Pub Date : 2022-03-15DOI: 10.12714/egejfas.39.1.02
C. Sağlam, O. Akyol
In this study, we determined the technical characteristics and target species of some fishing gears, used in lagoon fisheries along the Aegean Sea. The samplings were carried out in five lagoons (Enez, Homa, Karina, Akköy and Güllük) between 2014 and 2016. Technical plans of the fishing gears were drawn by MS-Visio programme with scale for gillnets, but no scales for longlines. A total of 10 type set nets of which 8 trammel nets and 2 gillnets, and 3 type longlines were determined. Target species comprise 8 families and 15 species for all fishing gear examined in the lagoon. Dicentrarchus labrax, Chelon auratus, Chelon labrosus, Chelon ramada, Chelon saliens, Mugil cephalus and Sparus aurata were commonly seen in the studied lagoons. Callinectes sapidus and Platichthys flesus were determined only in the Enez lagoon and Cyprinus carpio was determined only in the Güllük lagoon.
{"title":"Diversity of used fishing gears in the Aegean lagoons","authors":"C. Sağlam, O. Akyol","doi":"10.12714/egejfas.39.1.02","DOIUrl":"https://doi.org/10.12714/egejfas.39.1.02","url":null,"abstract":"In this study, we determined the technical characteristics and target species of some fishing gears, used in lagoon fisheries along the Aegean Sea. The samplings were carried out in five lagoons (Enez, Homa, Karina, Akköy and Güllük) between 2014 and 2016. Technical plans of the fishing gears were drawn by MS-Visio programme with scale for gillnets, but no scales for longlines. A total of 10 type set nets of which 8 trammel nets and 2 gillnets, and 3 type longlines were determined. Target species comprise 8 families and 15 species for all fishing gear examined in the lagoon. Dicentrarchus labrax, Chelon auratus, Chelon labrosus, Chelon ramada, Chelon saliens, Mugil cephalus and Sparus aurata were commonly seen in the studied lagoons. Callinectes sapidus and Platichthys flesus were determined only in the Enez lagoon and Cyprinus carpio was determined only in the Güllük lagoon.","PeriodicalId":11439,"journal":{"name":"Ege Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83569727","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}
Pub Date : 2022-03-15DOI: 10.12714/egejfas.39.1.06
P. Arslan
The overuse of pesticides has been increasing since the 20th century. Depending on this use, non-target organisms are also affected apart from target organisms. Cyfluthrin is a synthetic pyrethroid pesticide used in agriculture, domestic and veterinary medicine against insects. It may also affect non-target aquatic organisms as a result of mixing with aquatic ecosystems. This study was aimed to investigate the effect of cyfluthrin on freshwater mussels, one of the aquatic invertebrate species, with hemocyte parameters. Total hemolymph counts, hemolymph cell morphology, and differential hemocyte counts were performed from hemolymph taken from mussels exposed to different cyfluthrin doses exposures for 24 and 48 hours. Compared to the control group, the total hemocyte counts of the experimental groups were found to increase in 24h and decrease in 48h significantly (p<0.05). In the examination of hemocyte morphologies, granular, semi granular, and hyalinocyte cells were observed. Similar values of differential hemocyte counts were found both 24 and 48h exposure times. As a result, in aquatic toxicology studies, besides total hemocyte count, analysis of hemocyte morphologies and differential hemocyte counts are found to be good biomarkers.
{"title":"Determinations of the effects of cyfluthrin on the hemocytes parameters of freshwater mussel (Unio delicatus)","authors":"P. Arslan","doi":"10.12714/egejfas.39.1.06","DOIUrl":"https://doi.org/10.12714/egejfas.39.1.06","url":null,"abstract":"The overuse of pesticides has been increasing since the 20th century. Depending on this use, non-target organisms are also affected apart from target organisms. Cyfluthrin is a synthetic pyrethroid pesticide used in agriculture, domestic and veterinary medicine against insects. It may also affect non-target aquatic organisms as a result of mixing with aquatic ecosystems. This study was aimed to investigate the effect of cyfluthrin on freshwater mussels, one of the aquatic invertebrate species, with hemocyte parameters. Total hemolymph counts, hemolymph cell morphology, and differential hemocyte counts were performed from hemolymph taken from mussels exposed to different cyfluthrin doses exposures for 24 and 48 hours. Compared to the control group, the total hemocyte counts of the experimental groups were found to increase in 24h and decrease in 48h significantly (p<0.05). In the examination of hemocyte morphologies, granular, semi granular, and hyalinocyte cells were observed. Similar values of differential hemocyte counts were found both 24 and 48h exposure times. As a result, in aquatic toxicology studies, besides total hemocyte count, analysis of hemocyte morphologies and differential hemocyte counts are found to be good biomarkers.","PeriodicalId":11439,"journal":{"name":"Ege Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90872835","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}
Pub Date : 2022-03-15DOI: 10.12714/egejfas.39.1.09
Levent Yurga
Marine pollution, which has been seen for the recent years in cities with a coast that industrializes day by day, was also seen in İzmir, the third most populous city of Turkey. After the destruction of Ragıp Paşa jetty and especially the completion of the Grand Canal Project, the improvement in the gulf is increasing day by day. In İzmir Bay, which is one of the most fertile areas of the Aegean Sea, excessive algae growth is occasionally observed. In this study, 360 quantitative and 1080 qualitative samples were obtained during the monitoring projects carried out jointly by İzmir Metropolitan Municipality, Dokuz Eylül University Marine Sciences and Technology Institute and Ege University Faculty of Fisheries between 1990-2016 were examined. The distribution of the 2 dominant major classes Dinophyceae and Bacillariophyceae were investigated. In addition to the species that produce toxins such as DSP, ASP and PSP into the marine environment, species that do not contain any toxins but cause adverse conditions in the environment by mass-formation were investigated.
{"title":"Investigation of harmful algae in İzmir Bay for the 30 years","authors":"Levent Yurga","doi":"10.12714/egejfas.39.1.09","DOIUrl":"https://doi.org/10.12714/egejfas.39.1.09","url":null,"abstract":"Marine pollution, which has been seen for the recent years in cities with a coast that industrializes day by day, was also seen in İzmir, the third most populous city of Turkey. After the destruction of Ragıp Paşa jetty and especially the completion of the Grand Canal Project, the improvement in the gulf is increasing day by day. In İzmir Bay, which is one of the most fertile areas of the Aegean Sea, excessive algae growth is occasionally observed. In this study, 360 quantitative and 1080 qualitative samples were obtained during the monitoring projects carried out jointly by İzmir Metropolitan Municipality, Dokuz Eylül University Marine Sciences and Technology Institute and Ege University Faculty of Fisheries between 1990-2016 were examined. The distribution of the 2 dominant major classes Dinophyceae and Bacillariophyceae were investigated. In addition to the species that produce toxins such as DSP, ASP and PSP into the marine environment, species that do not contain any toxins but cause adverse conditions in the environment by mass-formation were investigated.","PeriodicalId":11439,"journal":{"name":"Ege Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89979244","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}
Pub Date : 2022-03-15DOI: 10.12714/egejfas.39.1.04
T. Sivaruban, S. Barathy, Krishnaswamy Venkataraman, M. Arunachalam, Pandiarajan Srinivasan
The present study was carried out in 27 streams of the southern part of the Western Ghats and the Eastern Ghats from January to December 2018. The outcomes show that there is an increase in the percentage of Ephemeroptera (71%) in the first order and there was a negligible fall in the abundance of the fourth-ordered stream. LSE results show a gradual increase of Plecoptera and a gradual decrease of Trichoptera and no such variations in Ephemeroptera. Variations in mesohabitat richness were highest in the run (38.38%) and it was lowest in silt (0.5%). To compare the taxa composition in Western and Eastern Ghats taxa, five different types of river basins were classified. The species richness and abundance were higher in Tampiraparani East flowing and Vamanapuram River basin communities (Western Ghats) than in the Eastern Ghats and this shows mega diversity of Western Ghats compared to the Eastern Ghats. The results of both cluster and ordination analysis also strongly support the discrimination between Western and Eastern Ghats diversity and distribution of EPT taxa.
{"title":"Diversity of the EPT complex (Ephemeroptera, Plecoptera and Trichoptera) in the Western and Eastern Ghats (South India) caused by the variations of landscape elements and mesohabitats","authors":"T. Sivaruban, S. Barathy, Krishnaswamy Venkataraman, M. Arunachalam, Pandiarajan Srinivasan","doi":"10.12714/egejfas.39.1.04","DOIUrl":"https://doi.org/10.12714/egejfas.39.1.04","url":null,"abstract":"The present study was carried out in 27 streams of the southern part of the Western Ghats and the Eastern Ghats from January to December 2018. The outcomes show that there is an increase in the percentage of Ephemeroptera (71%) in the first order and there was a negligible fall in the abundance of the fourth-ordered stream. LSE results show a gradual increase of Plecoptera and a gradual decrease of Trichoptera and no such variations in Ephemeroptera. Variations in mesohabitat richness were highest in the run (38.38%) and it was lowest in silt (0.5%). To compare the taxa composition in Western and Eastern Ghats taxa, five different types of river basins were classified. The species richness and abundance were higher in Tampiraparani East flowing and Vamanapuram River basin communities (Western Ghats) than in the Eastern Ghats and this shows mega diversity of Western Ghats compared to the Eastern Ghats. The results of both cluster and ordination analysis also strongly support the discrimination between Western and Eastern Ghats diversity and distribution of EPT taxa.","PeriodicalId":11439,"journal":{"name":"Ege Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73376190","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}
Pub Date : 2022-03-15DOI: 10.12714/egejfas.39.1.07
B. Kafa, B. Kılınç
In this study, the total of 180 fried and 180 stuffed mussel samples from the different districts of Bornova in different seasons were sold and examined. While none of the specimens of Vibrio vulnificus and Vibrio cholerae were found, Vibrio parahaemolyticus was detected in 11 (24.4%) of 45 mussel stuffed samples examined in summer and 3 (6.7%) of 45 samples examined in autumn. In the stuffed mussel samples, V. parahaemolyticus was not found in winter and spring, while it was found in summer and autumn. Salmonella spp. was found in 14 (3.8%) of the 360 processed mussel samples and Listeria monocytogenes in 11 (3.1%). No pathogenic bacteria were detected in any of the fried mussel samples examined. As a result, it is always necessary to keep in mind that stuffed mussel can be risk for human health since it was found that it contained pathogenic bacteria, especially in the summer and in the autumn months. For this reason, it has become necessary to tighten the inspections especially in the summer and autumn months, where mussels are processed and sold.
{"title":"The microbial qualities of ready-to-eat sold processed mussel products","authors":"B. Kafa, B. Kılınç","doi":"10.12714/egejfas.39.1.07","DOIUrl":"https://doi.org/10.12714/egejfas.39.1.07","url":null,"abstract":"In this study, the total of 180 fried and 180 stuffed mussel samples from the different districts of Bornova in different seasons were sold and examined. While none of the specimens of Vibrio vulnificus and Vibrio cholerae were found, Vibrio parahaemolyticus was detected in 11 (24.4%) of 45 mussel stuffed samples examined in summer and 3 (6.7%) of 45 samples examined in autumn. In the stuffed mussel samples, V. parahaemolyticus was not found in winter and spring, while it was found in summer and autumn. Salmonella spp. was found in 14 (3.8%) of the 360 processed mussel samples and Listeria monocytogenes in 11 (3.1%). No pathogenic bacteria were detected in any of the fried mussel samples examined. As a result, it is always necessary to keep in mind that stuffed mussel can be risk for human health since it was found that it contained pathogenic bacteria, especially in the summer and in the autumn months. For this reason, it has become necessary to tighten the inspections especially in the summer and autumn months, where mussels are processed and sold.","PeriodicalId":11439,"journal":{"name":"Ege Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79261014","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}
Pub Date : 2022-03-15DOI: 10.12714/egejfas.39.1.08
Gülperi Akdemir, A. Er, Z. Ipek, M. Minaz, Ş. Kayış
The effects of ceramic balls on live transfer conditions of rainbow trout (Oncorhynchus mykiss, (Walbaum,1792)) were determined by examining ammonia, pH, dissolved oxygen, and temperature of water and gill histology of fish. Salt addition and various pH levels of water were also studied for comparison. The study was designed two different pH levels (high 7.98±0.2 and low 6.01±0.1), salt (6g/L), and ceramic ball (10g/l) addition and fish stock density to be 62.3 kg/m3. The trial tanks were mounted on a vehicle to represent actual transport conditions. Fish were sampled every hour for gill histology. As a results, the lowest ammonia value was determined as 1.98 mg/L in the ceramic ball. The highest ammonia value in the high pH group was 2.83 mg/l. When the gill tissues of the fish were examined, the significant differences observed were oedema and epithelial lifting in the control and high pH groups. Hyperplasia, epithelial lifting, and multiple deformations were observed in all the experimental groups except the ceramic ball group. This study showed that based on the histological results of the gills and the stability of the pH levels of the water and the effect on the reduction of the ammonia value of the water, that the ceramic balls are particularly useful for the transport of live fish.
{"title":"Effects of ceramic balls on trout welfare during their live transfer conditions","authors":"Gülperi Akdemir, A. Er, Z. Ipek, M. Minaz, Ş. Kayış","doi":"10.12714/egejfas.39.1.08","DOIUrl":"https://doi.org/10.12714/egejfas.39.1.08","url":null,"abstract":"The effects of ceramic balls on live transfer conditions of rainbow trout (Oncorhynchus mykiss, (Walbaum,1792)) were determined by examining ammonia, pH, dissolved oxygen, and temperature of water and gill histology of fish. Salt addition and various pH levels of water were also studied for comparison. The study was designed two different pH levels (high 7.98±0.2 and low 6.01±0.1), salt (6g/L), and ceramic ball (10g/l) addition and fish stock density to be 62.3 kg/m3. The trial tanks were mounted on a vehicle to represent actual transport conditions. Fish were sampled every hour for gill histology. As a results, the lowest ammonia value was determined as 1.98 mg/L in the ceramic ball. The highest ammonia value in the high pH group was 2.83 mg/l. When the gill tissues of the fish were examined, the significant differences observed were oedema and epithelial lifting in the control and high pH groups. Hyperplasia, epithelial lifting, and multiple deformations were observed in all the experimental groups except the ceramic ball group. This study showed that based on the histological results of the gills and the stability of the pH levels of the water and the effect on the reduction of the ammonia value of the water, that the ceramic balls are particularly useful for the transport of live fish.","PeriodicalId":11439,"journal":{"name":"Ege Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77401225","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}
Pub Date : 2022-03-15DOI: 10.12714/egejfas.39.1.12
A. Ç. Oruç, Tuğçe Şensurat-Genç, Aytaç Özgül, Altan Lök
Pterois miles (Bennett, 1828) is an aquatic invader and disruptive predator for marine ecosystems. A single lionfish was photographed and sampled in March 2021 during a scientific survey at 36 m depth in Karaburun/İzmir Bay. In this study presents an update on the lionfish's northward progression in the Aegean Sea.
Pterois miles (Bennett, 1828)是一种水生入侵者和海洋生态系统的破坏性捕食者。2021年3月，在卡拉布伦/İzmir湾36米深的科学调查中，对一条狮子鱼进行了拍摄和采样。在这项研究中，提出了狮子鱼在爱琴海向北发展的最新情况。
{"title":"The northernmost dispersal record of the lionfish, Pterois miles (Bennett, 1828) for the Aegean Sea","authors":"A. Ç. Oruç, Tuğçe Şensurat-Genç, Aytaç Özgül, Altan Lök","doi":"10.12714/egejfas.39.1.12","DOIUrl":"https://doi.org/10.12714/egejfas.39.1.12","url":null,"abstract":"Pterois miles (Bennett, 1828) is an aquatic invader and disruptive predator for marine ecosystems. A single lionfish was photographed and sampled in March 2021 during a scientific survey at 36 m depth in Karaburun/İzmir Bay. In this study presents an update on the lionfish's northward progression in the Aegean Sea.","PeriodicalId":11439,"journal":{"name":"Ege Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78685623","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}
Pub Date : 2022-03-15DOI: 10.12714/egejfas.39.1.10
A. Polat, Bahar Tokur, Hakan Buga
In the current investigation, fresh trout viscera and smoked trout trimmings were enzymatically extracted using papain, alcalase, protamex, and flavourzyme. Protein extraction was performed at different concentrations (0.5%, 1%, 1.5% and 2%) and times (30 minute, 1 hour and 4 hours). The moisture, crude protein, lipid and crude ash contents of trout viscera used as raw materials, in the study, were respectively found as 60.26±0.78%, 12.18±0.21%, 31.18±0.36% and 1.33±0.07%, while these values in smoked trout trimmings were determined as 54.53±0.93%, 18.39±0.13%, 17.71 ± 1.06% and 8.50±0.13%, respectively. Following the conclusion of the study, protein content (g protein/100 g waste) and Protein Recovery Rate (PRR, %) in liquid protein hydrolysate extracted from trout viscera and smoked trout trimmings were found to be significantly affected by enzyme type, enzyme concentration, and extraction time. The results showed that the flavourzyme, followed by the protamex, produced the highest protein content (g protein/100 g waste) and PRR (%) in the liquid protein hydrolysate extracted from trout viscera. Furthermore, the protamex, followed by the flavourzyme, was shown to have the highest protein content (g protein /100 g waste) and PRR (%) in the liquid protein hydrolysate extracted from smoked trout trimmings.
{"title":"Extraction of protein from fresh rainbow trout (Onchorhynchus mykiss) viscera and smoked trout trimmings using commercial enzymes","authors":"A. Polat, Bahar Tokur, Hakan Buga","doi":"10.12714/egejfas.39.1.10","DOIUrl":"https://doi.org/10.12714/egejfas.39.1.10","url":null,"abstract":"In the current investigation, fresh trout viscera and smoked trout trimmings were enzymatically extracted using papain, alcalase, protamex, and flavourzyme. Protein extraction was performed at different concentrations (0.5%, 1%, 1.5% and 2%) and times (30 minute, 1 hour and 4 hours). The moisture, crude protein, lipid and crude ash contents of trout viscera used as raw materials, in the study, were respectively found as 60.26±0.78%, 12.18±0.21%, 31.18±0.36% and 1.33±0.07%, while these values in smoked trout trimmings were determined as 54.53±0.93%, 18.39±0.13%, 17.71 ± 1.06% and 8.50±0.13%, respectively. Following the conclusion of the study, protein content (g protein/100 g waste) and Protein Recovery Rate (PRR, %) in liquid protein hydrolysate extracted from trout viscera and smoked trout trimmings were found to be significantly affected by enzyme type, enzyme concentration, and extraction time. The results showed that the flavourzyme, followed by the protamex, produced the highest protein content (g protein/100 g waste) and PRR (%) in the liquid protein hydrolysate extracted from trout viscera. Furthermore, the protamex, followed by the flavourzyme, was shown to have the highest protein content (g protein /100 g waste) and PRR (%) in the liquid protein hydrolysate extracted from smoked trout trimmings.","PeriodicalId":11439,"journal":{"name":"Ege Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80340624","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}
Pub Date : 2022-03-15DOI: 10.12714/egejfas.39.1.01
M. Dağtekin, Serhan Candemir, G. Erik, Gülsüm Balçık Mısır
The inevitable increase in the numerical and technological capacity of fishing fleets in developed and developing countries has major implications for the management and distribution of limited natural resource capacity, as well as the ecological and socio-economic sustainability of fisheries. It is important to determine these effects to make the right decisions in fisheries management. This study aims to assess the fishing capacity, technical efficiency, scale efficiency, and capacity use in a specific subset of Rapa whelk fishers, those in Turkey's Black Sea. Economically efficient and inefficient boats were also compared in the study. The data obtained through face-to-face interviews with 452 boat owners constitute the main data of the study. Data were collected about the economic efficiency of the boats for one year. While economic efficiency ranged between 0.27 and 1, the average value was found to be 0.60. It was concluded that the age of the owner, the education period, and the length of the fishing boat positively affected economic efficiency (p<0.05). In the boats studied, technical efficiency scores were greater than economic efficiency scores. This suggests that rather than technical information, fishers require information on selecting the optimum input combination at the data cost level.
{"title":"Determinants of economic efficiency: A case study of Rapa whelk (Rapana venosa) fisheries in the South Black Sea","authors":"M. Dağtekin, Serhan Candemir, G. Erik, Gülsüm Balçık Mısır","doi":"10.12714/egejfas.39.1.01","DOIUrl":"https://doi.org/10.12714/egejfas.39.1.01","url":null,"abstract":"The inevitable increase in the numerical and technological capacity of fishing fleets in developed and developing countries has major implications for the management and distribution of limited natural resource capacity, as well as the ecological and socio-economic sustainability of fisheries. It is important to determine these effects to make the right decisions in fisheries management. This study aims to assess the fishing capacity, technical efficiency, scale efficiency, and capacity use in a specific subset of Rapa whelk fishers, those in Turkey's Black Sea. Economically efficient and inefficient boats were also compared in the study. The data obtained through face-to-face interviews with 452 boat owners constitute the main data of the study. Data were collected about the economic efficiency of the boats for one year. While economic efficiency ranged between 0.27 and 1, the average value was found to be 0.60. It was concluded that the age of the owner, the education period, and the length of the fishing boat positively affected economic efficiency (p<0.05). In the boats studied, technical efficiency scores were greater than economic efficiency scores. This suggests that rather than technical information, fishers require information on selecting the optimum input combination at the data cost level.","PeriodicalId":11439,"journal":{"name":"Ege Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83465878","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}
Pub Date : 2022-03-15DOI: 10.12714/egejfas.39.1.05
S. Yedier, S. Kontaş, D. Bostancı
Fluctuating asymmetry can cause developmental disorders in fish, and particularly high levels of asymmetry adversely affect fish life. In this study, the fluctuating asymmetry levels of the otoliths of four Alburnus species (A. chalcoides (Güldenstädt, 1772), A. tarichi (Güldenstädt, 1814), A. escherichii Steindachner, 1897, and A. mossulensis Heckel, 1843) found in Turkish inland waters were investigated. A total of 160 fish were collected in the Turkish inland waters. The fluctuating asymmetry level was calculated for the width and length characters of the asteriscus. Alburnus species, which were examined in the present study, were divided into four total length classes and fluctuating asymmetry of otolith was evaluated according to both the total length classes and species. There was significant difference between the right and left asteriscus otolith measurements for A. escherichii (P<0.05). Besides, there were no significant differences between females and males’ otoliths measurements of the species (P>0.05). The highest and lowest asymmetry levels in the otolith length and otolith width were calculated in the A. escherichii among the Alburnus species. However, the highest and lowest asymmetry levels in otolith length and otolith width were calculated in the A. mossulensis among the total length groups of the Alburnus species. In this study, it was determined that the fluctuating asymmetry level varies according to different fish species and habitats.
波动的不对称会导致鱼类发育障碍，特别是高度的不对称会对鱼类的生活产生不利影响。本研究调查了在土耳其内陆水域发现的四种Alburnus (A. chalcoides (Güldenstädt, 1772)， A. tarichi (Güldenstädt, 1814)， A. escherichii Steindachner(1897)和A. mossulensis Heckel(1843))耳石的波动不对称水平。在土耳其内陆水域共捕获了160条鱼。计算了星形体宽度和长度特征的波动不对称水平。将本研究选取的耳石种分为4个总长度类，并根据总长度类和种对耳石的波动不对称性进行了评价。埃氏拟蚊左右星形耳石测量值差异有统计学意义(P0.05)。计算了耳石长度和宽度的最高和最低不对称水平。然而，在Alburnus种的总长度类群中，计算了摩苏尔沙蚊耳石长度和耳石宽度的最高和最低不对称水平。在本研究中，我们确定了波动不对称水平随鱼类种类和生境的不同而不同。
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