Abigail S Golden, Marissa L Baskett, Dan Holland, Arielle Levine, Kathy Mills, Timothy Essington
Fisheries face unprecedented environmental change. An important aspect of resilience to this change is the adaptive capacity of managers and stakeholders to respond to new conditions. A growing academic literature has demonstrated the value of fostering this adaptive capacity and highlighted key elements of fisheries social-ecological systems that can promote it. However, it is unclear to what extent these abstract academic ideas around adaptive capacity are relevant and valuable to on-the-ground resource managers, and if so, whether there are aspects of the literature that particularly resonate with their needs. Here, we compare academic concepts of adaptive capacity to the ways that management practitioners conceptualize and implement these ideas in practice, elicited through interviews with key professionals in United States federal fishery management bodies. Practitioners overwhelmingly cited flexibility to respond to change as the most consistently important element of adaptive capacity. Yet, they also detailed how the U.S. fishery management system routinely limits and constrains the flexibility of managers and stakeholders. Seeking out opportunities that enhance flexibility without jeopardizing other key aspects of adaptive capacity could increase management’s adaptive capacity to global change in the USA and elsewhere.
{"title":"Climate adaptation depends on rebalancing flexibility and rigidity in US fisheries management","authors":"Abigail S Golden, Marissa L Baskett, Dan Holland, Arielle Levine, Kathy Mills, Timothy Essington","doi":"10.1093/icesjms/fsad189","DOIUrl":"https://doi.org/10.1093/icesjms/fsad189","url":null,"abstract":"Fisheries face unprecedented environmental change. An important aspect of resilience to this change is the adaptive capacity of managers and stakeholders to respond to new conditions. A growing academic literature has demonstrated the value of fostering this adaptive capacity and highlighted key elements of fisheries social-ecological systems that can promote it. However, it is unclear to what extent these abstract academic ideas around adaptive capacity are relevant and valuable to on-the-ground resource managers, and if so, whether there are aspects of the literature that particularly resonate with their needs. Here, we compare academic concepts of adaptive capacity to the ways that management practitioners conceptualize and implement these ideas in practice, elicited through interviews with key professionals in United States federal fishery management bodies. Practitioners overwhelmingly cited flexibility to respond to change as the most consistently important element of adaptive capacity. Yet, they also detailed how the U.S. fishery management system routinely limits and constrains the flexibility of managers and stakeholders. Seeking out opportunities that enhance flexibility without jeopardizing other key aspects of adaptive capacity could increase management’s adaptive capacity to global change in the USA and elsewhere.","PeriodicalId":51072,"journal":{"name":"ICES Journal of Marine Science","volume":"14 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138553821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Muriel Dunn, Chelsey McGowan-Yallop, Geir Pedersen, Stig Falk-Petersen, Malin Daase, Kim Last, Tom J Langbehn, Sophie Fielding, Andrew S Brierley, Finlo Cottier, Sünnje L Basedow, Lionel Camus, Maxime Geoffroy
Classification of zooplankton to species with broadband echosounder data could increase the taxonomic resolution of acoustic surveys and reduce the dependence on net and trawl samples for ‘ground truthing’. Supervised classification with broadband echosounder data is limited by the acquisition of validated data required to train machine learning algorithms (‘classifiers’). We tested the hypothesis that acoustic scattering models could be used to train classifiers for remote classification of zooplankton. Three classifiers were trained with data from scattering models of four Arctic zooplankton groups (copepods, euphausiids, chaetognaths, and hydrozoans). We evaluated classifier predictions against observations of a mixed zooplankton community in a submerged purpose-built mesocosm (12 m3) insonified with broadband transmissions (185–255 kHz). The mesocosm was deployed from a wharf in Ny-Ålesund, Svalbard, during the Arctic polar night in January 2022. We detected 7722 tracked single targets, which were used to evaluate the classifier predictions of measured zooplankton targets. The classifiers could differentiate copepods from the other groups reasonably well, but they could not differentiate euphausiids, chaetognaths, and hydrozoans reliably due to the similarities in their modelled target spectra. We recommend that model-informed classification of zooplankton from broadband acoustic signals be used with caution until a better understanding of in situ target spectra variability is gained.
{"title":"Model-informed classification of broadband acoustic backscatter from zooplankton in an in situ mesocosm","authors":"Muriel Dunn, Chelsey McGowan-Yallop, Geir Pedersen, Stig Falk-Petersen, Malin Daase, Kim Last, Tom J Langbehn, Sophie Fielding, Andrew S Brierley, Finlo Cottier, Sünnje L Basedow, Lionel Camus, Maxime Geoffroy","doi":"10.1093/icesjms/fsad192","DOIUrl":"https://doi.org/10.1093/icesjms/fsad192","url":null,"abstract":"Classification of zooplankton to species with broadband echosounder data could increase the taxonomic resolution of acoustic surveys and reduce the dependence on net and trawl samples for ‘ground truthing’. Supervised classification with broadband echosounder data is limited by the acquisition of validated data required to train machine learning algorithms (‘classifiers’). We tested the hypothesis that acoustic scattering models could be used to train classifiers for remote classification of zooplankton. Three classifiers were trained with data from scattering models of four Arctic zooplankton groups (copepods, euphausiids, chaetognaths, and hydrozoans). We evaluated classifier predictions against observations of a mixed zooplankton community in a submerged purpose-built mesocosm (12 m3) insonified with broadband transmissions (185–255 kHz). The mesocosm was deployed from a wharf in Ny-Ålesund, Svalbard, during the Arctic polar night in January 2022. We detected 7722 tracked single targets, which were used to evaluate the classifier predictions of measured zooplankton targets. The classifiers could differentiate copepods from the other groups reasonably well, but they could not differentiate euphausiids, chaetognaths, and hydrozoans reliably due to the similarities in their modelled target spectra. We recommend that model-informed classification of zooplankton from broadband acoustic signals be used with caution until a better understanding of in situ target spectra variability is gained.","PeriodicalId":51072,"journal":{"name":"ICES Journal of Marine Science","volume":"276 2 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138553620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Correction to: Stable isotopes in eye lenses reveal migration and mixing patterns of diamond squid in the western North Pacific and its marginal seas","authors":"","doi":"10.1093/icesjms/fsad200","DOIUrl":"https://doi.org/10.1093/icesjms/fsad200","url":null,"abstract":"","PeriodicalId":51072,"journal":{"name":"ICES Journal of Marine Science","volume":"18 2","pages":""},"PeriodicalIF":3.3,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138590182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Juan Carlos Farias Pardo, Magnus Aune, Christopher Harman, Mats Walday, Solrun Figenschau Skjellum
Offshore wind is one of the major fast-growing renewable energy industries, and sustainable implementation of offshore wind farms (OWF) is desired. Nature positive approaches have been proposed to promote biodiversity gain and improve ecosystem resilience. At the same time, coexistence has been considered a way to mitigate the race for ocean space and better integrate the development of the OWF industry. Here, we provide a systematic narrative synthesis review on nature positive approaches and coexistence in OWFs. We observed an increased interest in the topics over the last 5 years, with most of the documents coming from the northern hemisphere, in particular Europe and the North Sea. Literature is mostly related to bottom-fixed turbines, with relatively fewer documents available regarding floating offshore wind, which is a nascent industry. There is a lack of long-term in situ assessments of the impact of nature positive approaches. Whilst there are various biodiversity impacts of OWFs, the literature highlights the artificial reef effect and biodiversity protection and gain (diversity and abundance) for ecological and economically relevant groups. Coexistence strategies with OWF, such as fisheries, aquaculture, and marine-protected areas, bring positive and negative outcomes for the environment, and further investigation on their integration should be explored.
{"title":"A synthesis review of nature positive approaches and coexistence in the offshore wind industry","authors":"Juan Carlos Farias Pardo, Magnus Aune, Christopher Harman, Mats Walday, Solrun Figenschau Skjellum","doi":"10.1093/icesjms/fsad191","DOIUrl":"https://doi.org/10.1093/icesjms/fsad191","url":null,"abstract":"Offshore wind is one of the major fast-growing renewable energy industries, and sustainable implementation of offshore wind farms (OWF) is desired. Nature positive approaches have been proposed to promote biodiversity gain and improve ecosystem resilience. At the same time, coexistence has been considered a way to mitigate the race for ocean space and better integrate the development of the OWF industry. Here, we provide a systematic narrative synthesis review on nature positive approaches and coexistence in OWFs. We observed an increased interest in the topics over the last 5 years, with most of the documents coming from the northern hemisphere, in particular Europe and the North Sea. Literature is mostly related to bottom-fixed turbines, with relatively fewer documents available regarding floating offshore wind, which is a nascent industry. There is a lack of long-term in situ assessments of the impact of nature positive approaches. Whilst there are various biodiversity impacts of OWFs, the literature highlights the artificial reef effect and biodiversity protection and gain (diversity and abundance) for ecological and economically relevant groups. Coexistence strategies with OWF, such as fisheries, aquaculture, and marine-protected areas, bring positive and negative outcomes for the environment, and further investigation on their integration should be explored.","PeriodicalId":51072,"journal":{"name":"ICES Journal of Marine Science","volume":" 3","pages":""},"PeriodicalIF":3.3,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138492859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Detecting changes in the distribution and abundance of marine species that are cryptic or occurring in very low abundances is difficult, but essential for assessing their status and informing management. One way of quantifying these changes is through the collation of opportunistic records. We reconstruct the population trajectory and distribution of the common stingray Dasyatis pastinaca around Great Britain, using opportunistic records, mostly obtained by recreational anglers. We tested if D. pastinaca declined in abundance and body size in response to fishing and if their distribution has shifted northwards in response to warming seas. We obtained 518 records covering the period 1838–2020. After correcting for observation effort, D. pastinaca catches reported by anglers showed no long-term trend over 50 years, but decreased from 1970 to 1995 and an increase in abundance since 1995. While records of species occurrence were found around much of Great Britain, nearly all were from south of 54° latitude, and records have contracted southwards since 2000. No trend in maximum size through time was detected. In conclusion, we did not find support for the hypothesized declines in abundance and body size or a northward shift in distribution of D. pastinaca and instead found a southward contraction.
{"title":"Using opportunistic data to study the distribution and abundance of a warm water elasmobranch at the northern edge of its range","authors":"Jan Geert Hiddink, Ryan Charles, Alec B M Moore","doi":"10.1093/icesjms/fsad183","DOIUrl":"https://doi.org/10.1093/icesjms/fsad183","url":null,"abstract":"Detecting changes in the distribution and abundance of marine species that are cryptic or occurring in very low abundances is difficult, but essential for assessing their status and informing management. One way of quantifying these changes is through the collation of opportunistic records. We reconstruct the population trajectory and distribution of the common stingray Dasyatis pastinaca around Great Britain, using opportunistic records, mostly obtained by recreational anglers. We tested if D. pastinaca declined in abundance and body size in response to fishing and if their distribution has shifted northwards in response to warming seas. We obtained 518 records covering the period 1838–2020. After correcting for observation effort, D. pastinaca catches reported by anglers showed no long-term trend over 50 years, but decreased from 1970 to 1995 and an increase in abundance since 1995. While records of species occurrence were found around much of Great Britain, nearly all were from south of 54° latitude, and records have contracted southwards since 2000. No trend in maximum size through time was detected. In conclusion, we did not find support for the hypothesized declines in abundance and body size or a northward shift in distribution of D. pastinaca and instead found a southward contraction.","PeriodicalId":51072,"journal":{"name":"ICES Journal of Marine Science","volume":" 2","pages":""},"PeriodicalIF":3.3,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138492860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elizabeth A Fulton, Nastaran Mazloumi, Aaron Puckeridge, Roshan Hanamseth
South eastern Australia is a global warming hotspot, and is also home to ~70% of Australia’s population and one of Australia’s largest fisheries—the South East Scalefish and Shark Fishery. This fishery spans shelf to deep waters, subtropical to temperate waters, employs many gears, and interacts with over 100 species. Despite following best practice fisheries management principles, including taking an ecosystem perspective to overall fisheries interactions, management interventions have failed to arrest or recover the decline of some focal species. Using an Atlantis ecosystem model developed for the fishery over the past 20 years, this paper presents simulations that suggest climate change may be a major contributor to the trajectories seen for a number of species—such as jackass morwong (Nemadactylus macropterus), blue warehou (Seriolella brama), and gemfish (Rexea solandri). This kind of climate influence poses many challenges for fisheries management into the future, raising questions about what to do when climate change undermines or overrides fisheries management actions and objectives.
澳大利亚东南部是全球变暖的热点地区，也是澳大利亚约70%人口的家园，也是澳大利亚最大的渔场之一——东南鳞鱼和鲨鱼渔场。这个渔场横跨大陆架到深海，亚热带到温带水域，使用许多齿轮，与100多个物种相互作用。尽管遵循了最佳实践渔业管理原则，包括从生态系统角度看待整体渔业相互作用，但管理干预措施未能阻止或恢复一些焦点物种的衰退。利用过去20年来为渔业开发的亚特兰蒂斯生态系统模型，本文进行了模拟，表明气候变化可能是许多物种(如jackass morwong (Nemadactylus macropterus)， blue warehou (Seriolella brama)和gemfish (Rexea solandri))轨迹的主要因素。这种气候影响给未来的渔业管理带来了许多挑战，提出了当气候变化破坏或压倒渔业管理行动和目标时该怎么办的问题。
{"title":"Modelling perspective on the climate footprint in south east Australian marine waters and its fisheries","authors":"Elizabeth A Fulton, Nastaran Mazloumi, Aaron Puckeridge, Roshan Hanamseth","doi":"10.1093/icesjms/fsad185","DOIUrl":"https://doi.org/10.1093/icesjms/fsad185","url":null,"abstract":"South eastern Australia is a global warming hotspot, and is also home to ~70% of Australia’s population and one of Australia’s largest fisheries—the South East Scalefish and Shark Fishery. This fishery spans shelf to deep waters, subtropical to temperate waters, employs many gears, and interacts with over 100 species. Despite following best practice fisheries management principles, including taking an ecosystem perspective to overall fisheries interactions, management interventions have failed to arrest or recover the decline of some focal species. Using an Atlantis ecosystem model developed for the fishery over the past 20 years, this paper presents simulations that suggest climate change may be a major contributor to the trajectories seen for a number of species—such as jackass morwong (Nemadactylus macropterus), blue warehou (Seriolella brama), and gemfish (Rexea solandri). This kind of climate influence poses many challenges for fisheries management into the future, raising questions about what to do when climate change undermines or overrides fisheries management actions and objectives.","PeriodicalId":51072,"journal":{"name":"ICES Journal of Marine Science","volume":" 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138492858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01Epub Date: 2023-07-17DOI: 10.1007/s12070-023-04091-8
Kanu Lal Saha
A solitary fibrous tumour (SFT)/haemangiopericytoma (HPC) accounts for approximately 1% of all vascular tumours, and 13-25% of them are present in the head and neck region. Here, a case of SFT in the left EAC has been reported with the longest duration follow-up among the previously reported cases.
{"title":"Surgical Treatment of the Solitary Fibrous Tumour/ Haemangiopericytoma of the External Auditory Canal: A Case Report.","authors":"Kanu Lal Saha","doi":"10.1007/s12070-023-04091-8","DOIUrl":"10.1007/s12070-023-04091-8","url":null,"abstract":"<p><p>A solitary fibrous tumour (SFT)/haemangiopericytoma (HPC) accounts for approximately 1% of all vascular tumours, and 13-25% of them are present in the head and neck region. Here, a case of SFT in the left EAC has been reported with the longest duration follow-up among the previously reported cases.</p>","PeriodicalId":51072,"journal":{"name":"ICES Journal of Marine Science","volume":"63 1","pages":"4098-4100"},"PeriodicalIF":3.1,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10645716/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76852760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 T Munnelly, Jose C Castillo, Nils Olav Handegard, Matthew E Kimball, Kevin M Boswell, Guillaume Rieucau
For many aquatic animals, distributional patterns, trophodynamic relationships, and reproductive activity are driven by complex biotic and abiotic ecosystem interactions that influence behaviour. Linking behavioural information to environmental stimuli and stressors can, therefore, help to anticipate population and ecosystem responses to changing conditions and inform management. However, behavioural information is challenging to obtain because many sampling gears do not provide adequate spatial or temporal resolution, or potentially alter behaviours. Traditionally, most behavioural studies have been laboratory experiments, while behaviour in situ has often been inferred indirectly. Advancements in imaging sonar technology enable the study of in situ behaviours with the potential to address many understudied relationships. In this review we discuss applications of imaging sonar among a meta-analysis of 155 studies of aquatic organisms in their environments. We evaluate the performance of imaging sonar for studying inter- and intra-specific interactions, associations with complex and sensitive habitats and low-visibility environments, and to evaluate traditional fisheries sampling gears. We examine the data processing and analytical methods used to refine taxonomic resolution, manage time use and autocorrelation through sub-sampling, extract behavioural metrics applied to ecological processes, and for automating abundance estimates and image classification with the goal of providing a resource for researchers.
{"title":"Applications and analytical approaches using imaging sonar for quantifying behavioural interactions among aquatic organisms and their environment","authors":"Ryan T Munnelly, Jose C Castillo, Nils Olav Handegard, Matthew E Kimball, Kevin M Boswell, Guillaume Rieucau","doi":"10.1093/icesjms/fsad182","DOIUrl":"https://doi.org/10.1093/icesjms/fsad182","url":null,"abstract":"For many aquatic animals, distributional patterns, trophodynamic relationships, and reproductive activity are driven by complex biotic and abiotic ecosystem interactions that influence behaviour. Linking behavioural information to environmental stimuli and stressors can, therefore, help to anticipate population and ecosystem responses to changing conditions and inform management. However, behavioural information is challenging to obtain because many sampling gears do not provide adequate spatial or temporal resolution, or potentially alter behaviours. Traditionally, most behavioural studies have been laboratory experiments, while behaviour in situ has often been inferred indirectly. Advancements in imaging sonar technology enable the study of in situ behaviours with the potential to address many understudied relationships. In this review we discuss applications of imaging sonar among a meta-analysis of 155 studies of aquatic organisms in their environments. We evaluate the performance of imaging sonar for studying inter- and intra-specific interactions, associations with complex and sensitive habitats and low-visibility environments, and to evaluate traditional fisheries sampling gears. We examine the data processing and analytical methods used to refine taxonomic resolution, manage time use and autocorrelation through sub-sampling, extract behavioural metrics applied to ecological processes, and for automating abundance estimates and image classification with the goal of providing a resource for researchers.","PeriodicalId":51072,"journal":{"name":"ICES Journal of Marine Science","volume":"42 6","pages":""},"PeriodicalIF":3.3,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138495590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nina Strand, Kevin A Glover, Sonnich Meier, Fernando Ayllon, Vidar Wennevik, Abdullah Madhun, Øystein Skaala, Kristin Hamre, Per Gunnar Fjelldal, Tom Hansen, Eero Niemelä, Sofie Knutar, Per Tommy Fjeldheim, Monica F Solberg
Each year thousands of farmed Atlantic salmon escape from seawater net pens, and introgression has been documented in a range of wild populations. Due to greater experience in the wild, escapees that have been on the run for a longer period, and successfully transitioned to a wild diet (classified: “early escapees”), could potentially have a higher spawning success and contribute more to introgression than those that have been on the run for a shorter period and/or have not transitioned to a wild diet (classified: “recent escapees”). This is the first study to examine how the escape history of farmed Atlantic salmon captured in multiple rivers and coastal fisheries, varies in time and space. During 2011–2021, adult farmed escaped salmon were captured in four rivers and at six coastal sites in Norway. The level of linoleic acid, a terrestrial fatty acid high in commercial salmon feeds but low in the natural diet of wild salmon, was used to classify the farmed salmon as early or recent escapees. We observed temporal declines in the relative proportions of escaped vs. wild salmon in the catches, and the relative proportion of early vs. recent escapees in the most southern river (driven by samples from 2011 to 2015). Overall, 14% of the escaped salmon caught in the period were classified as early escapees. The relative proportion of early escapees was lower in the two southernmost rivers (21.2% and 6.30%), as compared to the coastal fisheries (40.9%) and the northernmost river (77.6%). Both aquaculture–management regulations and production strategies have likely influenced these observations.
{"title":"Regional and temporal variation in escape history of Norwegian farmed Atlantic salmon","authors":"Nina Strand, Kevin A Glover, Sonnich Meier, Fernando Ayllon, Vidar Wennevik, Abdullah Madhun, Øystein Skaala, Kristin Hamre, Per Gunnar Fjelldal, Tom Hansen, Eero Niemelä, Sofie Knutar, Per Tommy Fjeldheim, Monica F Solberg","doi":"10.1093/icesjms/fsad184","DOIUrl":"https://doi.org/10.1093/icesjms/fsad184","url":null,"abstract":"Each year thousands of farmed Atlantic salmon escape from seawater net pens, and introgression has been documented in a range of wild populations. Due to greater experience in the wild, escapees that have been on the run for a longer period, and successfully transitioned to a wild diet (classified: “early escapees”), could potentially have a higher spawning success and contribute more to introgression than those that have been on the run for a shorter period and/or have not transitioned to a wild diet (classified: “recent escapees”). This is the first study to examine how the escape history of farmed Atlantic salmon captured in multiple rivers and coastal fisheries, varies in time and space. During 2011–2021, adult farmed escaped salmon were captured in four rivers and at six coastal sites in Norway. The level of linoleic acid, a terrestrial fatty acid high in commercial salmon feeds but low in the natural diet of wild salmon, was used to classify the farmed salmon as early or recent escapees. We observed temporal declines in the relative proportions of escaped vs. wild salmon in the catches, and the relative proportion of early vs. recent escapees in the most southern river (driven by samples from 2011 to 2015). Overall, 14% of the escaped salmon caught in the period were classified as early escapees. The relative proportion of early escapees was lower in the two southernmost rivers (21.2% and 6.30%), as compared to the coastal fisheries (40.9%) and the northernmost river (77.6%). Both aquaculture–management regulations and production strategies have likely influenced these observations.","PeriodicalId":51072,"journal":{"name":"ICES Journal of Marine Science","volume":"43 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138495589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S C Votier, R B Sherley, K L Scales, K Camphuysen, R A Phillips
Knowledge of fisheries impacts, past and present, is essential for understanding the ecology and conservation of seabirds, but in a rapidly changing world, knowledge and research directions require updating. In this Introduction and in the articles in this Themed Set “Impacts of fishing on seabirds”, we update our understanding of how fishing impacts seabird communities and identify areas for future research. Despite awareness of the problems and mitigation efforts for >20 years, fisheries still negatively impact seabirds via the effects of bycatch, competition, and discards. Bycatch continues to kill hundreds of thousands of seabirds annually, with negative population-level consequences. Fisheries for forage fish (e.g. anchovy, sandeel, and krill) negatively impact seabirds by competing for the same stocks. Historically, discards supplemented seabird diets, benefitting some species but also increasing bycatch rates and altering seabird community composition. However, declining discard production has led to potentially deleterious diet switches, but reduced bycatch rates. To improve research into these problems, we make the following recommendations: (1) improve data collection on seabird–vessel interaction and bycatch rates, on fishing effort and vessel movements (especially small-scale fleets), and on mitigation compliance, (2) counter the current bias towards temperate and high-latitude ecosystems, larger-bodied species and particular life stages or times of year (e.g. adults during breeding), and (3) advance our currently poor understanding of combined effects of fisheries and other threats (e.g. climate change, offshore renewables). In addition, research is required on under-studied aspects of fishing impacts: consequences for depleted sub-surface predators, impacts of illegal, unreported and unregulated fishing, artisanal and emerging fisheries, such as those targeting mesopelagic fish, have received insufficient research attention. Some of these shortfalls can be overcome with new tools (e.g. electronic monitoring, remote sensing, artificial intelligence, and big data) but quantifying and addressing fishing impacts on seabirds requires greater research investment at appropriate spatio-temporal scales, and more inclusive dialogue from grassroots to national and international levels to improve governance as fishing industries continue to evolve.
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