Dong Wang , Le Hu , Fubin Zhang , Fengqun Zheng , Mengyu Gong , Fei Xiong , Hongyan Liu , Dongdong Zhai
Macrobrachium nipponense is a major farmed species freshwater shrimp in China and its genetic diversity is of high value in aquaculture. The construction of the Three Gorges Project has slowed down the water velocity in the Three Gorges Reservoir (TGR) and made the water more clear, which is more favourable for the survival and reproduction of M. nipponense. However, there are lack of studies on the genetic diversity of M. nipponense populations in the TGR. In this study, mitochondrial COI gene sequences were used as molecular marker to analyze the genetic diversity, genetic differentiation and historical demography of eight M. nipponense populations in the TGR. The results showed that the M. nipponense populations in TGR have high genetic diversity. There was some genetic differentiation between the four populations in lower reaches of the TGR and four populations in the upper reaches of the TGR. We also found that there was a significant correlation between genetic distance and geographical distance among the M. nipponense populations in the TGR. The M. nipponense population in the TGR has experienced population reduction in the recent year, which might be related to the ice age movement in the Little Ice Age and human activities. This study provides a theoretical basis for the rational development and protection of M. nipponense resources in the TGR.
{"title":"Genetic structure of Macrobrachium nipponense, an important farmed freshwater shrimp in China, in the Three Gorges Reservoir","authors":"Dong Wang , Le Hu , Fubin Zhang , Fengqun Zheng , Mengyu Gong , Fei Xiong , Hongyan Liu , Dongdong Zhai","doi":"10.1051/alr/2024003","DOIUrl":"10.1051/alr/2024003","url":null,"abstract":"<div><p><em>Macrobrachium nipponense</em> is a major farmed species freshwater shrimp in China and its genetic diversity is of high value in aquaculture. The construction of the Three Gorges Project has slowed down the water velocity in the Three Gorges Reservoir (TGR) and made the water more clear, which is more favourable for the survival and reproduction of <em>M. nipponense</em>. However, there are lack of studies on the genetic diversity of <em>M. nipponense</em> populations in the TGR. In this study, mitochondrial COI gene sequences were used as molecular marker to analyze the genetic diversity, genetic differentiation and historical demography of eight <em>M. nipponense</em> populations in the TGR. The results showed that the <em>M. nipponense</em> populations in TGR have high genetic diversity. There was some genetic differentiation between the four populations in lower reaches of the TGR and four populations in the upper reaches of the TGR. We also found that there was a significant correlation between genetic distance and geographical distance among the <em>M. nipponense</em> populations in the TGR. The <em>M. nipponense</em> population in the TGR has experienced population reduction in the recent year, which might be related to the ice age movement in the Little Ice Age and human activities. This study provides a theoretical basis for the rational development and protection of <em>M. nipponense</em> resources in the TGR.</p></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"37 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142076196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Lake Chad basin is one of the most politico-ecologically complex regions in Africa. The rapid global climate change caused by decades of unsustainable resource utilization has not only impaired the ecosystem function but has escalated further conflict with the associated terrorism in the region. This paper reviews the notion of environmental peacebuilding through the introduction of trans-boundary conservation as a mechanism to achieve peace and harmony in the Lake Chad region. The proposed trans-boundary conservation area will restore ecosystem services, conserve biodiversity, improve livelihood, and reduce poverty in the Lake Chad basin. The paper provides justification for the establishment of the “Lake Chad trans-boundary Ramsar site” as an example of how a trans-boundary conservation area could act as a catalyst for improved political cooperation using inter-linkage with other Multilateral Environmental Agreements in the region.
{"title":"Fostering international and trans-boundary cooperation in the management of Lake Chad fisheries, wildlife and flora: the role of a trans-boundary Ramsar conservation area","authors":"Prince Emeka Ndimele , Adeniran Akanni , Kehinde Moyosola Ositimehin , Jamiu Adebayo Shittu , Akinloye Emmanuel Ojewole , Yeside Zainab Ayeni","doi":"10.1051/alr/2024004","DOIUrl":"10.1051/alr/2024004","url":null,"abstract":"<div><p>The Lake Chad basin is one of the most politico-ecologically complex regions in Africa. The rapid global climate change caused by decades of unsustainable resource utilization has not only impaired the ecosystem function but has escalated further conflict with the associated terrorism in the region. This paper reviews the notion of environmental peacebuilding through the introduction of trans-boundary conservation as a mechanism to achieve peace and harmony in the Lake Chad region. The proposed trans-boundary conservation area will restore ecosystem services, conserve biodiversity, improve livelihood, and reduce poverty in the Lake Chad basin. The paper provides justification for the establishment of the “Lake Chad trans-boundary Ramsar site” as an example of how a trans-boundary conservation area could act as a catalyst for improved political cooperation using inter-linkage with other Multilateral Environmental Agreements in the region.</p></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"37 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142076195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Enshuo Hsu, Abdulaziz T Bako, Thomas Potter, Alan P Pan, Gavin W Britz, Jonika Tannous, Farhaan S Vahidy
Background: Neuroimaging is the gold-standard diagnostic modality for all patients suspected of stroke. However, the unstructured nature of imaging reports remains a major challenge to extracting useful information from electronic health records systems. Despite the increasing adoption of natural language processing (NLP) for radiology reports, information extraction for many stroke imaging features has not been systematically evaluated.
Objective: In this study, we propose an NLP pipeline, which adopts the state-of-the-art ClinicalBERT model with domain-specific pretraining and task-oriented fine-tuning to extract 13 stroke features from head computed tomography imaging notes.
Methods: We used the model to generate structured data sets with information on the presence or absence of common stroke features for 24,924 patients with strokes. We compared the survival characteristics of patients with and without features of severe stroke (eg, midline shift, perihematomal edema, or mass effect) using the Kaplan-Meier curve and log-rank tests.
Results: Pretrained on 82,073 head computed tomography notes with 13.7 million words and fine-tuned on 200 annotated notes, our HeadCT_BERT model achieved an average area under receiver operating characteristic curve of 0.9831, F1-score of 0.8683, and accuracy of 97%. Among patients with acute ischemic stroke, admissions with any severe stroke feature in initial imaging notes were associated with a lower probability of survival (P<.001).
Conclusions: Our proposed NLP pipeline achieved high performance and has the potential to improve medical research and patient safety.
{"title":"Extraction of Radiological Characteristics From Free-Text Imaging Reports Using Natural Language Processing Among Patients With Ischemic and Hemorrhagic Stroke: Algorithm Development and Validation.","authors":"Enshuo Hsu, Abdulaziz T Bako, Thomas Potter, Alan P Pan, Gavin W Britz, Jonika Tannous, Farhaan S Vahidy","doi":"10.2196/42884","DOIUrl":"10.2196/42884","url":null,"abstract":"<p><strong>Background: </strong>Neuroimaging is the gold-standard diagnostic modality for all patients suspected of stroke. However, the unstructured nature of imaging reports remains a major challenge to extracting useful information from electronic health records systems. Despite the increasing adoption of natural language processing (NLP) for radiology reports, information extraction for many stroke imaging features has not been systematically evaluated.</p><p><strong>Objective: </strong>In this study, we propose an NLP pipeline, which adopts the state-of-the-art ClinicalBERT model with domain-specific pretraining and task-oriented fine-tuning to extract 13 stroke features from head computed tomography imaging notes.</p><p><strong>Methods: </strong>We used the model to generate structured data sets with information on the presence or absence of common stroke features for 24,924 patients with strokes. We compared the survival characteristics of patients with and without features of severe stroke (eg, midline shift, perihematomal edema, or mass effect) using the Kaplan-Meier curve and log-rank tests.</p><p><strong>Results: </strong>Pretrained on 82,073 head computed tomography notes with 13.7 million words and fine-tuned on 200 annotated notes, our HeadCT_BERT model achieved an average area under receiver operating characteristic curve of 0.9831, F<sub>1</sub>-score of 0.8683, and accuracy of 97%. Among patients with acute ischemic stroke, admissions with any severe stroke feature in initial imaging notes were associated with a lower probability of survival (P<.001).</p><p><strong>Conclusions: </strong>Our proposed NLP pipeline achieved high performance and has the potential to improve medical research and patient safety.</p>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"1 1","pages":"e42884"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11041442/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79836241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dr. Olivier Thebaud, Fitih F. Hailu , Worku T. Bitew , Tsegaye G. Ayele , Simon D. Zawka
In this research, we attempt to give a comparative analysis of the space allocation of multiple-use marine protected areas (MPAs) including but not limited to the introduction of aquaculture in the area. Specifically, we consider the case where there is a need to develop MPAs for the conservation of the environment and ecological diversity. There is also a prevailing call for the establishment of aquaculture activities within the area to meet societal demands. Although aquaculture has negative externalities on MPAs, it helps to reduce the pressure on the capture fishery and increases the supply of fish. We develop a deterministic bioeconomic model that describes the transition dynamics and interrelationships of the systems. We find an optimal aquaculture size relative to the optimal size of MPAs that maximizes the overall economic and ecological benefits. Using numerical methods we determine the trajectory of optimal solutions, the recovery rate of the stocks in and outside the MPAs, and the expansion rate of the aquaculture. Sensitivity analysis was also performed to see the effect of a change in the parameters on the optimal solutions. The numerical results show that MPAs are resilient after the implementation of aquaculture. Moreover, the effectiveness of the optimized management system mainly depends on the cooperative planning between the capture fishery and aquaculture managers.
{"title":"Marine protected areas for resilience and economic development","authors":"Dr. Olivier Thebaud, Fitih F. Hailu , Worku T. Bitew , Tsegaye G. Ayele , Simon D. Zawka","doi":"10.1051/alr/2023016","DOIUrl":"10.1051/alr/2023016","url":null,"abstract":"<div><div>In this research, we attempt to give a comparative analysis of the space allocation of multiple-use marine protected areas (MPAs) including but not limited to the introduction of aquaculture in the area. Specifically, we consider the case where there is a need to develop MPAs for the conservation of the environment and ecological diversity. There is also a prevailing call for the establishment of aquaculture activities within the area to meet societal demands. Although aquaculture has negative externalities on MPAs, it helps to reduce the pressure on the capture fishery and increases the supply of fish. We develop a deterministic bioeconomic model that describes the transition dynamics and interrelationships of the systems. We find an optimal aquaculture size relative to the optimal size of MPAs that maximizes the overall economic and ecological benefits. Using numerical methods we determine the trajectory of optimal solutions, the recovery rate of the stocks in and outside the MPAs, and the expansion rate of the aquaculture. Sensitivity analysis was also performed to see the effect of a change in the parameters on the optimal solutions. The numerical results show that MPAs are resilient after the implementation of aquaculture. Moreover, the effectiveness of the optimized management system mainly depends on the cooperative planning between the capture fishery and aquaculture managers.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"36 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Olivier Thebaud, Griffin Carpenter , Natacha Carvalho , Jordi Guillen , Raúl Prellezo , Sebastián Villasante , Jesper L. Andersen , Edo Avdic Mravlje , Jörg Berkenhagen , Cecile Brigaudeau , Brian Burke , Angel Calvo Santos , Suzana Cano , Franca Contini , José-María Da-Rocha , Irina Davidjuka , Francisco Manuel Fernández Martínez , Ignacio Fontaneda-López , Monica Gambino , Elena Garcia Caballero , Kolyo Zhelev
The COVID-19 outbreak and subsequent public health interventions have depressed demand and disrupted supply chains for many fishing businesses. This paper provides an analysis of the COVID-19 impacts on the profitability of the EU fishing fleets. Nowcasting techniques were used to estimate the impact of the COVID-19 pandemic on the economic performance for the EU fishing fleet in 2020 and 2021. Our results show that the economic impact of COVID-19 on this sector was smaller than initially expected and overall profits remained positive. This was in part due to low fuel prices that reduced operating costs of fishing, and the early response from governments to support the sector. The results vary by fishing fleet, revealing that small-scale fleets and the fleets in the Mediterranean and Black seas have been more impacted than large-scale fleets and the fleets in the Northeast Atlantic.
{"title":"The economic performance of the EU fishing fleet during the COVID-19 pandemic","authors":"Olivier Thebaud, Griffin Carpenter , Natacha Carvalho , Jordi Guillen , Raúl Prellezo , Sebastián Villasante , Jesper L. Andersen , Edo Avdic Mravlje , Jörg Berkenhagen , Cecile Brigaudeau , Brian Burke , Angel Calvo Santos , Suzana Cano , Franca Contini , José-María Da-Rocha , Irina Davidjuka , Francisco Manuel Fernández Martínez , Ignacio Fontaneda-López , Monica Gambino , Elena Garcia Caballero , Kolyo Zhelev","doi":"10.1051/alr/2022022","DOIUrl":"10.1051/alr/2022022","url":null,"abstract":"<div><div>The COVID-19 outbreak and subsequent public health interventions have depressed demand and disrupted supply chains for many fishing businesses. This paper provides an analysis of the COVID-19 impacts on the profitability of the EU fishing fleets. Nowcasting techniques were used to estimate the impact of the COVID-19 pandemic on the economic performance for the EU fishing fleet in 2020 and 2021. Our results show that the economic impact of COVID-19 on this sector was smaller than initially expected and overall profits remained positive. This was in part due to low fuel prices that reduced operating costs of fishing, and the early response from governments to support the sector. The results vary by fishing fleet, revealing that small-scale fleets and the fleets in the Mediterranean and Black seas have been more impacted than large-scale fleets and the fleets in the Northeast Atlantic.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"36 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ryan B Carnegie, Philine S.E. zu Ermgassen , Åsa Strand , Nienke Bakker , Ainhoa Blanco , Kruno Bonačić , Pierre Boudry , Gianni Brundu , Tom C. Cameron , Iarfhlaith Connellan , Fiz da Costa , Alison Debney , Monica Fabra , Anamarija Frankic , Celine Gamble , Mathew W. Gray , Luke Helmer , Zoë Holbrook , Tristan Hugh-Jones , Pauline Kamermans , Bérenger Colsoul
The European flat oyster, Ostrea edulis, is a habitat-forming bivalve which was historically widespread throughout Europe. Following its decline due to overfishing, pollution, sedimentation, invasive species, and disease, O. edulis and its beds are now listed as a threatened and/or declining species and habitat by OSPAR. Increasing recognition of the plight of the oyster, alongside rapidly developing restoration techniques and growing interest in marine restoration, has resulted in a recent and rapid growth in habitat restoration efforts. O. edulis seed supply is currently a major bottleneck in scaling up habitat restoration efforts in Europe. O. edulis has been cultured for centuries, however, research into its culture declined following the introduction of the Pacific oyster, Crassostrea gigas to Europe in the early 1970 s. Recent efforts to renew both hatchery and pond production of O. edulis seed for habitat restoration purposes are hampered by restoration project timelines and funding typically being short, or projects not planning appropriately for the timescales required for investment, research-and-development and delivery of oyster seed by commercial producers. Furthermore, funding for restoration is intermittent, making long-term commitments between producers and restoration practitioners difficult. Long-term, strategic investment in research and production are needed to overcome these bottlenecks and meet current ambitious restoration targets across Europe.
{"title":"Overcoming Ostrea edulis seed production limitations to meet ecosystem restoration demands in the UN decade on restoration","authors":"Ryan B Carnegie, Philine S.E. zu Ermgassen , Åsa Strand , Nienke Bakker , Ainhoa Blanco , Kruno Bonačić , Pierre Boudry , Gianni Brundu , Tom C. Cameron , Iarfhlaith Connellan , Fiz da Costa , Alison Debney , Monica Fabra , Anamarija Frankic , Celine Gamble , Mathew W. Gray , Luke Helmer , Zoë Holbrook , Tristan Hugh-Jones , Pauline Kamermans , Bérenger Colsoul","doi":"10.1051/alr/2023012","DOIUrl":"10.1051/alr/2023012","url":null,"abstract":"<div><div>The European flat oyster, <em>Ostrea edulis</em>, is a habitat-forming bivalve which was historically widespread throughout Europe. Following its decline due to overfishing, pollution, sedimentation, invasive species, and disease, <em>O. edulis</em> and its beds are now listed as a threatened and/or declining species and habitat by OSPAR. Increasing recognition of the plight of the oyster, alongside rapidly developing restoration techniques and growing interest in marine restoration, has resulted in a recent and rapid growth in habitat restoration efforts. <em>O. edulis</em> seed supply is currently a major bottleneck in scaling up habitat restoration efforts in Europe. <em>O. edulis</em> has been cultured for centuries, however, research into its culture declined following the introduction of the Pacific oyster, <em>Crassostrea gigas</em> to Europe in the early 1970 s. Recent efforts to renew both hatchery and pond production of <em>O. edulis</em> seed for habitat restoration purposes are hampered by restoration project timelines and funding typically being short, or projects not planning appropriately for the timescales required for investment, research-and-development and delivery of oyster seed by commercial producers. Furthermore, funding for restoration is intermittent, making long-term commitments between producers and restoration practitioners difficult. Long-term, strategic investment in research and production are needed to overcome these bottlenecks and meet current ambitious restoration targets across Europe.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"36 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57825187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pierre Boudry, Stefan Reiser , Timo Michels , Björn Illing
Anadromous European smelt (Osmerus eperlanus) is a keystone species in lake and river ecosystems. In the past and present, stock declines in several of its habitats have been reported. The reasons for this are unclear. Experimental research on the early life stages could help to reveal the potential causes. For this purpose, knowledge on artificial propagation and rearing of early life stages is needed. Following from previous work, we show how to scale up and mass rear European smelt using conventional hatchery equipment and present a simplified protocol for first feeding. Smelt eggs, after egg adhesiveness is removed, can be incubated in standard hatchery equipment commonly used in aquaculture. Incubation in McDonald-type jars shows even improved results when settling of floating eggs is prevented. Next to avoiding egg loss this simultaneously reduces labor for daily care. First feeding of larval smelt can be achieved with decapsulated artemia cysts, eliminating the need for the labor-intensive green water production. Using the protocol presented, larvae of different stages can be produced in large quantities allowing further experimental studies.
{"title":"First steps towards mass rearing of European smelt (Osmerus eperlanus, L.) using conventional hatchery equipment","authors":"Pierre Boudry, Stefan Reiser , Timo Michels , Björn Illing","doi":"10.1051/alr/2023003","DOIUrl":"10.1051/alr/2023003","url":null,"abstract":"<div><div>Anadromous European smelt (<em>Osmerus eperlanus</em>) is a keystone species in lake and river ecosystems. In the past and present, stock declines in several of its habitats have been reported. The reasons for this are unclear. Experimental research on the early life stages could help to reveal the potential causes. For this purpose, knowledge on artificial propagation and rearing of early life stages is needed. Following from previous work, we show how to scale up and mass rear European smelt using conventional hatchery equipment and present a simplified protocol for first feeding. Smelt eggs, after egg adhesiveness is removed, can be incubated in standard hatchery equipment commonly used in aquaculture. Incubation in McDonald-type jars shows even improved results when settling of floating eggs is prevented. Next to avoiding egg loss this simultaneously reduces labor for daily care. First feeding of larval smelt can be achieved with decapsulated artemia cysts, eliminating the need for the labor-intensive green water production. Using the protocol presented, larvae of different stages can be produced in large quantities allowing further experimental studies.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"36 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tom C. Cameron, Verena Merk , Tanja Hausen , Timon Ameis , Bérenger Colsoul , Maarten Boersma , Bernadette Pogoda
Growth is an important biological trait and monitoring metric for the assessment of the success and progress of restoration projects with the European oyster (Ostrea edulis). However, sampling time and frequency are often limited, as well as the ability to survey individual growth. Chemical dyes, such as calcein, can be used to create incremental markings for measuring growth in shell cross-sections, especially in bivalves. However, potential negative effects and limits for successful staining have not been assessed for O. edulis, yet. In this study, three different calcein concentrations (100 mg l−1, 150 mg l−1, 200 mg l−1) with three different immersion times (6 h, 12 h, 24 h) were tested for potential negative effects, the best incremental marking result and their potential to be used in growth measurements. Furthermore, the deposition of an annual growth line was investigated. Results showed that calcein is a reliable in situ fluorescence marker that produced sufficient growth lines in the cross-section of O. edulis. At a concentration of 100 mg l−1 or higher and immersion times of 6 h or more, no negative effects on growth and survival were observed after five months. Applications include the possibility for long-term, individual growth data for a large number of oysters for restoration monitoring as well as the option of marking restored oysters from aquaculture production to distinguish them from existing wild stock populations or natural offspring.
生长是衡量欧洲牡蛎（Ostrea edulis）恢复工程成功与进展的重要生物学性状和监测指标。然而，采样时间和频率往往是有限的，以及调查个人成长的能力。化学染料，如钙黄蛋白，可用于创建增量标记，以测量壳截面的生长，特别是在双壳类中。然而，潜在的负面影响和成功染色的限制尚未评估。在这项研究中，测试了三种不同钙黄蛋白浓度（100 mg l - 1,150 mg l - 1,200 mg l - 1）和三种不同浸泡时间（6小时，12小时，24小时）的潜在负面影响，最佳增量标记结果及其用于生长测量的潜力。此外，还研究了年生长线的沉积。结果表明，钙黄蛋白是一种可靠的原位荧光标记物，在毛竹的横截面上产生了足够的生长线。当浓度为100 mg l - 1或更高时，浸泡时间为6小时或更长，5个月后对生长和存活没有负面影响。应用包括为恢复监测提供大量牡蛎的长期个体生长数据的可能性，以及标记从水产养殖生产中恢复的牡蛎，以将它们与现有的野生种群或自然后代区分开来的选择。
{"title":"Potential of calcein staining as growth monitoring marker in Ostrea edulis","authors":"Tom C. Cameron, Verena Merk , Tanja Hausen , Timon Ameis , Bérenger Colsoul , Maarten Boersma , Bernadette Pogoda","doi":"10.1051/alr/2023010","DOIUrl":"10.1051/alr/2023010","url":null,"abstract":"<div><div>Growth is an important biological trait and monitoring metric for the assessment of the success and progress of restoration projects with the European oyster (<em>Ostrea edulis</em>). However, sampling time and frequency are often limited, as well as the ability to survey individual growth. Chemical dyes, such as calcein, can be used to create incremental markings for measuring growth in shell cross-sections, especially in bivalves. However, potential negative effects and limits for successful staining have not been assessed for <em>O. edulis</em>, yet. In this study, three different calcein concentrations (100 mg l<sup>−1</sup>, 150 mg l<sup>−1</sup>, 200 mg l<sup>−1</sup>) with three different immersion times (6 h, 12 h, 24 h) were tested for potential negative effects, the best incremental marking result and their potential to be used in growth measurements. Furthermore, the deposition of an annual growth line was investigated. Results showed that calcein is a reliable <em>in situ</em> fluorescence marker that produced sufficient growth lines in the cross-section of <em>O. edulis</em>. At a concentration of 100 mg l<sup>−1</sup> or higher and immersion times of 6 h or more, no negative effects on growth and survival were observed after five months. Applications include the possibility for long-term, individual growth data for a large number of oysters for restoration monitoring as well as the option of marking restored oysters from aquaculture production to distinguish them from existing wild stock populations or natural offspring.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"36 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57825158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Costas S Tsigenopoulos, Md. Rabiul Islam , Olumide Samuel Olowe , Shayla Sultana Mely , Md. Amzad Hossain , Mousumi Das , Md. Farid Uz Zaman
Fish seed are important for the growth of aquaculture in Bangladesh, but there are many challenges associated with supplying quality fish seed. This review evaluated the current level of production, issues and challenges that are affecting the production of fish seed in Bangladesh. The fish hatchery was found to be the major contributor in terms of fish seed production. Out of 671 metric tons of fish seed produced in 2020–2021, above 99% were from hatcheries. Freshwater finfish hatcheries have expanded over the last 30 yr, and are distributed throughout the country, but there is no commercial hatchery for coastal and marine water finfish species in the country. Shrimp and prawn hatcheries are concentrated in Cox's Bazar and the greater Jassore regions, respectively, while crab culture is entirely dependent on wild capture. Crablets are collected from nature, which has a devastating impact on biodiversity and wild stocks. The fish seed value chain is multidirectional and interlinked, and intermediaries dominate the supply chain. Disease outbreaks and indiscriminate use of chemicals are major concerns in fish seed production. Management strategies such as the introduction of certification, training programs, technology transfer, access to credit, and implementation of the law could improve the quality and productivity of fish seed in Bangladesh.
{"title":"Review of the current situation, problems, and challenges in fish seed production and supply for Bangladesh's aquaculture development","authors":"Costas S Tsigenopoulos, Md. Rabiul Islam , Olumide Samuel Olowe , Shayla Sultana Mely , Md. Amzad Hossain , Mousumi Das , Md. Farid Uz Zaman","doi":"10.1051/alr/2023028","DOIUrl":"10.1051/alr/2023028","url":null,"abstract":"<div><div>Fish seed are important for the growth of aquaculture in Bangladesh, but there are many challenges associated with supplying quality fish seed. This review evaluated the current level of production, issues and challenges that are affecting the production of fish seed in Bangladesh. The fish hatchery was found to be the major contributor in terms of fish seed production. Out of 671 metric tons of fish seed produced in 2020–2021, above 99% were from hatcheries. Freshwater finfish hatcheries have expanded over the last 30 yr, and are distributed throughout the country, but there is no commercial hatchery for coastal and marine water finfish species in the country. Shrimp and prawn hatcheries are concentrated in Cox's Bazar and the greater Jassore regions, respectively, while crab culture is entirely dependent on wild capture. Crablets are collected from nature, which has a devastating impact on biodiversity and wild stocks. The fish seed value chain is multidirectional and interlinked, and intermediaries dominate the supply chain. Disease outbreaks and indiscriminate use of chemicals are major concerns in fish seed production. Management strategies such as the introduction of certification, training programs, technology transfer, access to credit, and implementation of the law could improve the quality and productivity of fish seed in Bangladesh.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"36 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143354081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AE David Kaplan, Kenn Papadopoulo , David Villegas-Ríos , Gonzalo Mucientes , Alina Hillinger , Alexandre Alonso-Fernández
Fish movements are fundamental to their ecology and survival. Understanding the causes and consequences of the spatial behaviour of fish is of high relevance as it provides critical knowledge for conservation purposes. Skate (Rajidae) populations face an unprecedented global decline due to overfishing. In this study, we used acoustic telemetry to track the movements of nine individuals of the near threatened thornback skate (Raja clavata) around the Cíes Islands, a small marine protected area in the northwest of the Iberian Peninsula. Our results demonstrate the significant impacts of biotic and abiotic drivers on the spatial behaviour of R. clavata. Overall residency inside the study array was low (0.073), differed between sexes (higher for females) and over the course of the year (peaking in summer). The analysis of the direction of the excursions performed by R. clavata individuals revealed high consistency in the exit and entry areas and a strong connectivity with inshore waters connecting with the Ría de Vigo, as compared with offshore waters connecting with the open ocean. Finally, the activity space of R. clavata also varied over the time of the year with a peak in summer. This study provides an important baseline information for understanding the spatial behaviour of R. clavata that can serve as a starting point for planning future conservation actions or studies.
鱼类的活动对它们的生态和生存至关重要。了解鱼类空间行为的原因和后果是高度相关的，因为它为保护目的提供了关键的知识。由于过度捕捞，鳐（Rajidae）的数量面临着前所未有的全球下降。在这项研究中，我们使用声波遥测技术跟踪了Cíes群岛周围9只濒临威胁的刺背鳐（Raja clavata）的活动，这是伊比利亚半岛西北部的一个小型海洋保护区。我们的研究结果表明，生物和非生物驱动因素对克拉瓦塔的空间行为有显著影响。在研究阵列中的总体驻留率很低（0.073），在性别之间（女性较高）和一年中的过程中（夏季达到峰值）存在差异。对克拉瓦塔r.c avata个体迁徙方向的分析显示，与与公海相连的近海水域相比，它们在出口和入境区域具有高度的一致性，与Ría de Vigo相连的近海水域具有很强的连通性。最后，克拉瓦塔的活动空间在一年中的不同时间也有变化，在夏季达到高峰。该研究为了解克拉瓦塔的空间行为提供了重要的基线信息，可作为规划未来保护行动或研究的起点。
{"title":"Drivers of the spatial behaviour of the threatened thornback skate (Raja clavata)","authors":"AE David Kaplan, Kenn Papadopoulo , David Villegas-Ríos , Gonzalo Mucientes , Alina Hillinger , Alexandre Alonso-Fernández","doi":"10.1051/alr/2023017","DOIUrl":"10.1051/alr/2023017","url":null,"abstract":"<div><div>Fish movements are fundamental to their ecology and survival. Understanding the causes and consequences of the spatial behaviour of fish is of high relevance as it provides critical knowledge for conservation purposes. Skate (Rajidae) populations face an unprecedented global decline due to overfishing. In this study, we used acoustic telemetry to track the movements of nine individuals of the near threatened thornback skate (<em>Raja clavata</em>) around the Cíes Islands, a small marine protected area in the northwest of the Iberian Peninsula. Our results demonstrate the significant impacts of biotic and abiotic drivers on the spatial behaviour of <em>R. clavata</em>. Overall residency inside the study array was low (0.073), differed between sexes (higher for females) and over the course of the year (peaking in summer). The analysis of the direction of the excursions performed by <em>R. clavata</em> individuals revealed high consistency in the exit and entry areas and a strong connectivity with inshore waters connecting with the Ría de Vigo, as compared with offshore waters connecting with the open ocean. Finally, the activity space of <em>R. clavata</em> also varied over the time of the year with a peak in summer. This study provides an important baseline information for understanding the spatial behaviour of <em>R. clavata</em> that can serve as a starting point for planning future conservation actions or studies.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"36 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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