a group of chemicals needed to determine the health of marine ecosystems, and passive sampling devices are promising tools that offer a convenient monitoring opportunity. Traditional biomonitoring studies involved different types of marine organisms, and it appeared that simultaneous deployment of passive samplers with biomonitoring organisms provided the necessary information for the calculation of the aquatic organisms’ bioaccumulation factors (BAF). There was not any other parameter than BAF, that could be used to determine the biomagnification and fate of contaminants in the upper trophic levels, which eventually affect all marine and terrestrial ecosystem health. In the light of the essence of BAF, this study applied a modified version of BAF estimation dependent on the contaminant concentrations both in the passive and active samplers. Thus, BAF parameters could be calculated properly without any need of a contaminant concentration in the surrounding water environment. For this purpose, the HOC concentration detected from the anthropogenic settlements in the coastal regions of Turkey were collocated, evaluated, and represented for different HOC groups. It was concluded that the present method is appropriate and applicable for BAF calculations of different groups of HOCs, where there are simultaneous deployments of both active and passive samplers in the process of biomonitoring studies.","PeriodicalId":52866,"journal":{"name":"Aquatic Sciences and Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46744984","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}
Cyanobacteria are known for their potential for antibacterial activity against a variety of pathogens, which are of medicinal importance in drug development. In addition, Cyanobacterial species produce various secondary metabolites that are used as dye and pigmentation and food additives. Cyanobacteria Dolichospermum affine (Lemmermann) Wacklin, L. Hoffmann & Komarek was isolated from freshwater resources and its antimicrobial effect was studied. Chloroform, methanol and water extracts of D. affine were tested to investigate their efficiency against five pathogenic bacterial strains [Pseudomonas aeruginosa (ATCC 27853), Shigella dysenteriae (ATCC 11835), Escherichia coli (ATCC 25924), Staphylococcus aureus (ATCC 29213) and Bacillus subtilis (ATCC 6633)]. The antimicrobial test was determined using the disk diffusion method. The antimicrobial activities of D. affine extracts were measured using the diameter of the inhibition zone (DIZ) of the pathogen microorganisms. The results showed that B. subtilis and E.coli were more sensitive, while S. aureus and P. aeruginosa showed more intermediate results. The highest antimicrobial activity was measured against E. coli (DIZ=13.9±0.05 mm - methanol), followed by B. subtilis (DIZ=13.6±0.05 mm - methanol). The lowest antibacterial effect of D. affine extracts were observed against P. aeruginosa (DIZ=11.7±0.02 mm - chloroform) and S. aureus (DIZ=12.2±0.03 mm - chloroform). The Gram-negative bacteria S. dysenteria exhibited no zone of inhibition. The aqueous extract showed poor activities against the tested pathogenic bacteria. Therefore, this study revealed that D. affine extracts would be a promising natural resource for new antibiotics and further research would be needed.
{"title":"Antibacterial Activity of Cyanobacteria Dolichospermum affine Isolated from Freshwater","authors":"D. Yalçın","doi":"10.26650/ase2020646338","DOIUrl":"https://doi.org/10.26650/ase2020646338","url":null,"abstract":"Cyanobacteria are known for their potential for antibacterial activity against a variety of pathogens, which are of medicinal importance in drug development. In addition, Cyanobacterial species produce various secondary metabolites that are used as dye and pigmentation and food additives. Cyanobacteria Dolichospermum affine (Lemmermann) Wacklin, L. Hoffmann & Komarek was isolated from freshwater resources and its antimicrobial effect was studied. Chloroform, methanol and water extracts of D. affine were tested to investigate their efficiency against five pathogenic bacterial strains [Pseudomonas aeruginosa (ATCC 27853), Shigella dysenteriae (ATCC 11835), Escherichia coli (ATCC 25924), Staphylococcus aureus (ATCC 29213) and Bacillus subtilis (ATCC 6633)]. The antimicrobial test was determined using the disk diffusion method. The antimicrobial activities of D. affine extracts were measured using the diameter of the inhibition zone (DIZ) of the pathogen microorganisms. The results showed that B. subtilis and E.coli were more sensitive, while S. aureus and P. aeruginosa showed more intermediate results. The highest antimicrobial activity was measured against E. coli (DIZ=13.9±0.05 mm - methanol), followed by B. subtilis (DIZ=13.6±0.05 mm - methanol). The lowest antibacterial effect of D. affine extracts were observed against P. aeruginosa (DIZ=11.7±0.02 mm - chloroform) and S. aureus (DIZ=12.2±0.03 mm - chloroform). The Gram-negative bacteria S. dysenteria exhibited no zone of inhibition. The aqueous extract showed poor activities against the tested pathogenic bacteria. Therefore, this study revealed that D. affine extracts would be a promising natural resource for new antibiotics and further research would be needed.","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":"47565945","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}
The objective of this study was to determine the regressions between otolith sizes and shape indices vs. fish length, and weight of whiting, Merlangius merlangus (Linnaeus, 1758), from the Black Sea. Samples were collected randomly from commercial bottom trawlers between November 2017 and January 2018 in the western Black Sea. No differences were found in otolith size and indices by means of otolith position while a distinct difference by sexes was detected. Strong relations with high descriptive coefficients were found between otolith sizes and weight and fish length and weight. However, the regression relationships between otolith shape indices and fish length and weight were defined as very weak. As a conclusion, it can be emphasized that the otolith sizes and weight of whiting can be used for the determination of the size and weight of the fish.
{"title":"Relationships between Fish Sizes and Otolith Sizes of Whiting (Merlangius merlangus Linnaeus, 1758) from the Western Black Sea","authors":"T. Yıldız","doi":"10.26650/ase2020665838","DOIUrl":"https://doi.org/10.26650/ase2020665838","url":null,"abstract":"The objective of this study was to determine the regressions between otolith sizes and shape indices vs. fish length, and weight of whiting, Merlangius merlangus (Linnaeus, 1758), from the Black Sea. Samples were collected randomly from commercial bottom trawlers between November 2017 and January 2018 in the western Black Sea. No differences were found in otolith size and indices by means of otolith position while a distinct difference by sexes was detected. Strong relations with high descriptive coefficients were found between otolith sizes and weight and fish length and weight. However, the regression relationships between otolith shape indices and fish length and weight were defined as very weak. As a conclusion, it can be emphasized that the otolith sizes and weight of whiting can be used for the determination of the size and weight of the fish.","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":"47014807","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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