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Kazushi Miyashita - One of the best experts on this subject based on the ideXlab platform.
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Spatial and temporal variation in the distribution of juvenile southern bluefin tuna Thunnus maccoyii: implication for precise estimation of recruitment abundance indices
Fisheries Science, 2010Co-Authors: Ko Fujioka, Ryo Kawabe, Yoshimi Takao, Alistair J. Hobday, Kazushi Miyashita, Osamu Sakai, Tomoyuki ItohAbstract:Acoustic tags were used to examine the spatial and temporal distribution of southern bluefin tuna (SBT) in southern Western Australia, which is in a region where fishery-independent Acoustic Surveys of the recruitment abundance index of SBT have been historically undertaken. We investigated patterns of SBT distribution within and inshore of the Acoustic Survey area during three summer seasons. Annual differences in distribution patterns were characterized by two distinctive migration pathways. An inshore-migrating pathway was observed in two seasons (2004/2005 and 2006/2007), with a relatively high proportion of tagged SBT (84.5, 65.0%) migrating inshore of the Acoustic Survey area. The other pathway was concentrated along the shelf (2005/2006 season), with an estimated 63.3% of tagged SBT moving within the Survey area. These variable migration patterns may bias the interannual fluctuations in abundance indices. Current Survey methods can be modified to include both inshore and continental shelf areas. This contribution shows that the accuracy of Acoustic Surveys can be improved by including ecological patterns.
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correction factors derived from Acoustic tag data for a juvenile southern bluefin tuna abundance index in southernwestern australia
2009Co-Authors: Ryo Kawabe, Yoshimi Takao, Alistair J. Hobday, Kazushi Miyashita, Tomoyuki ItohAbstract:Juvenile southern bluefin tuna (SBT, Thunnus maccoyii), migrate down the coast of Western Australia reaching the southern coast at age-1. In these waters an Acoustic Survey for SBT schools was initiated to generate a fisheries-independent abundance index. A decline in this abundance index led to an Acoustic tagging and monitoring project to determine if a change in migration route or timing could explain the decline. Five years of Acoustic monitoring revealed interannual differences in key factors that could impact the abundance index. Acoustic tag data were used to demonstrate that (i) a high proportion of fish (~70%) may be too shallow for detection in the Acoustic Survey, and that interannual variation in (ii) inshore-offshore fraction (~30–70% each year) and (iii) residence time (12–37 days) will impact calculation of an index. These factors should be included in estimating an abundance index for SBT, together with a correction for (iv) the fraction of juvenile SBT that migrate to southern Western Australia. Collectively, these results illustrate how electronic tagging data can be used to improve understanding of abundance patterns necessary for sustainable management of this exploited species.
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Acoustic identification of isada krill euphausia pacifica hansen off the sanriku coast north eastern japan
Fisheries Oceanography, 1998Co-Authors: Kazushi Miyashita, Kenji Taki, Ichiro Aoki, Koutaro Seno, Takashi OgishimaAbstract:In this study, the feasibility of identification and abundance estimation of isada krill, Euphausia pacifica, was examined using a two-frequency (38 and 120 kHz) method. The Acoustic Survey and midwater trawling were conducted off the Sanriku coast, northern part of Honshu, Japan. In one pattern, the SV difference between the two frequencies was large, and in the other, the SV difference was small. These results were interpreted by scattering models, and showed that discrimination between isada krill and walleye pollock was possible.
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Acoustic identification of isada krill, Euphausia pacifica Hansen, off the Sanriku coast, north‐eastern Japan
Fisheries Oceanography, 1998Co-Authors: Kazushi Miyashita, Kenji Taki, Ichiro Aoki, Koutaro Seno, Takashi OgishimaAbstract:In this study, the feasibility of identification and abundance estimation of isada krill, Euphausia pacifica, was examined using a two-frequency (38 and 120 kHz) method. The Acoustic Survey and midwater trawling were conducted off the Sanriku coast, northern part of Honshu, Japan. In one pattern, the SV difference between the two frequencies was large, and in the other, the SV difference was small. These results were interpreted by scattering models, and showed that discrimination between isada krill and walleye pollock was possible.
P.w. Froneman - One of the best experts on this subject based on the ideXlab platform.
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Macroplankton/micronekton dynamics in the vicinity of the Prince Edward Islands (Southern Ocean)
Marine Biology, 1999Co-Authors: Evgeny A. Pakhomov, P.w. FronemanAbstract:Combined trawling (rectangular midwater trawl, RMT-8 net) and Acoustic (120 kHz) Surveys in the upstream and downstream region of the Prince Edward Islands were undertaken during April and May 1996 and 1997. A total of 49 species of macroplankton and micronekton were encountered within the region investigated. Mesopelagic fishes, euphausiids, chaetognaths and tunicates dominated numerically and by biomass. Average abundance and biomass of macroplankton/micronekton in the top 300 m layer were low, 18 individuals 1000 m−3 and 288 mg dry wt 1000 m−3, respectively. Numerical analysis revealed the presence of two major groups of stations broadly corresponding to the offshore (upstream and downstream) and inshore (inter-island) realms. Planktonic samples and Acoustic measurements revealed that elevated densities of macroplankton/micronekton were associated with the subantarctic front region and in close proximity to the island plateau. Based on trawling and Acoustic Survey results, it is suggested that large plankton and micronekton are mostly washed around rather than across the inter-island shelf region. This is in contrast with the “replenishing hypothesis” previously proposed for this region by other investigators.
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macroplankton micronekton dynamics in the vicinity of the prince edward islands southern ocean
Marine Biology, 1999Co-Authors: Evgeny A. Pakhomov, P.w. FronemanAbstract:Combined trawling (rectangular midwater trawl, RMT-8 net) and Acoustic (120 kHz) Surveys in the upstream and downstream region of the Prince Edward Islands were undertaken during April and May 1996 and 1997. A total of 49 species of macroplankton and micronekton were encountered within the region investigated. Mesopelagic fishes, euphausiids, chaetognaths and tunicates dominated numerically and by biomass. Average abundance and biomass of macroplankton/micronekton in the top 300 m layer were low, 18 individuals 1000 m−3 and 288 mg dry wt 1000 m−3, respectively. Numerical analysis revealed the presence of two major groups of stations broadly corresponding to the offshore (upstream and downstream) and inshore (inter-island) realms. Planktonic samples and Acoustic measurements revealed that elevated densities of macroplankton/micronekton were associated with the subantarctic front region and in close proximity to the island plateau. Based on trawling and Acoustic Survey results, it is suggested that large plankton and micronekton are mostly washed around rather than across the inter-island shelf region. This is in contrast with the “replenishing hypothesis” previously proposed for this region by other investigators.
Keogh N. - One of the best experts on this subject based on the ideXlab platform.
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Blue Whiting Acoustic Survey cruise report, March 20- April 06, 2018
O'Donnell D. Johnston G. Mullins E. Keogh N. and Power J. (2018). Blue Whiting Acoustic Survey cruise report March 20- April 06 2018. FSS Survey Serie, 2018Co-Authors: O'donnell D., Johnston G., Keogh N., Mullins E., Power J.Abstract:Acoustic Surveys targeting blue whiting (Micromesistius poutassou) spawning and post spawning aggregations in the north east Atlantic have been carried out by the Institute of Marine Research (IMR) Norway since the early 1970s. The 2018 Survey was part of an international collaborative Survey using the vessels RV Celtic Explorer (Ireland), RV Tridens (Netherlands), FV Kings Bay (Norway) and the RV Magnus Heinason (Faroes). The total combined area coverage extended from the Faroe Islands in the north (62° N) to south of Ireland (51° N), with east -west extension from 1°-18° W. To the south of 51°N the Spanish research vessel the RV Miguel Oliver conducted a Survey, complimentary to, but separate to the IBWSS Survey, as part of their annual PELACUS Survey program. International Survey participants met shortly after the Survey to present data and produce a combined relative abundance stock estimate and report. The combined Survey report is presented annually at the WGIPS meeting held in January. The information presented here relates specifically to the Irish Survey unless otherwise stated
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Blue Whiting Acoustic Survey cruise report, March 19- April 11, 2017
Marine Institute, 2017Co-Authors: O'donnell D., Johnston G., Keogh N., Mullins E., O'callaghan S.Abstract:Acoustic Surveys on blue whiting (Micromesistius poutassou) spawning aggregations in the north east Atlantic have been carried out by the Institute of Marine Research (IMR) Norway since the early 1970s. The 2017 Survey was part of an international collaborative Survey using the vessels RV Celtic Explorer (Ireland), RV Tridens (Netherlands), FV Kings Bay (Norway) and the RV Magnus Heinason (Faroes). The total combined area coverage extended from the Faroe Islands in the north (62° N) to south of Ireland (51° N), with east -west extension from 1°-17° W. International Survey participants meet shortly after the Survey to present data and produce a combined relative abundance stock estimate and report. The combined Survey report is presented annually at the WGIPS meeting held in January. The information presented here relates specifically to the Irish Survey
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Blue Whiting Acoustic Survey Cruise Report, March 22 - April 01, 2015
Marine Institute, 2015Co-Authors: O'donnell C., Nolan C., Johnston G., Keogh N., Van Der Knaap, Borawska A., O’donovan M.Abstract:Acoustic Surveys on blue whiting (Micromesistius poutassou) spawning aggregations in the north east Atlantic have been carried out by the Institute of Marine Research (IMR) Norway since the early 1970s. The 2015 Survey was part of an international collaborative Survey using the vessels RV Celtic Explorer (Ireland), FV Fridtjof Nansen (Russia), RV Tridens (Netherlands) and the RV Magnus Heinason (Faroes). The total combined area coverage extended from the Faroe Islands in the north (62° N) to south of Ireland (51° N), with east -west extension from 4°-18° W. International Survey participants meet shortly after the Survey to present data and produce a combined relative abundance stock estimate and report. The combined Survey report is presented annually at the WGIPS meeting held in January. The information presented here relates specifically to the Irish Survey component
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Blue Whiting Acoustic Survey Cruise Report March 26- April 15, 2013
Marine Institute, 2013Co-Authors: O’donnell C., Johnston G., Mullins E., Keogh N.Abstract:Use the URI link below to search the Marine Institute Data Discovery Catalogue for datasets relevant to this report.Acoustic Surveys targeting blue whiting (Micromesistius poutassou) spawning and post spawning aggregations in the north east Atlantic have been carried out by the Institute of Marine Research (IMR) Norway since the early 1970s. In the early 1980s a coordinated Acoustic Survey approach was adopted, with both Russia and Norway participating to estimate the size of this migratory stock within the main spawning grounds to the west of Ireland and Britain. Since 2004, an International coordinated Survey program has expanded to include vessels from the EU (Ireland and the Netherlands) and the Faroes. Due to the highly migratory nature of the stock a large geographical area has to be Surveyed. Spawning takes place from January through to April along the shelf edge from the southern Porcupine Bank area northwards to the aroe/Shetland Ridge including offshore areas as the Rosemary, Hatton and Rockall Banks. Peak spawning occurs between mid-March and mid April and Acoustic Surveys are timed to occur during this phase. To facilitate a more coordinated spatio-temporal approach to the Survey participating countries meet annually to discuss Survey methods and define effort allocation at the ICES led Working Group International Pelagic Surveys (WGIPS). Data from the annual spawning stock abundance Survey (March/April, western waters), juvenile Surveys (May, Norwegian Sea and January-March, Barents Sea trawl Survey) and commercial landings data are presented annually at the ICES Working Group of Widely Distributed Stocks (WGWIDE). Ultimately, combined data inputs into the management and catch advice for this international cross boundary stock. The 2013 Survey was part of an international collaborative Survey using the vessels RV Celtic Explorer (Ireland), FV Vilnus (Russia), RV Tridens (Netherlands) and the RV Magnus Heinason (Faroes). The total combined area coverage extended from the Faroe Islands in the north (62° N) to south of Ireland (52° N), with east -west extension from 4°-19° W. International Survey participants meet shortly after the Survey to present data and produce a combined relative abundance and biomass index the blue whiting spawning stock in western waters. The combined Survey report is presented annually at the WGIPS meeting held in December. The information presented here relates to the Irish Survey
Mullins E. - One of the best experts on this subject based on the ideXlab platform.
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Atlantic Herring in 6aS/7b, Industry Acoustic Survey Cruise Report
Marine Institute, 2020Co-Authors: O’malley M., Smith T., Mullins E.Abstract:An Acoustic Survey of Atlantic herring Clupea harengus was conducted in ICES areas 6aS/7b in Dec 2019 using the research vessel RV Celtic Voyager and the fishing vessel MFV Ros Ard SO745. This Survey is the fourth in a time series that is hoped will be developed into a long-term index of spawning/pre-spawning herring in 6aS/7b. The Survey design is based on the predicted distribution of this winter spawning herring in this area. Poor weather negatively impacted the Survey in 2019, resulting in fewer transect miles completed and fewer strata areas covered than planned. In total, approximately 600nmi of cruise track was completed using 96 transects. This resulted in a total area coverage of approximately 606 nmi², a significant reduction compared to recent years. Parallel transect spacing was set at 3.5nmi for the Donegal Bay strata. Tightly spaced zig-zag transects were used in a relatively small area in Lough Swilly. A Simrad ES-120 7CD (120 kHz) split-beam echosounder was used to collect Acoustic raw data. The transducer was mounted on a towed body from the Celtic Voyager in Donegal Bay and was pole mounted from the Ros Ard in Lough Swilly. Very strong herring marks were evident in Lough Swilly in deepest part of the channel. The herring marks continued for many miles in the upper Swilly, an area where boats in the monitoring fishery had also concentrated effort. There were some herring marks in discreet areas around Drumanoo Head, Bruckless Bay and Inver Bay in the Donegal Bay Strata. Biological samples from the monitoring fishery of herring were used to augment the samples from the Survey. Herring samples were taken from boats fishing in Lough Swilly and Inver Bay as close spatially and temporally as possible to the Survey in these areas. Herring were dominated overall by 1- and 2-wr fish, (52% of the overall numbers) followed by relatively strong 3- and 5-wr cohorts. The total stock biomass (TSB) estimate of herring for the combined 6aS/7b area was 25,289 tonnes (Lough Swilly = 19,697 tonnes, Donegal Bay = 5,591 tonnes). This is considered to be a minimum estimate of herring in the 6aS/7b Survey area at the time of the Survey, and a significant decrease on the previous 3 years Surveys. The reduction in the Survey area completed as a consequence of the poor weather resulted in the Survey not containing the stock in 2019. However, the overall CV estimate on biomass and abundance for the Survey area completed is low (~0.17) in 2019. This is driven by the improved Survey design in Lough Swilly, with reduced transect spacing and increased transect miles in this strata. The CV for the Donegal Bay strata is relatively high (0.63), this is mostly caused by the over-reliance on a few Acoustic marks of herring in Bruckless and Inver Bays in particular and many transects with little or no herring marks. The Survey in 2019 had to be altered due to weather, requiring a change in design and approach. However, the template of focusing on discreet areas was generally successful and may provide a template for future designs, particularly when reduced effort is necessary during poor weather or resource limits
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Atlantic Herring and Horse Mackerel in 6aS/7b; Industry Acoustic Survey Cruise Report
Marine Institute, 2019Co-Authors: O'malley M., Blaszkowski M., White Emma, O'brien S., Mullins E.Abstract:An Acoustic Survey of Atlantic herring Clupea harengus and horse mackerel Trachurus trachurus was conducted in ICES areas 6aS/7b in Nov 2018 using the pair trawl vessels MFV Eilean Croine S238 and MFV Sparkling Star D437. This Survey is the third in a time series that is hoped will be developed into a long-term index of spawning/pre-spawning herring and horse mackerel in 6aS/7b, for use in stock assessments in the future. The Survey design was based on the predicted distribution of herring and horse mackerel in this area during this time. In total 1,400nmi of cruise track was completed using 37 transects and related to a total area coverage of approximately 5,600 nmi². Parallel transect spacing was set at 7.5nmi for the wider area strata, and 3.5nmi for Donegal Bay and Achill strata. Coverage extended from inshore coastal areas to the 200 m contour in the west and north where possible. A Survey was carried out in Lough Swilly using a zig-zag design. A Simrad ES-38B (38 kHz) split-beam transducer mounted on a towed body was used to collect Acoustic raw data. Very strong herring marks were evident in Lough Swilly, an area where boats in the monitoring fishery were concentrating effort. There were a few herring marks in discreet areas around Glen Head, Bruckless Bay, Inishmurray and Inishbofin. A total of four commercial fishing hauls on horse mackerel were completed during the Survey. Biological samples from the monitoring fishery of herring were used to augment the samples from the Survey. Herring samples were taken from boats fishing in Lough Swilly and Bruckless Bay as close spatially and temporally as possible to the Survey in these areas. Herring were dominated overall by 4-wr fish, 29% of the overall numbers. Horse mackerel were distributed throughout the Survey area, but particularly throughout the area to the north and west of the Stags of Broadhaven. Horse mackerel length distribution was dominated by a mode at 25-26cm. This corresponded to a dominance of 4-wr fish (~89%) in all of the samples. The total stock biomass (TSB) estimate of herring for the combined 6aS/7b area was 50,145 tonnes (Lough Swilly = 32,372 tonnes, Donegal Bay = 9,517 tonnes, NW area = 7,710 tonnes and the remaining Achill strata = 545 tonnes). This is considered to be a minimum estimate of herring in the 6aS/7b Survey area at the time of the Survey. The TSB estimate of horse mackerel for the total Surveyed area in 6aS/7b area was 57,162 tonnes, considered to be a minimum estimate of horse mackerel in the 6aS/7b Survey area at the time of the Survey. The CV estimates on biomass and abundance are high (~0.51 for herring and ~ 0.36 for horse mackerel) for the Survey in 2018. For herring, this is mostly caused by the over-reliance on a few Acoustic marks of herring in Lough Swilly and Bruckless Bay in particular. Horse mackerel are a widely distributed stock, therefore the stock was not contained by this Survey
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Blue Whiting Acoustic Survey cruise report, March 20- April 06, 2018
O'Donnell D. Johnston G. Mullins E. Keogh N. and Power J. (2018). Blue Whiting Acoustic Survey cruise report March 20- April 06 2018. FSS Survey Serie, 2018Co-Authors: O'donnell D., Johnston G., Keogh N., Mullins E., Power J.Abstract:Acoustic Surveys targeting blue whiting (Micromesistius poutassou) spawning and post spawning aggregations in the north east Atlantic have been carried out by the Institute of Marine Research (IMR) Norway since the early 1970s. The 2018 Survey was part of an international collaborative Survey using the vessels RV Celtic Explorer (Ireland), RV Tridens (Netherlands), FV Kings Bay (Norway) and the RV Magnus Heinason (Faroes). The total combined area coverage extended from the Faroe Islands in the north (62° N) to south of Ireland (51° N), with east -west extension from 1°-18° W. To the south of 51°N the Spanish research vessel the RV Miguel Oliver conducted a Survey, complimentary to, but separate to the IBWSS Survey, as part of their annual PELACUS Survey program. International Survey participants met shortly after the Survey to present data and produce a combined relative abundance stock estimate and report. The combined Survey report is presented annually at the WGIPS meeting held in January. The information presented here relates specifically to the Irish Survey unless otherwise stated
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Blue Whiting Acoustic Survey cruise report, March 19- April 11, 2017
Marine Institute, 2017Co-Authors: O'donnell D., Johnston G., Keogh N., Mullins E., O'callaghan S.Abstract:Acoustic Surveys on blue whiting (Micromesistius poutassou) spawning aggregations in the north east Atlantic have been carried out by the Institute of Marine Research (IMR) Norway since the early 1970s. The 2017 Survey was part of an international collaborative Survey using the vessels RV Celtic Explorer (Ireland), RV Tridens (Netherlands), FV Kings Bay (Norway) and the RV Magnus Heinason (Faroes). The total combined area coverage extended from the Faroe Islands in the north (62° N) to south of Ireland (51° N), with east -west extension from 1°-17° W. International Survey participants meet shortly after the Survey to present data and produce a combined relative abundance stock estimate and report. The combined Survey report is presented annually at the WGIPS meeting held in January. The information presented here relates specifically to the Irish Survey
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Blue Whiting Acoustic Survey Cruise Report March 26- April 15, 2013
Marine Institute, 2013Co-Authors: O’donnell C., Johnston G., Mullins E., Keogh N.Abstract:Use the URI link below to search the Marine Institute Data Discovery Catalogue for datasets relevant to this report.Acoustic Surveys targeting blue whiting (Micromesistius poutassou) spawning and post spawning aggregations in the north east Atlantic have been carried out by the Institute of Marine Research (IMR) Norway since the early 1970s. In the early 1980s a coordinated Acoustic Survey approach was adopted, with both Russia and Norway participating to estimate the size of this migratory stock within the main spawning grounds to the west of Ireland and Britain. Since 2004, an International coordinated Survey program has expanded to include vessels from the EU (Ireland and the Netherlands) and the Faroes. Due to the highly migratory nature of the stock a large geographical area has to be Surveyed. Spawning takes place from January through to April along the shelf edge from the southern Porcupine Bank area northwards to the aroe/Shetland Ridge including offshore areas as the Rosemary, Hatton and Rockall Banks. Peak spawning occurs between mid-March and mid April and Acoustic Surveys are timed to occur during this phase. To facilitate a more coordinated spatio-temporal approach to the Survey participating countries meet annually to discuss Survey methods and define effort allocation at the ICES led Working Group International Pelagic Surveys (WGIPS). Data from the annual spawning stock abundance Survey (March/April, western waters), juvenile Surveys (May, Norwegian Sea and January-March, Barents Sea trawl Survey) and commercial landings data are presented annually at the ICES Working Group of Widely Distributed Stocks (WGWIDE). Ultimately, combined data inputs into the management and catch advice for this international cross boundary stock. The 2013 Survey was part of an international collaborative Survey using the vessels RV Celtic Explorer (Ireland), FV Vilnus (Russia), RV Tridens (Netherlands) and the RV Magnus Heinason (Faroes). The total combined area coverage extended from the Faroe Islands in the north (62° N) to south of Ireland (52° N), with east -west extension from 4°-19° W. International Survey participants meet shortly after the Survey to present data and produce a combined relative abundance and biomass index the blue whiting spawning stock in western waters. The combined Survey report is presented annually at the WGIPS meeting held in December. The information presented here relates to the Irish Survey
Johnston G. - One of the best experts on this subject based on the ideXlab platform.
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Blue Whiting Acoustic Survey cruise report, March 20- April 06, 2018
O'Donnell D. Johnston G. Mullins E. Keogh N. and Power J. (2018). Blue Whiting Acoustic Survey cruise report March 20- April 06 2018. FSS Survey Serie, 2018Co-Authors: O'donnell D., Johnston G., Keogh N., Mullins E., Power J.Abstract:Acoustic Surveys targeting blue whiting (Micromesistius poutassou) spawning and post spawning aggregations in the north east Atlantic have been carried out by the Institute of Marine Research (IMR) Norway since the early 1970s. The 2018 Survey was part of an international collaborative Survey using the vessels RV Celtic Explorer (Ireland), RV Tridens (Netherlands), FV Kings Bay (Norway) and the RV Magnus Heinason (Faroes). The total combined area coverage extended from the Faroe Islands in the north (62° N) to south of Ireland (51° N), with east -west extension from 1°-18° W. To the south of 51°N the Spanish research vessel the RV Miguel Oliver conducted a Survey, complimentary to, but separate to the IBWSS Survey, as part of their annual PELACUS Survey program. International Survey participants met shortly after the Survey to present data and produce a combined relative abundance stock estimate and report. The combined Survey report is presented annually at the WGIPS meeting held in January. The information presented here relates specifically to the Irish Survey unless otherwise stated
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Blue Whiting Acoustic Survey cruise report, March 19- April 11, 2017
Marine Institute, 2017Co-Authors: O'donnell D., Johnston G., Keogh N., Mullins E., O'callaghan S.Abstract:Acoustic Surveys on blue whiting (Micromesistius poutassou) spawning aggregations in the north east Atlantic have been carried out by the Institute of Marine Research (IMR) Norway since the early 1970s. The 2017 Survey was part of an international collaborative Survey using the vessels RV Celtic Explorer (Ireland), RV Tridens (Netherlands), FV Kings Bay (Norway) and the RV Magnus Heinason (Faroes). The total combined area coverage extended from the Faroe Islands in the north (62° N) to south of Ireland (51° N), with east -west extension from 1°-17° W. International Survey participants meet shortly after the Survey to present data and produce a combined relative abundance stock estimate and report. The combined Survey report is presented annually at the WGIPS meeting held in January. The information presented here relates specifically to the Irish Survey
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Blue Whiting Acoustic Survey Cruise Report, March 22 - April 01, 2015
Marine Institute, 2015Co-Authors: O'donnell C., Nolan C., Johnston G., Keogh N., Van Der Knaap, Borawska A., O’donovan M.Abstract:Acoustic Surveys on blue whiting (Micromesistius poutassou) spawning aggregations in the north east Atlantic have been carried out by the Institute of Marine Research (IMR) Norway since the early 1970s. The 2015 Survey was part of an international collaborative Survey using the vessels RV Celtic Explorer (Ireland), FV Fridtjof Nansen (Russia), RV Tridens (Netherlands) and the RV Magnus Heinason (Faroes). The total combined area coverage extended from the Faroe Islands in the north (62° N) to south of Ireland (51° N), with east -west extension from 4°-18° W. International Survey participants meet shortly after the Survey to present data and produce a combined relative abundance stock estimate and report. The combined Survey report is presented annually at the WGIPS meeting held in January. The information presented here relates specifically to the Irish Survey component
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Blue Whiting Acoustic Survey Cruise Report March 26- April 15, 2013
Marine Institute, 2013Co-Authors: O’donnell C., Johnston G., Mullins E., Keogh N.Abstract:Use the URI link below to search the Marine Institute Data Discovery Catalogue for datasets relevant to this report.Acoustic Surveys targeting blue whiting (Micromesistius poutassou) spawning and post spawning aggregations in the north east Atlantic have been carried out by the Institute of Marine Research (IMR) Norway since the early 1970s. In the early 1980s a coordinated Acoustic Survey approach was adopted, with both Russia and Norway participating to estimate the size of this migratory stock within the main spawning grounds to the west of Ireland and Britain. Since 2004, an International coordinated Survey program has expanded to include vessels from the EU (Ireland and the Netherlands) and the Faroes. Due to the highly migratory nature of the stock a large geographical area has to be Surveyed. Spawning takes place from January through to April along the shelf edge from the southern Porcupine Bank area northwards to the aroe/Shetland Ridge including offshore areas as the Rosemary, Hatton and Rockall Banks. Peak spawning occurs between mid-March and mid April and Acoustic Surveys are timed to occur during this phase. To facilitate a more coordinated spatio-temporal approach to the Survey participating countries meet annually to discuss Survey methods and define effort allocation at the ICES led Working Group International Pelagic Surveys (WGIPS). Data from the annual spawning stock abundance Survey (March/April, western waters), juvenile Surveys (May, Norwegian Sea and January-March, Barents Sea trawl Survey) and commercial landings data are presented annually at the ICES Working Group of Widely Distributed Stocks (WGWIDE). Ultimately, combined data inputs into the management and catch advice for this international cross boundary stock. The 2013 Survey was part of an international collaborative Survey using the vessels RV Celtic Explorer (Ireland), FV Vilnus (Russia), RV Tridens (Netherlands) and the RV Magnus Heinason (Faroes). The total combined area coverage extended from the Faroe Islands in the north (62° N) to south of Ireland (52° N), with east -west extension from 4°-19° W. International Survey participants meet shortly after the Survey to present data and produce a combined relative abundance and biomass index the blue whiting spawning stock in western waters. The combined Survey report is presented annually at the WGIPS meeting held in December. The information presented here relates to the Irish Survey
