Abstract A specimen of common thresher shark Alopias vulpinus (Bonnaterre 1788) was caught in a fishing net in the waters off Piran (Gulf of Trieste, northern Adriatic Sea). It was a juvenile male with a total length of 2841 mm. In recent decades, other cases of juvenile specimens of common thresher shark have been recorded in Slovenian coastal waters. Despite the drastic decline in the population of this species, thresher shark continues to be caught in local Adriatic fisheries.
{"title":"Note on a Juvenile Common Thresher Shark <i>Alopias vulpinus</i> (Bonnaterre 1788) in the waters of Slovenia (Northern Adriatic Sea)","authors":"Lovrenc Lipej, Leon L. Zamuda, Borut Mavrič","doi":"10.2478/cjf-2023-0020","DOIUrl":"https://doi.org/10.2478/cjf-2023-0020","url":null,"abstract":"Abstract A specimen of common thresher shark Alopias vulpinus (Bonnaterre 1788) was caught in a fishing net in the waters off Piran (Gulf of Trieste, northern Adriatic Sea). It was a juvenile male with a total length of 2841 mm. In recent decades, other cases of juvenile specimens of common thresher shark have been recorded in Slovenian coastal waters. Despite the drastic decline in the population of this species, thresher shark continues to be caught in local Adriatic fisheries.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"2 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134957031","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 As an endemic species, Dalmatian barbelgudgeon was introduced into Šatorsko Lake, but it was insufficiently explored at this locality. The aim of this study was to determine seasonal variations of physicochemical parameters of the water in relation to morphometric and hematological parameters of Dalmatian barbelgudgeon from Šatorsko Lake. Physicochemical analysis of the water recorded lower values of temperature, O 2 concentration, O 2 saturation, electrolytic conductivity and suspended matter in autumn, while other analyzed parameters indicated lower values in spring. The analysis of morphometric parameters (weight, standard length, total length and Fulton’s condition factor) determined higher values of all the parameters during spring, while a significant difference was noted only for Fulton’s condition factor. A statistically significant difference was observed for all erythrocyte lineage parameters (RBC-red blood cells, HB-hemoglobin concentration, HCT-hematocrit, MCV-mean corpuscular volume, MCH-mean corpuscular hemoglobin, MCHC-mean corpuscular hemoglobin concentrations). In white blood cells, a statistically significant difference was recorded for lymphocytes, non-segmented neutrophils and monocytes, while the proportion of segmented neutrophils and basophils was slightly increased in spring. Furthermore, the recorded values of pseudo-eosinophils were equal in spring and autumn. The results of these studies indicate a significant influence of exogenous and endogenous factors on the variability of morphometric and hematological parameters of Dalmatian barbelgudgeon from Šatorsko Lake.
{"title":"Seasonal Variations of Morphometric and Hematological Parameters in Dalmatian Barbelgudgeon <i>Aulopyge huegelii</i> Heckel 1843 from Šatorsko Lake","authors":"Subha Avdić, Azra Bakrač, Avdul Adrović, Edina Hajdarević, Radoslav Dekić, Maida Delić","doi":"10.2478/cjf-2023-0017","DOIUrl":"https://doi.org/10.2478/cjf-2023-0017","url":null,"abstract":"Abstract As an endemic species, Dalmatian barbelgudgeon was introduced into Šatorsko Lake, but it was insufficiently explored at this locality. The aim of this study was to determine seasonal variations of physicochemical parameters of the water in relation to morphometric and hematological parameters of Dalmatian barbelgudgeon from Šatorsko Lake. Physicochemical analysis of the water recorded lower values of temperature, O 2 concentration, O 2 saturation, electrolytic conductivity and suspended matter in autumn, while other analyzed parameters indicated lower values in spring. The analysis of morphometric parameters (weight, standard length, total length and Fulton’s condition factor) determined higher values of all the parameters during spring, while a significant difference was noted only for Fulton’s condition factor. A statistically significant difference was observed for all erythrocyte lineage parameters (RBC-red blood cells, HB-hemoglobin concentration, HCT-hematocrit, MCV-mean corpuscular volume, MCH-mean corpuscular hemoglobin, MCHC-mean corpuscular hemoglobin concentrations). In white blood cells, a statistically significant difference was recorded for lymphocytes, non-segmented neutrophils and monocytes, while the proportion of segmented neutrophils and basophils was slightly increased in spring. Furthermore, the recorded values of pseudo-eosinophils were equal in spring and autumn. The results of these studies indicate a significant influence of exogenous and endogenous factors on the variability of morphometric and hematological parameters of Dalmatian barbelgudgeon from Šatorsko Lake.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"7 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134957172","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 This study is the first contribution to monitoring the rearing of common meagre Argyrosomus regius in floating cages anchored in Dakhla Bay, southern Morocco. The aquaculture potential of common meagre in Dakhla Bay was evaluated by zootechnical monitoring of two production cycles. The first batch consisted of 20,000 fingerlings of 4.5 ± 0.13 g in mean initial weight and 6±0.19 cm in fork length, and was caught on 26 August 2019 under a condition factor of about 2.08 ± 0.35. The second batch consisted of 30,000 individuals of 3 ± 0.11 g in average initial weight and 6±0.26 cm in average initial length, and was caught on 4 June 2020 under a condition factor of about 1.39 ± 0.21. During the first experiment, which lasted 16 months, a high growth potential of common meagre was observed. The fish reached an average weight of 1265 ± 69.2 g and an average length of 48±4.32 cm with a specific growth rate (SGR) of 0.58 ± 0.11% day-1 and a daily growth index DGI of 2.45 ± 0.91 g ind-1 day-1. The feed conversion ratio was 1.18 (FER = 0.84), final density was 36.94 kg m-3 and condition factor (k) recorded a mean value of 2.18±0.39 throughout the cycle. The survival rate at the first harvest was 89.86%. After 18 months of rearing, the fish of the second cycle reached a weight of 1285±69.2 g and a size of 47 ± 5.36 cm, with an SGR of 0.49 ± 0.12 % day-1 and a DGI of 2.34 ± 1.35 g ind-1 day-1, an FCR of 1.21 (FER =0.83), the final density of 28.43 kg m-3 and a condition factor of 1.35 ± 0.32. The survival rate was 92.19%. However, the results of the statistical analysis showed that there was no significant difference between the two production cycles (P > 0.05). These results confirm that common meagre is a very promising species for the diversification of aquaculture in Dakhla Bay and throughout Morocco.
摘要本研究是对摩洛哥南部Dakhla湾固定浮式网箱中普通贫沙蚕(Argyrosomus regius)养殖的首次监测。通过两个生产周期的动物技术监测，评价了达喀尔湾普通鳕鱼的养殖潜力。第一批鱼种2万尾，平均初始体重4.5±0.13 g，鱼叉长6±0.19 cm，于2019年8月26日在2.08±0.35的条件因子下捕获。第二批共3万条，平均初始体重3±0.11 g，平均初始长度6±0.26 cm，于2020年6月4日捕获，条件因子约为1.39±0.21。在第一次16个月的试验中，观察到普通马铃薯有很高的生长潜力。平均体重1265±69.2 g，平均体长48±4.32 cm，特定生长率(SGR) 0.58±0.11% d -1，日生长指数DGI为2.45±0.91 g d -1 d -1。饲料系数为1.18 (FER = 0.84)，最终密度为36.94 kg m -3，整个周期的条件因子(k)平均值为2.18±0.39。第一次收获成活率为89.86%。饲养18个月后，第二周期的鱼重1285±69.2 g，体长47±5.36 cm, SGR为0.49±0.12% day -1, DGI为2.34±1.35 g ind -1 day -1, FCR为1.21 (FER =0.83)，最终密度为28.43 kg m -3，条件因子为1.35±0.32。生存率为92.19%。然而，统计分析结果显示，两个生产周期之间没有显著差异(P >0.05)。这些结果证实，在Dakhla湾和整个摩洛哥，普通贫鱼是一种非常有希望实现水产养殖多样化的物种。
{"title":"Biotechnical Aspects of Aquaculture Production of Common Meagre <i>Argyrosomus regius</i> in Floating Cages in Dakhla Bay, Morocco","authors":"Omar Izzabaha, Abderrahim Gjije, Ayoub Bounacir, Mustapha Ait Chattou, Mohamed Idhalla, Hicham Chairi","doi":"10.2478/cjf-2023-0016","DOIUrl":"https://doi.org/10.2478/cjf-2023-0016","url":null,"abstract":"Abstract This study is the first contribution to monitoring the rearing of common meagre Argyrosomus regius in floating cages anchored in Dakhla Bay, southern Morocco. The aquaculture potential of common meagre in Dakhla Bay was evaluated by zootechnical monitoring of two production cycles. The first batch consisted of 20,000 fingerlings of 4.5 ± 0.13 g in mean initial weight and 6±0.19 cm in fork length, and was caught on 26 August 2019 under a condition factor of about 2.08 ± 0.35. The second batch consisted of 30,000 individuals of 3 ± 0.11 g in average initial weight and 6±0.26 cm in average initial length, and was caught on 4 June 2020 under a condition factor of about 1.39 ± 0.21. During the first experiment, which lasted 16 months, a high growth potential of common meagre was observed. The fish reached an average weight of 1265 ± 69.2 g and an average length of 48±4.32 cm with a specific growth rate (SGR) of 0.58 ± 0.11% day-1 and a daily growth index DGI of 2.45 ± 0.91 g ind-1 day-1. The feed conversion ratio was 1.18 (FER = 0.84), final density was 36.94 kg m-3 and condition factor (k) recorded a mean value of 2.18±0.39 throughout the cycle. The survival rate at the first harvest was 89.86%. After 18 months of rearing, the fish of the second cycle reached a weight of 1285±69.2 g and a size of 47 ± 5.36 cm, with an SGR of 0.49 ± 0.12 % day-1 and a DGI of 2.34 ± 1.35 g ind-1 day-1, an FCR of 1.21 (FER =0.83), the final density of 28.43 kg m-3 and a condition factor of 1.35 ± 0.32. The survival rate was 92.19%. However, the results of the statistical analysis showed that there was no significant difference between the two production cycles (P > 0.05). These results confirm that common meagre is a very promising species for the diversification of aquaculture in Dakhla Bay and throughout Morocco.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134957316","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 Round goby Neogobius melanostomus is one of the three invasive Ponto-Caspian gobies found in the Sava River basin in Croatia. It has a negative effect on the native ecosystems and is more abundant in highly polluted areas. The objective of this study was to determine the fluctuating asymmetry of four morphometric characters, as well as otolith width and length. Thirty individuals of N. melanostomus were collected and analysed at two sampling sites in the main course of the Sava (Babina Greda, Slavonski Brod) and in a modified habitat (Sava-Odra canal). The squared coefficient of asymmetry variation was used to analyse potential differences between populations. We identified variations in the asymmetry values of the analysed characters, as well as otolith width and length between sampling sites. The highest fluctuating asymmetry was observed in individuals at the Babina Greda sampling site, which could be due to high environmental stress. The results of the study show that the study of fluctuating asymmetry can be used on invasive fish species as a simple approach to identifying habitat quality.
{"title":"Fluctuating Asymmetry in Morphological Characters of the Invasive Round Goby <i>Neogobius melanostomus</i> Populations from Different Habitats of the Sava River Basin, Croatia","authors":"Valentine Planchet, Ivan Špelić, Marina Piria","doi":"10.2478/cjf-2023-0018","DOIUrl":"https://doi.org/10.2478/cjf-2023-0018","url":null,"abstract":"Abstract Round goby Neogobius melanostomus is one of the three invasive Ponto-Caspian gobies found in the Sava River basin in Croatia. It has a negative effect on the native ecosystems and is more abundant in highly polluted areas. The objective of this study was to determine the fluctuating asymmetry of four morphometric characters, as well as otolith width and length. Thirty individuals of N. melanostomus were collected and analysed at two sampling sites in the main course of the Sava (Babina Greda, Slavonski Brod) and in a modified habitat (Sava-Odra canal). The squared coefficient of asymmetry variation was used to analyse potential differences between populations. We identified variations in the asymmetry values of the analysed characters, as well as otolith width and length between sampling sites. The highest fluctuating asymmetry was observed in individuals at the Babina Greda sampling site, which could be due to high environmental stress. The results of the study show that the study of fluctuating asymmetry can be used on invasive fish species as a simple approach to identifying habitat quality.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"7 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134957174","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 Goonch Bagarius bagarius (Hamilton, 1822) is one of the largest and fastest-growing catfish of the Indus River found at Taunsa Barrage, Pakistan. The full-length cDNA of the growth hormone gene (600 bp) was amplified by reverse transcription of mRNA isolated from the pituitary gland of B. bagarius . The full-length growth hormone gene encodes a putative polypeptide of 200 amino acids with a molecular mass of 22.58 kDa. The precursor of B. bagarius growth hormone (GH) is composed of 22 amino acids as a signal peptide and 178 amino acids of a mature peptide. There were six conserved Cys residues in GH protein (20, 71, 135, 173, 190 and 198) that maintain the structural integrity of this protein. One putative N-glycosylation site was present at the 197 th amino acid. The total number of positively charged (Arg and Lys) and negatively charged (Asp and Glu) residues is 42 and 31, respectively. The B. bagarius GH gene shows more than 90% sequence homology with other catfishes. The mature protein GH gene was expressed in Escherichia coli using pET-28 expression vector, and the recombinant protein of 19.5 kDa was detected through SDS-PAGE analysis. This study suggests that cloning and expression of B. bagarius GH gene would provide basic information for transgenic studies aimed at a faster growth rate. This recombinant GH may be produced on a large scale to exploit its growth-promoting function in other cultured fishes.
{"title":"Cloning, Sequencing and Expression of Goonch <i>Bagarius bagarius</i> (Hamilton, 1822) Growth Hormone","authors":"Haji Muhammad, Qamar Bashir","doi":"10.2478/cjf-2023-0019","DOIUrl":"https://doi.org/10.2478/cjf-2023-0019","url":null,"abstract":"Abstract Goonch Bagarius bagarius (Hamilton, 1822) is one of the largest and fastest-growing catfish of the Indus River found at Taunsa Barrage, Pakistan. The full-length cDNA of the growth hormone gene (600 bp) was amplified by reverse transcription of mRNA isolated from the pituitary gland of B. bagarius . The full-length growth hormone gene encodes a putative polypeptide of 200 amino acids with a molecular mass of 22.58 kDa. The precursor of B. bagarius growth hormone (GH) is composed of 22 amino acids as a signal peptide and 178 amino acids of a mature peptide. There were six conserved Cys residues in GH protein (20, 71, 135, 173, 190 and 198) that maintain the structural integrity of this protein. One putative N-glycosylation site was present at the 197 th amino acid. The total number of positively charged (Arg and Lys) and negatively charged (Asp and Glu) residues is 42 and 31, respectively. The B. bagarius GH gene shows more than 90% sequence homology with other catfishes. The mature protein GH gene was expressed in Escherichia coli using pET-28 expression vector, and the recombinant protein of 19.5 kDa was detected through SDS-PAGE analysis. This study suggests that cloning and expression of B. bagarius GH gene would provide basic information for transgenic studies aimed at a faster growth rate. This recombinant GH may be produced on a large scale to exploit its growth-promoting function in other cultured fishes.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134957176","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}
Newton Saha, Prosun Roy, Tanmoy Sarkar Utsha, Sudipta Kumar Nag, Gitartha Kaushik, M. Hossain
Abstract The near-threatened Ailia coila, commonly referred to as Gangetic ailia, is a catfish species in the Ailiidae family that is indigenous to Bangladesh, Pakistan, Nepal, and India. This study describes the comprehensive explanation of life-history traits of Ailia coila, including length-frequency distribution (LFD), growth pattern (length-weight relationships, LWRs and length-length relationship, LLR), form factor (a3.0), condition factors (allometric, KA; Fulton’s, KF; relative, KR and relative weight, WR), size at first sexual maturity (Lm), optimum catchable length (Lopt) and natural mortality (Mw) from the Tetulia River in southern Bangladesh. Additionally, Lα, a3.0, Lm, Mw and Lopt from various water bodies worldwide using the existing literature were calculated in this study. A total of 316 samples were randomly collected occasionally using traditional gear for a year from July 2021 to June 2022. With an accuracy of 0.01 cm and 0.01 g, each fish’s total length (TL), standard length (SL), and body weight (BW) were measured. The group from 10.00 to 10.99 cm TL was numerically leading and the b values of LWRs indicate positive allometric growth. The a3.0 was 0.005 and KF was the best for assessing the well-being of A. coila. Additionally, WR indicates that the habitat was imbalanced with higher predators. The calculated Lm, Lopt and Mw were 9.19 (~ 9.2 cm TL), 10.7 cm TL and 1.37 year−1 for A. coila in the Tetulia River, respectively. These insights are vital for future research and recommending suitable management strategies for A. coila in the Tetulia River and neighboring basins.
摘要近危Ailia coia，通常被称为Gangetic Ailia，是Ailiidae科的一种鲶鱼，原产于孟加拉国、巴基斯坦、尼泊尔和印度。本研究综合解释了Ailia coia的生活史特征，包括长频分布（LFD）、生长模式（长重关系、LWRs和长长长关系，LLR）、形态因子（a3.0）、条件因子（异速生长，KA；富尔顿氏，KF；相对，KR和相对重量，WR）、第一性成熟时的大小（Lm），孟加拉国南部Tetulia河的最佳可捕长度（Lopt）和自然死亡率（Mw）。此外，本研究还使用现有文献计算了世界各地不同水体的Lα、a3.0、Lm、Mw和Lopt。从2021年7月到2022年6月，在一年的时间里，偶尔使用传统齿轮随机采集了316个样本。以0.01厘米和0.01克的精度，测量每条鱼的总长度（TL）、标准长度（SL）和体重（BW）。从10.00到10.99 cm TL的组在数值上领先，LWR的b值表示正异速生长。a3.0为0.005，KF是评价A.coia健康状况的最佳指标。此外，WR表明栖息地与较高的捕食者不平衡。Tetulia河中A.coia的计算Lm、Lopt和Mw分别为9.19（~9.2cm TL）、10.7cm TL和1.37年-1。这些见解对于未来的研究和为特图利亚河及其邻近流域的A.coia推荐合适的管理策略至关重要。
{"title":"Life History Traits of Gangetic Ailia Ailia coila (Hamilton 1822) in the Tetulia River, Southern Bangladesh","authors":"Newton Saha, Prosun Roy, Tanmoy Sarkar Utsha, Sudipta Kumar Nag, Gitartha Kaushik, M. Hossain","doi":"10.2478/cjf-2023-0013","DOIUrl":"https://doi.org/10.2478/cjf-2023-0013","url":null,"abstract":"Abstract The near-threatened Ailia coila, commonly referred to as Gangetic ailia, is a catfish species in the Ailiidae family that is indigenous to Bangladesh, Pakistan, Nepal, and India. This study describes the comprehensive explanation of life-history traits of Ailia coila, including length-frequency distribution (LFD), growth pattern (length-weight relationships, LWRs and length-length relationship, LLR), form factor (a3.0), condition factors (allometric, KA; Fulton’s, KF; relative, KR and relative weight, WR), size at first sexual maturity (Lm), optimum catchable length (Lopt) and natural mortality (Mw) from the Tetulia River in southern Bangladesh. Additionally, Lα, a3.0, Lm, Mw and Lopt from various water bodies worldwide using the existing literature were calculated in this study. A total of 316 samples were randomly collected occasionally using traditional gear for a year from July 2021 to June 2022. With an accuracy of 0.01 cm and 0.01 g, each fish’s total length (TL), standard length (SL), and body weight (BW) were measured. The group from 10.00 to 10.99 cm TL was numerically leading and the b values of LWRs indicate positive allometric growth. The a3.0 was 0.005 and KF was the best for assessing the well-being of A. coila. Additionally, WR indicates that the habitat was imbalanced with higher predators. The calculated Lm, Lopt and Mw were 9.19 (~ 9.2 cm TL), 10.7 cm TL and 1.37 year−1 for A. coila in the Tetulia River, respectively. These insights are vital for future research and recommending suitable management strategies for A. coila in the Tetulia River and neighboring basins.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"81 1","pages":"115 - 126"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46556013","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 Round goby Neogobius melanostomus is one of the three invasive Ponto-Caspian gobies found in the Sava River basin in Croatia. It has a negative effect on the native ecosystems due to its high invasive potential that enables its rapid spread upstream in inland watercourses. The objective of this study was to determine the differences in sagittal otolith and scale shape of the frontal and established populations of N. melanostomus in two different habitat types. At two sampling sites in the main course of the Sava (Babina Greda, Slavonski Brod) and in a modified habitat (Sava-Odra canal), 20 individuals of N. melanostomus were collected and analysed. The geometric morphometric method was used together with Procrustes analysis of variance, canonical variate analysis and discriminant function analysis to analyse the otolith and scale shape. Significant differences in both otolith and scale shapes were found between settled (Babina Greda) and frontal (Slavonski Brod) populations from the main course of the Sava River. The main differences were the wider anterior part of the scales and a more pronounced open indentation on the otolith of the Babina Greda population. The settled population in the Sava-Odra canal was significantly different in otolith shape from the Babina Greda population but not from the Slavonski Brod population, suggesting that the upstream migration consisted of individuals with specific phenotype and genotype. Otoliths generally expressed greater shape variability than scales and thus may be more useful for differentiating between closely related populations on a finer scale. The results of this study suggest that the shape of otoliths and scales can be used to distinguish between closely related populations of N. melanostomus from different habitats but more comprehensive studies are needed due to the small number of samples.
{"title":"Variations in Otolith and Scale Shape of the Invasive Round Goby Neogobius melanostomus Populations from Different Habitats of the Sava River Basin, Croatia","authors":"Valentine Planchet, Ivan Špelić, M. Piria","doi":"10.2478/cjf-2023-0011","DOIUrl":"https://doi.org/10.2478/cjf-2023-0011","url":null,"abstract":"Abstract Round goby Neogobius melanostomus is one of the three invasive Ponto-Caspian gobies found in the Sava River basin in Croatia. It has a negative effect on the native ecosystems due to its high invasive potential that enables its rapid spread upstream in inland watercourses. The objective of this study was to determine the differences in sagittal otolith and scale shape of the frontal and established populations of N. melanostomus in two different habitat types. At two sampling sites in the main course of the Sava (Babina Greda, Slavonski Brod) and in a modified habitat (Sava-Odra canal), 20 individuals of N. melanostomus were collected and analysed. The geometric morphometric method was used together with Procrustes analysis of variance, canonical variate analysis and discriminant function analysis to analyse the otolith and scale shape. Significant differences in both otolith and scale shapes were found between settled (Babina Greda) and frontal (Slavonski Brod) populations from the main course of the Sava River. The main differences were the wider anterior part of the scales and a more pronounced open indentation on the otolith of the Babina Greda population. The settled population in the Sava-Odra canal was significantly different in otolith shape from the Babina Greda population but not from the Slavonski Brod population, suggesting that the upstream migration consisted of individuals with specific phenotype and genotype. Otoliths generally expressed greater shape variability than scales and thus may be more useful for differentiating between closely related populations on a finer scale. The results of this study suggest that the shape of otoliths and scales can be used to distinguish between closely related populations of N. melanostomus from different habitats but more comprehensive studies are needed due to the small number of samples.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"81 1","pages":"93 - 101"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45598416","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 Season and water quality are essential indicators in the life cycle of pond ecosystems. The season is a natural factor affecting the level of water quality dynamics in shrimp cultivation in ponds. This study aims to evaluate the dynamics of differences in water quality parameters in intensive Litopenaeus vannamei ponds during dry and rainy seasons. This current study applied an ex post facto causal design based on actual field conditions. During the rainy season, water quality parameters tended to fluctuate dynamically, with the parameters of phosphate (PO4), nitrite (NO2), and total organic matter (TOM) exceeding the threshold value of water quality standards for aquaculture, with a PO4 value of 0.734 mg/L, a NO2 of 0.180 mg/L, and a TOM of 101.29 mg/L. In the dry season, water quality parameters remained stable, with only the phosphate parameter showing a value above the water quality standard threshold of 0.633 mg/L. Based on the trend of fluctuations in the two seasons, a model of equation Y = 3.979 + 0.814x was made with a significance value <α (0.05), which means that the two seasons positively correlated with the impact on fluctuations of water quality in the ponds. The results of the dynamic modelling analysis showed contradictions in water quality and nutrients during rainy and dry seasons. Water quality parameters in intensive L. vannamei cultivation during dry and rainy seasons fluctuated dynamically and differed according to the type of weather conditions and the current season.
{"title":"Water Quality Fluctuations in Shrimp Ponds During Dry and Rainy Seasons","authors":"H. Ariadi, Muh. Azril, Tholibah Mujtahidah","doi":"10.2478/cjf-2023-0014","DOIUrl":"https://doi.org/10.2478/cjf-2023-0014","url":null,"abstract":"Abstract Season and water quality are essential indicators in the life cycle of pond ecosystems. The season is a natural factor affecting the level of water quality dynamics in shrimp cultivation in ponds. This study aims to evaluate the dynamics of differences in water quality parameters in intensive Litopenaeus vannamei ponds during dry and rainy seasons. This current study applied an ex post facto causal design based on actual field conditions. During the rainy season, water quality parameters tended to fluctuate dynamically, with the parameters of phosphate (PO4), nitrite (NO2), and total organic matter (TOM) exceeding the threshold value of water quality standards for aquaculture, with a PO4 value of 0.734 mg/L, a NO2 of 0.180 mg/L, and a TOM of 101.29 mg/L. In the dry season, water quality parameters remained stable, with only the phosphate parameter showing a value above the water quality standard threshold of 0.633 mg/L. Based on the trend of fluctuations in the two seasons, a model of equation Y = 3.979 + 0.814x was made with a significance value <α (0.05), which means that the two seasons positively correlated with the impact on fluctuations of water quality in the ponds. The results of the dynamic modelling analysis showed contradictions in water quality and nutrients during rainy and dry seasons. Water quality parameters in intensive L. vannamei cultivation during dry and rainy seasons fluctuated dynamically and differed according to the type of weather conditions and the current season.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"81 1","pages":"127 - 137"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45694422","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 current study provides valuable insight into the trawl fishery operating in southern Albanian waters via an integrated approach based on high-frequency onboard monitoring trawl vessels and on-site interviews with local fishers. Multivariate analyses of the composition of species landings or economic revenue revealed groups that, depending on the group, were distinguished by improved fisheries landings and economic efficiency. The majority of the catch consisted of a variety of demersal and small- and medium-sized pelagic species, confirming the Adriatic Sea's multispecies nature. Target species identified in terms of catches and revenue imply a systematic tactic over a long period of time, and incidental catches are equally important in terms of overall group similarity. The identification of target species groups may be useful in assessing the current sampling stratification schemes.
{"title":"Portraying Trawl Fishery in Albanian Waters: Case Study from the Sarandë Area (Southern Albania)","authors":"R. Bakiu, M. Gurma, Dimitrios K. Moutopoulos","doi":"10.2478/cjf-2023-0012","DOIUrl":"https://doi.org/10.2478/cjf-2023-0012","url":null,"abstract":"Abstract The current study provides valuable insight into the trawl fishery operating in southern Albanian waters via an integrated approach based on high-frequency onboard monitoring trawl vessels and on-site interviews with local fishers. Multivariate analyses of the composition of species landings or economic revenue revealed groups that, depending on the group, were distinguished by improved fisheries landings and economic efficiency. The majority of the catch consisted of a variety of demersal and small- and medium-sized pelagic species, confirming the Adriatic Sea's multispecies nature. Target species identified in terms of catches and revenue imply a systematic tactic over a long period of time, and incidental catches are equally important in terms of overall group similarity. The identification of target species groups may be useful in assessing the current sampling stratification schemes.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"81 1","pages":"103 - 114"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43262454","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 Mediterranean Sea is a hotspot for shark and ray extinctions and is home to the following three angelshark species: sawback angelshark Squatina aculeata, smoothback angelshark Squatina oculata, and common angelshark Squatina squatina. We conducted a questionnaire-based survey in four coastal regions of Albania, Shëngjin (Lezhë), Vlorë, Himarë (Sarandë) and Durrës, with the aim of collecting historical and current data on angelshark catches in the Albanian seas (Adriatic and Ionian Seas). Although the occurrence of common angelshark was reported by Croatian fishermen in the Adriatic Sea, we included the other two species in our study. The number of observations was minimal, although this is the first study of angelshark species sightings in Albania. It will establish a baseline study that will allow further work on the conservation of these regionally extinct and highly endangered species.
{"title":"Using Local Ecological Knowledge of Fishers to Identify the Presence and Habitats of Angelsharks in Albanian Waters","authors":"R. Bakiu, Artenisa Peculaj, Patrik Krstinic","doi":"10.2478/cjf-2023-0015","DOIUrl":"https://doi.org/10.2478/cjf-2023-0015","url":null,"abstract":"Abstract The Mediterranean Sea is a hotspot for shark and ray extinctions and is home to the following three angelshark species: sawback angelshark Squatina aculeata, smoothback angelshark Squatina oculata, and common angelshark Squatina squatina. We conducted a questionnaire-based survey in four coastal regions of Albania, Shëngjin (Lezhë), Vlorë, Himarë (Sarandë) and Durrës, with the aim of collecting historical and current data on angelshark catches in the Albanian seas (Adriatic and Ionian Seas). Although the occurrence of common angelshark was reported by Croatian fishermen in the Adriatic Sea, we included the other two species in our study. The number of observations was minimal, although this is the first study of angelshark species sightings in Albania. It will establish a baseline study that will allow further work on the conservation of these regionally extinct and highly endangered species.","PeriodicalId":38161,"journal":{"name":"Ribarstvo, Croatian Journal of Fisheries","volume":"81 1","pages":"139 - 146"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44653701","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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