Jihade Alahyene, Brahim Chiahou, Hammou El Habouz, Abdelbasset Ben-Bani
Abstract The study on the reproductive biology of shortfin mako shark is carried out through the commercial catches from artisanal boats active on the Moroccan Central Atlantic coast and landed in Sidi Ifni Port, for the period between October 2017 and August 2019. A total of 1690 individuals were examined, including 846 females and 844 males. As a result, the overall sex ratio of shortfin mako sharks tends towards equilibrium. The monthly sex ratio in shortfin mako sharks shows that males are more abundant compared to females in winter. In autumn and spring, we encounter more females. For the remainder of the year, the sex ratio tends to be balanced, with a slight predominance of males. Three stages of the maturity scale were found. Juvenile males with a rate of 50% were most frequently encountered during the study, followed by subadults with a rate of 32% and adults with a rate of 18%. The size at first sexual maturity of the male shortfin mako shark was estimated to be between 180 cm and 200 cm in total length, corresponding to an estimated age of 6 years.
{"title":"Sex Ratio and Male Maturity for Shortfin Mako Shark in the Moroccan Central Atlantic Coast","authors":"Jihade Alahyene, Brahim Chiahou, Hammou El Habouz, Abdelbasset Ben-Bani","doi":"10.2478/cjf-2022-0007","DOIUrl":"https://doi.org/10.2478/cjf-2022-0007","url":null,"abstract":"Abstract The study on the reproductive biology of shortfin mako shark is carried out through the commercial catches from artisanal boats active on the Moroccan Central Atlantic coast and landed in Sidi Ifni Port, for the period between October 2017 and August 2019. A total of 1690 individuals were examined, including 846 females and 844 males. As a result, the overall sex ratio of shortfin mako sharks tends towards equilibrium. The monthly sex ratio in shortfin mako sharks shows that males are more abundant compared to females in winter. In autumn and spring, we encounter more females. For the remainder of the year, the sex ratio tends to be balanced, with a slight predominance of males. Three stages of the maturity scale were found. Juvenile males with a rate of 50% were most frequently encountered during the study, followed by subadults with a rate of 32% and adults with a rate of 18%. The size at first sexual maturity of the male shortfin mako shark was estimated to be between 180 cm and 200 cm in total length, corresponding to an estimated age of 6 years.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"80 1","pages":"67 - 75"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44146725","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}
Abstract The aim of this research is to analyse trends of anglers’ total catches of the most important fish species caught by angling in different parts of the Sava River Basin in Croatia (Cyprinus carpio, Silurus glanis, Esox lucius and Sander lucioperca). In all investigated counties, with the exception of Vukovar-Sirmium, common carp is the dominant fish species, usually present in significantly higher quantities compared to the other three species. Only in Vukovar-Sirmium county, northern pike is the dominant species caught. In most counties there are no dramatic changes in the catches of these four fish species, apart from the usual oscillations. Due to high fishing pressure and possibly inflow of polluted water from the Bosna River, Vukovar-Sirmium county is also particularly characterised by the trend of declining catches of all four species. The significant negative correlation between the average catch and the respective value of the coefficient of variation (CV) was also found for all data.
{"title":"Trends in Total Anglers’ Catches At the Croatian Section of the Sava River Basin","authors":"T. Treer","doi":"10.2478/cjf-2022-0010","DOIUrl":"https://doi.org/10.2478/cjf-2022-0010","url":null,"abstract":"Abstract The aim of this research is to analyse trends of anglers’ total catches of the most important fish species caught by angling in different parts of the Sava River Basin in Croatia (Cyprinus carpio, Silurus glanis, Esox lucius and Sander lucioperca). In all investigated counties, with the exception of Vukovar-Sirmium, common carp is the dominant fish species, usually present in significantly higher quantities compared to the other three species. Only in Vukovar-Sirmium county, northern pike is the dominant species caught. In most counties there are no dramatic changes in the catches of these four fish species, apart from the usual oscillations. Due to high fishing pressure and possibly inflow of polluted water from the Bosna River, Vukovar-Sirmium county is also particularly characterised by the trend of declining catches of all four species. The significant negative correlation between the average catch and the respective value of the coefficient of variation (CV) was also found for all data.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"80 1","pages":"97 - 101"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46076019","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}
Abstract A study of the interannual variability of the size-age composition of M. barbatus ponticus, inhabiting the south-western shelf of the Crimea, was carried out over a five-year period (between 2016 and 2020). The influence of habitat temperature on growth rate is considered. Equations obtained characterize the size-weight growth of M. barbatus ponticus. The influence of the sea temperature on the development of individuals is considered. It is shown that with an increase in the average annual water temperature, the average annual length (correlation coefficient r = 0.97), weight (r = 0.96) and condition factor (r = 0.93) of individuals increase. It was found that red mullet has a positive allometric growth in the study area. The analysis showed that there was a close correlation between changes in the average annual temperature and the allometric growth rate b (r = 0.97). The equations of length growth of M. barbatus ponticus showed retarded linear growth of the fish living on the south-western shelf of the Crimea in comparison with other areas, Sinop region (Black Sea) and the Aegean Sea. The comparison of the effect of temperature on the size and weight parameters of M. barbatus ponticus living in the south-eastern part of the Black Sea (Sinop region) and the Aegean Sea is carried out; general patterns and differences are noted.
{"title":"Influence of Abiotic Environmental Factors on the Growth Rate of Red Mullet","authors":"E. Melnikova, N. Kuzminova","doi":"10.2478/cjf-2022-0009","DOIUrl":"https://doi.org/10.2478/cjf-2022-0009","url":null,"abstract":"Abstract A study of the interannual variability of the size-age composition of M. barbatus ponticus, inhabiting the south-western shelf of the Crimea, was carried out over a five-year period (between 2016 and 2020). The influence of habitat temperature on growth rate is considered. Equations obtained characterize the size-weight growth of M. barbatus ponticus. The influence of the sea temperature on the development of individuals is considered. It is shown that with an increase in the average annual water temperature, the average annual length (correlation coefficient r = 0.97), weight (r = 0.96) and condition factor (r = 0.93) of individuals increase. It was found that red mullet has a positive allometric growth in the study area. The analysis showed that there was a close correlation between changes in the average annual temperature and the allometric growth rate b (r = 0.97). The equations of length growth of M. barbatus ponticus showed retarded linear growth of the fish living on the south-western shelf of the Crimea in comparison with other areas, Sinop region (Black Sea) and the Aegean Sea. The comparison of the effect of temperature on the size and weight parameters of M. barbatus ponticus living in the south-eastern part of the Black Sea (Sinop region) and the Aegean Sea is carried out; general patterns and differences are noted.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"80 1","pages":"87 - 95"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49311633","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}
Abstract The endocrine-disrupting effects of triclosan, an antimicrobial agent, and its involvement in reproductive responses mediated through different modes of activity in various fish species have been documented. The present study aims to explore whether triclosan at environmentally relevant and sublethal concentrations could influence the reproductive physiology of the fish Anabas testudineus in the spawning phase. Fish were exposed to triclosan at environmentally relevant (0.009 and 9 µg L−1) and sublethal (176.7 µg L−1) concentrations for 4, 7, 30 and 60 d during the spawning phase for evaluating the reproductive potential of the fish. Triclosan exposure caused a significant (P<0.05) reduction in the level of total protein in gonads and liver tissues while increasing blood plasma to meet the energy demand and overcome metabolic stress. Impairment in gonadal steroidogenesis was evidenced by the reduction in the activities of 3β- and 17β-hydroxysteroid dehydrogenases associated with alteration in the levels of serum gonadotropins, sex steroid hormones and vitellogenin. Triclosan exposure caused a reduction in the rate of fecundity in females and declined sperm counts, motility and viability in males. Histological lesions in gonadal tissues further confirmed the reproductive toxicity of triclosan, which in turn could contribute to the reproductive failure of the fish.
摘要研究了抗菌药物三氯生的内分泌干扰作用及其通过不同的活动模式介导的多种鱼类的生殖反应。本研究旨在探讨环境相关浓度和亚致死浓度的三氯生是否会影响龙鱼产卵期的生殖生理。在产卵期，将鱼暴露在环境相关浓度(0.009和9µg L - 1)和亚致死浓度(176.7µg L - 1)的三氯生环境中4、7、30和60天，以评估鱼的生殖潜力。三氯生暴露导致性腺和肝脏组织总蛋白水平显著(P<0.05)降低，血浆水平升高以满足能量需求和克服代谢应激。性腺甾体生成障碍的证据是，与血清促性腺激素、性类固醇激素和卵黄原蛋白水平改变相关的3β-和17β-羟基类固醇脱氢酶活性降低。暴露在三氯生环境中会导致女性的繁殖率下降，男性的精子数量、活力和生存能力下降。性腺组织的组织学病变进一步证实了三氯生的生殖毒性，这反过来又可能导致鱼的生殖失败。
{"title":"Triclosan Influences on Reproductive Physiology of Climbing Perch in the Spawning Phase","authors":"C. V. Priyatha, K. Chitra","doi":"10.2478/cjf-2022-0006","DOIUrl":"https://doi.org/10.2478/cjf-2022-0006","url":null,"abstract":"Abstract The endocrine-disrupting effects of triclosan, an antimicrobial agent, and its involvement in reproductive responses mediated through different modes of activity in various fish species have been documented. The present study aims to explore whether triclosan at environmentally relevant and sublethal concentrations could influence the reproductive physiology of the fish Anabas testudineus in the spawning phase. Fish were exposed to triclosan at environmentally relevant (0.009 and 9 µg L−1) and sublethal (176.7 µg L−1) concentrations for 4, 7, 30 and 60 d during the spawning phase for evaluating the reproductive potential of the fish. Triclosan exposure caused a significant (P<0.05) reduction in the level of total protein in gonads and liver tissues while increasing blood plasma to meet the energy demand and overcome metabolic stress. Impairment in gonadal steroidogenesis was evidenced by the reduction in the activities of 3β- and 17β-hydroxysteroid dehydrogenases associated with alteration in the levels of serum gonadotropins, sex steroid hormones and vitellogenin. Triclosan exposure caused a reduction in the rate of fecundity in females and declined sperm counts, motility and viability in males. Histological lesions in gonadal tissues further confirmed the reproductive toxicity of triclosan, which in turn could contribute to the reproductive failure of the fish.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"80 1","pages":"47 - 66"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45775724","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}
P. W. Purnomo, F. Purwanti, Dhanar Syahrizal Akhmad
Abstract Karimunjawa as a marine national park has attracted tourists to come and explore coral reefs. The reefs are under increasing pressure from the development of underwater tourist activities so it is necessary to pay attention to the reef condition to maintain its sustainability. This study was conducted in September 2019 by examining the condition of coral reefs in the most visited snorkeling spots based on information from tour operators, i.e. the Ujung Bintang, Maer and Karang Sendok spots. Data was collected using a 20 m line belt transect to count coral cover and was analyzed using coral morphology triangles to assess the Coral Condition Index (CCI) and Impact Severity Index (ISI). The condition of coral reef cover at the Ujung Bintang and Maer spots were in the “good” category based on the CCI, while at the Karang Sendok spot the corals were in the “bad” category based on the ISI. The three snorkeling spots have competition-adapted (K) morphology, which means that the coral reefs are dominated by non-Acropora corals associated with coral reefs with high waves. The dominant life form at the Ujung Bintang spot was foliose corals, at the Maer spot, it was foliose coral and non-Acropora branching corals, while at the Karang Sendok it was Acropora, which is more vulnerable than foliose and massive corals. The CCI at the three spots was in the “good” category as there are healthy coral colonies, whereas the ISI was in the “poor” category since partially and recently dead coral colonies were found there. The coral colony damage in the spots was dominated by bleached coral colonies and partially dead coral colonies.
{"title":"Coral Reef Conditions At the Snorkeling Spots of the Karimunjawa National Park, Indonesia","authors":"P. W. Purnomo, F. Purwanti, Dhanar Syahrizal Akhmad","doi":"10.2478/cjf-2022-0008","DOIUrl":"https://doi.org/10.2478/cjf-2022-0008","url":null,"abstract":"Abstract Karimunjawa as a marine national park has attracted tourists to come and explore coral reefs. The reefs are under increasing pressure from the development of underwater tourist activities so it is necessary to pay attention to the reef condition to maintain its sustainability. This study was conducted in September 2019 by examining the condition of coral reefs in the most visited snorkeling spots based on information from tour operators, i.e. the Ujung Bintang, Maer and Karang Sendok spots. Data was collected using a 20 m line belt transect to count coral cover and was analyzed using coral morphology triangles to assess the Coral Condition Index (CCI) and Impact Severity Index (ISI). The condition of coral reef cover at the Ujung Bintang and Maer spots were in the “good” category based on the CCI, while at the Karang Sendok spot the corals were in the “bad” category based on the ISI. The three snorkeling spots have competition-adapted (K) morphology, which means that the coral reefs are dominated by non-Acropora corals associated with coral reefs with high waves. The dominant life form at the Ujung Bintang spot was foliose corals, at the Maer spot, it was foliose coral and non-Acropora branching corals, while at the Karang Sendok it was Acropora, which is more vulnerable than foliose and massive corals. The CCI at the three spots was in the “good” category as there are healthy coral colonies, whereas the ISI was in the “poor” category since partially and recently dead coral colonies were found there. The coral colony damage in the spots was dominated by bleached coral colonies and partially dead coral colonies.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"80 1","pages":"77 - 86"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44240682","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}
Abstract Historically, two angel shark species, common angel shark Squatina squatina and smoothback angel shark Squatina oculata, were common in the upper continental shelf of the eastern Adriatic Sea. Although both species are considered critically endangered in the Adriatic and the rest of the world, there are almost no data on the current status of populations, threat assessment and species-specific in-situ conservation. Common angel shark is still present in highly fragmented areas of the eastern Adriatic with extremely rare but consistent records, while smoothback angel shark is mostly considered regionally extinct in the Adriatic due to overfishing and overuse of non-selective fishing gear. There have been only 3 published records of common angel shark this century, the last two of which were reported by fishermen. This paper presents data on 34 new finds, including neonates, juveniles, subadults and adults recorded between January 2020 and August 2021 in the Zadar-Šibenik archipelago (central Adriatic) and one in Premantura (northern Adriatic). Two are original findings during the field expedition, 9 were reported directly by local fishermen, while 23 were reported through a detailed questionnaire. Additionally, plausible breeding and/or nursery grounds between Zadar and Šibenik are discussed with their importance for revitalization and long-term conservation in situ.
{"title":"New Hope for the Critically Endangered Common Angel Shark Squatina squatina in the Adriatic Sea","authors":"A. Gajić","doi":"10.2478/cjf-2022-0001","DOIUrl":"https://doi.org/10.2478/cjf-2022-0001","url":null,"abstract":"Abstract Historically, two angel shark species, common angel shark Squatina squatina and smoothback angel shark Squatina oculata, were common in the upper continental shelf of the eastern Adriatic Sea. Although both species are considered critically endangered in the Adriatic and the rest of the world, there are almost no data on the current status of populations, threat assessment and species-specific in-situ conservation. Common angel shark is still present in highly fragmented areas of the eastern Adriatic with extremely rare but consistent records, while smoothback angel shark is mostly considered regionally extinct in the Adriatic due to overfishing and overuse of non-selective fishing gear. There have been only 3 published records of common angel shark this century, the last two of which were reported by fishermen. This paper presents data on 34 new finds, including neonates, juveniles, subadults and adults recorded between January 2020 and August 2021 in the Zadar-Šibenik archipelago (central Adriatic) and one in Premantura (northern Adriatic). Two are original findings during the field expedition, 9 were reported directly by local fishermen, while 23 were reported through a detailed questionnaire. Additionally, plausible breeding and/or nursery grounds between Zadar and Šibenik are discussed with their importance for revitalization and long-term conservation in situ.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"80 1","pages":"1 - 6"},"PeriodicalIF":0.0,"publicationDate":"2022-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46527258","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. Kamberi, Kristian Beqiri, Kristjan Luli, R. Bakiu
Abstract Evidence from the last two centuries has identified changes in the biodiversity of the Mediterranean basin triggered by the arrival of new species. Compared to the central and northern areas, the southern part of the Adriatic Sea, specifically the Albanian coast, has been less studied. The aim of this study is to evaluate the prevalence of new/non-native fish species on the north Albanian coast in order to provide the first data on their presence. Data collection was carried out from March to August 2019 using LEK (Local Ecological Knowledge) protocol in five different locations along the northern part of the Albanian coast. The research followed a predefined methodology previously successfully applied in different countries of the Mediterranean basin by using a semi-structured questionnaire. During this study, 9 new and non-native species were recognized by the fishers, while only 5 of them have shown an evident abundance increase based on their respective catches in recent years. Results suggest that some of the analyzed species, such as blue crab Callinectes sapidus and bluefish Pomatomus saltatrix, represent important members of the fish fauna in north Albania coastal waters (including the lagoons). Future studies regarding the assessment of their impact and management strategies are highly recommended.
{"title":"Tracking Changes in Fish Diversity in the South-Eastern Adriatic Sea (Albania) Based on Local Ecological Knowledge","authors":"E. Kamberi, Kristian Beqiri, Kristjan Luli, R. Bakiu","doi":"10.2478/cjf-2022-0003","DOIUrl":"https://doi.org/10.2478/cjf-2022-0003","url":null,"abstract":"Abstract Evidence from the last two centuries has identified changes in the biodiversity of the Mediterranean basin triggered by the arrival of new species. Compared to the central and northern areas, the southern part of the Adriatic Sea, specifically the Albanian coast, has been less studied. The aim of this study is to evaluate the prevalence of new/non-native fish species on the north Albanian coast in order to provide the first data on their presence. Data collection was carried out from March to August 2019 using LEK (Local Ecological Knowledge) protocol in five different locations along the northern part of the Albanian coast. The research followed a predefined methodology previously successfully applied in different countries of the Mediterranean basin by using a semi-structured questionnaire. During this study, 9 new and non-native species were recognized by the fishers, while only 5 of them have shown an evident abundance increase based on their respective catches in recent years. Results suggest that some of the analyzed species, such as blue crab Callinectes sapidus and bluefish Pomatomus saltatrix, represent important members of the fish fauna in north Albania coastal waters (including the lagoons). Future studies regarding the assessment of their impact and management strategies are highly recommended.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"80 1","pages":"17 - 25"},"PeriodicalIF":0.0,"publicationDate":"2022-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49396845","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}
Abstract Underwater visual census (UVC) is a commonly used approach for assessing fish density and biomass. Iskenderun Bay, comprising the Samandağ coast in Turkey, is the most important introduction pathway of alien species in the northeastern Mediterranean. In this study, the density, abundance, distribution and interaction of invasive lionfish or devil firefish Pterois miles were assessed using the UVC method on the Samandağ coast. The total transect area monitored on the Samandağ coast was 4.500 m2. Species richness, Shannon’s diversity index and rate of biomass were 25, 1.81 and 73.5 m2, respectively. Reduced diversity was observed with increasing depths. The sandy seafloor was a limiting factor for lionfish distribution. There was a significant positive correlation between lionfish total density and both the Shannon diversity index (r = 0.99, P<0.001) and Shannon evenness index (r = 0.99, P<0.05). A high number of significant positive correlations (P<0.05) were detected between the occurrence of lionfish and the occurrence of both the native species and other alien species. The first stock assessment study of lionfish by the UVC method in Turkish marine waters revealed that native species are under very high pressure from lionfish species, especially Chromis, Sparids and Wrasses, indicating negative effects of lionfish on regional native biodiversity.
{"title":"Preliminary Assessment of Invasive Lionfish Pterois miles Using Underwater Visual Census Method in the Northeastern Mediterranean","authors":"C. Turan, S. Doğdu","doi":"10.2478/cjf-2022-0005","DOIUrl":"https://doi.org/10.2478/cjf-2022-0005","url":null,"abstract":"Abstract Underwater visual census (UVC) is a commonly used approach for assessing fish density and biomass. Iskenderun Bay, comprising the Samandağ coast in Turkey, is the most important introduction pathway of alien species in the northeastern Mediterranean. In this study, the density, abundance, distribution and interaction of invasive lionfish or devil firefish Pterois miles were assessed using the UVC method on the Samandağ coast. The total transect area monitored on the Samandağ coast was 4.500 m2. Species richness, Shannon’s diversity index and rate of biomass were 25, 1.81 and 73.5 m2, respectively. Reduced diversity was observed with increasing depths. The sandy seafloor was a limiting factor for lionfish distribution. There was a significant positive correlation between lionfish total density and both the Shannon diversity index (r = 0.99, P<0.001) and Shannon evenness index (r = 0.99, P<0.05). A high number of significant positive correlations (P<0.05) were detected between the occurrence of lionfish and the occurrence of both the native species and other alien species. The first stock assessment study of lionfish by the UVC method in Turkish marine waters revealed that native species are under very high pressure from lionfish species, especially Chromis, Sparids and Wrasses, indicating negative effects of lionfish on regional native biodiversity.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"80 1","pages":"38 - 46"},"PeriodicalIF":0.0,"publicationDate":"2022-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43812107","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}
Marina Ferfolja, M. Cerjak, D. Matulić, M. T. Maksan
Abstract Along with growing consumer awareness about the impact of food on health, there is a trend towards increasing fresh fish consumption. At the same time, the demand for organic food is increasing in the modern market. Although fruits, vegetables and nuts have the biggest share in the organic food market in Europe, the aquaculture production of organic fish is also growing. Therefore, the main aim of this study is to explore the knowledge and perception of Croatian consumers about fresh fish from organic farming. An online and face-to-face survey was conducted on a sample of 303 respondents. Data analysis (univariate and bivariate) was performed using SPSS Statistics for Windows. Most consumers have medium and low subjective knowledge about fresh fish from organic farming, and objective knowledge about fresh fish from organic farming is low. Only half of the consumers are aware that they can buy fresh fish from organic farming in the domestic market. Half of the consumers have already consumed fresh organic fish, and half are willing to pay a higher price for fresh fish from organic farming. Compared to fresh fish from conventional farming, respondents consider fresh organic fish to be healthier, tastier and to have less fat, but also more expensive and less available.
摘要随着消费者越来越意识到食物对健康的影响，鲜鱼的消费量也有增加的趋势。与此同时，现代市场对有机食品的需求也在增加。尽管水果、蔬菜和坚果在欧洲有机食品市场上占有最大份额，但有机鱼类的水产养殖产量也在增长。因此，本研究的主要目的是探索克罗地亚消费者对有机养殖鲜鱼的了解和看法。对303名受访者进行了在线和面对面调查。使用SPSS Statistics for Windows进行数据分析（单变量和双变量）。大多数消费者对有机养殖鲜鱼的主观认识处于中低水平，对有机养殖的鲜鱼的客观认识较低。只有一半的消费者知道他们可以在国内市场上购买有机养殖的鲜鱼。一半的消费者已经食用了新鲜的有机鱼，一半的消费者愿意为有机养殖的新鲜鱼支付更高的价格。与传统养殖的鲜鱼相比，受访者认为新鲜的有机鱼更健康、更美味、脂肪更少，但也更昂贵、供应更少。
{"title":"Consumer Knowledge and Perception about Fresh Fish from Organic Farming in Croatia","authors":"Marina Ferfolja, M. Cerjak, D. Matulić, M. T. Maksan","doi":"10.2478/cjf-2022-0002","DOIUrl":"https://doi.org/10.2478/cjf-2022-0002","url":null,"abstract":"Abstract Along with growing consumer awareness about the impact of food on health, there is a trend towards increasing fresh fish consumption. At the same time, the demand for organic food is increasing in the modern market. Although fruits, vegetables and nuts have the biggest share in the organic food market in Europe, the aquaculture production of organic fish is also growing. Therefore, the main aim of this study is to explore the knowledge and perception of Croatian consumers about fresh fish from organic farming. An online and face-to-face survey was conducted on a sample of 303 respondents. Data analysis (univariate and bivariate) was performed using SPSS Statistics for Windows. Most consumers have medium and low subjective knowledge about fresh fish from organic farming, and objective knowledge about fresh fish from organic farming is low. Only half of the consumers are aware that they can buy fresh fish from organic farming in the domestic market. Half of the consumers have already consumed fresh organic fish, and half are willing to pay a higher price for fresh fish from organic farming. Compared to fresh fish from conventional farming, respondents consider fresh organic fish to be healthier, tastier and to have less fat, but also more expensive and less available.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"80 1","pages":"7 - 16"},"PeriodicalIF":0.0,"publicationDate":"2022-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41437315","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}
R. Bakiu, Dimitrios K. Moutopoulos, M. Gurma, M. Çakalli
Abstract The lack of reliable fisheries statistics hampers full assessment of the status of marine resources. Central to this problem are data-poor fisheries such as the Albanian seas and in particular the SSF sector. The present study aims to portray the small-scale fishery of south Albanian waters based on daily onboard monitoring of fisheries species catches during a two-year period (2016-2018). Results revealed a total of 6 and 11 fishing métiers for the nets and longlines, respectively. The most important target species for nets in terms of catches were Merluccius merluccius, Mullus surmuletus, Pagellus erythrinus, Sepia officinalis and Solea vulgaris. Longline fisheries were categorized into two distinct fishing métiers, one targeting the large pelagics Thunnus thynnus and Xiphias gladius, and the other targeting a wide range of Sparidae species and Epinephelus marginatus. The data and analysis presented here aim to reduce the current lack of quantitative data on a fisheries data-limited case such as the Albanian small-scale fishery and to provide information for developing monitoring for this fishery.
{"title":"Typology of the Albanian Small-Scale Fisheries","authors":"R. Bakiu, Dimitrios K. Moutopoulos, M. Gurma, M. Çakalli","doi":"10.2478/cjf-2022-0004","DOIUrl":"https://doi.org/10.2478/cjf-2022-0004","url":null,"abstract":"Abstract The lack of reliable fisheries statistics hampers full assessment of the status of marine resources. Central to this problem are data-poor fisheries such as the Albanian seas and in particular the SSF sector. The present study aims to portray the small-scale fishery of south Albanian waters based on daily onboard monitoring of fisheries species catches during a two-year period (2016-2018). Results revealed a total of 6 and 11 fishing métiers for the nets and longlines, respectively. The most important target species for nets in terms of catches were Merluccius merluccius, Mullus surmuletus, Pagellus erythrinus, Sepia officinalis and Solea vulgaris. Longline fisheries were categorized into two distinct fishing métiers, one targeting the large pelagics Thunnus thynnus and Xiphias gladius, and the other targeting a wide range of Sparidae species and Epinephelus marginatus. The data and analysis presented here aim to reduce the current lack of quantitative data on a fisheries data-limited case such as the Albanian small-scale fishery and to provide information for developing monitoring for this fishery.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"80 1","pages":"26 - 37"},"PeriodicalIF":0.0,"publicationDate":"2022-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48199659","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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