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Gerritsen H.d. - One of the best experts on this subject based on the ideXlab platform.
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Cruise report: Irish Anglerfish & Megrim Survey 2019
2019Co-Authors: Kelly E., Stokes D., Moore S.j., White J., O'cuaig M., Bouch P., Gerritsen H.d.Abstract:The 2019 Irish Anglerfish and Megrim Survey (IAMS) took place from 1-25th March (area 7bcjk) and 16-25th April 2019 (area 6a) on RV Celtic Explorer. The main objective of the survey is to obtain biomass and abundance indices for anglerfish (Lophius piscatorius and L. budegassa) and megrim (Lepidorhombus whiffiagonis and L. boscii) in areas 6a (south of 58°N) and 7 (west of 8°W). Secondary objectives are to collect data on the distribution, relative abundance and biology of other commercially exploited species. This year, additional sampling took place in deep water (up to 1,500m) in order to monitor the recovery of exploited deep-water species following the decline of the deep-water fisheries in Irish waters. The IAMS survey is coordinated with the Scottish Anglerfish and Megrim Survey (SIAMISS) and uses the same gear and fishing practices
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Cruise report: Irish Anglerfish & Megrim Survey 2017
2018Co-Authors: Gerritsen H.d., Kelly E., Stokes D., O'hea B., Ni Chonchuir G.Abstract:The 2017 Irish Anglerfish and Megrim Survey (IAMS) took place from 14th February to 7th March (area 7bcjk) and 8-17th April 2017 (area 6a) on RV Celtic Explorer. The main objective of the survey is to obtain biomass estimates for anglerfish (Lophius piscatorius and L. budegassa) and establish an abundance index for megrim (Lepidorhombus whiffiaginis and L. boscii) in areas 6a (south of 58°N) and 7 (west of 8°W). Secondary objectives are to collect data on the distribution and relative abundance of anglerfish, megrim and other commercially exploited species. The survey also collects maturity and other biological information for commercial fish species. The IAMS survey is coordinated with the Scottish Anglerfish and Megrim Survey (SIAMISS) and uses the same gear and fishing practices
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Cruise report: Irish Anglerfish & Megrim Survey 2018
2018Co-Authors: Gerritsen H.d., Kelly E., Stokes D., Moore S.j., White J.Abstract:The 2018 Irish Anglerfish and Megrim Survey (IAMS) took place from 20th February to 19th March (area 7bcjk) and 10-21st April 2018 (area 6a) on RV Celtic Explorer. The main objective of the survey is to obtain biomass estimates for anglerfish (Lophius piscatorius and L. budegassa) and establish an abundance index for megrim (Lepidorhombus whiffiagonis and L. boscii) in areas 6a (south of 58°N) and 7 (west of 8°W). Secondary objectives are to collect data on the distribution and relative abundance of anglerfish, megrim and other commercially exploited species. The survey also collects maturity and other biological information for commercial fish species. The IAMS survey is coordinated with the Scottish Anglerfish and Megrim Survey (SIAMISS) and uses the same gear and fishing practices
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Cruise report: Irish Anglerfish & Megrim Survey 2016
2018Co-Authors: Gerritsen H.d., Kelly E., Stokes D., Ni Chonchuir G., Moore S.j.Abstract:The 2016 Irish Anglerfish and Megrim Survey (IAMS) took place from 4-24th January and 25th February to 6th March 2016 on RV Celtic Explorer. The main objective of the survey is to obtain biomass estimates for anglerfish (Lophius piscatorius and L. budegassa) in and establish an abundance index for megrim (Lepidorhombus whiffiaginis and L. boscii) in VIa (south of 58°N) and VII (west of 8°W). Secondary objectives are to collect data on the distribution and relative abundance of anglerfish, megrim and other commercially exploited species. The survey also collects maturity and other biological information for commercial fish species. The IAMS survey is coordinated with the Scottish Anglerfish and Megrim survey (SIAMISS) and uses the same gear and fishing practices
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Cruise Report: Irish Beam trawl Ecosystem Survey 2016
2018Co-Authors: Gerritsen H.d.Abstract:The first annual Irish Beam trawl Ecosystem (IBES) took place from 6-16th March 2016 on RV Celtic Explorer in the western Celtic sea. The main objective of the survey is to connect the Irish Anglerfish and Megrim Survey (IAMS) to the UK beam trawl surveys in the Celtic Sea, English Channel and Irish Sea, with the purpose of providing a swept-area biomass estimate for anglerfish (Lophius piscatorius and L. budegassa) in area VII. Secondary objectives are to collect data on the distribution and relative abundance of commercially exploited species as well as invertebrates and by-catch species, particularly vulnerable and indicator species. The survey also collects maturity and other biological information for commercial fish species in the western Celtic Sea. The IBES survey is coordinated with the CEFAS Q1 South-west Ecosystem Survey (Q1SWECOS) and uses the same gear and methods
Jorge Landa - One of the best experts on this subject based on the ideXlab platform.
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estimation of age and growth of juvenile angler Lophius piscatorius in the bay of biscay from otolith microstructure analysis
2019Co-Authors: C Hernandez, Jorge Landa, Joaquín Barrado, Ana Antolinez, Begona VillamorAbstract:Abstract The early life history of the angler Lophius piscatorius in the Bay of Biscay was investigated by growth increments in the lapillar otoliths, this being the first time this type of analysis was conducted for this species among specimens of the Iberian stock (ICES Divisions 8.c, 9.a). Lapilli of 34 juvenile fish collected during autumn bottom trawl surveys, were successfully aged between 113 and 198 days (116–213 mm fish length). Morphology and ultrastructure analyses of the otolith’s check marks enabled us to determine the period of endogenous feeding (which according to these estimations would last between 9 and 19 days after hatching), as well as the settlement check, which indicated a relatively long pelagic phase (ca. 91 days). Hatch date was back-calculated from the date of capture indicating a spawning period from April to June, in agreement with that estimated for this population. The age–length relationship was described by the linear function L T = 7 . 30 + 0.98 age (days) and showed an average growth rate of 0.98 mm day−1. Our results present a faster growth pattern of 0+ juveniles L. piscatorius in the Bay of Biscay than previously estimated by annual growth studies, showing that juveniles of up to 213 mm length collected in October were hatched in the same year and belonged to age class 0. These results are relevant to the knowledge of the early life history of this species and are in agreement with those obtained in the only previous microstructural study of L. piscatorius in Atlantic waters. The implications of these findings on the annual age estimation protocol based on illicia are discussed.
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spatial temporal and bathymetric distribution patterns of the parasite chondracanthus lophii of anglerfish Lophius piscatorius in the northeast atlantic
2013Co-Authors: Lucía Cañás, Paz Sampedro, Celso A Farina, Jorge LandaAbstract:Abstract Anglerfish (Lophius piscatorius) collected from several locations in the southwestern European waters (from southwest of Ireland to northwest of Spain) were examined for the parasitic copepod Chondracanthus lophii in 2007, 2008 and 2009. The influence of host size, time (season, year) and spatial variables (geographical area, depth, latitude and longitude) on the infestation variability was studied. Zero-altered models (ZAMs) and generalized additive models (GAMs) were used to assess the prevalence and intensity of infection related to the variables studied. The variables which proved to have the greatest effects on the infestation were host size and geographical area, while the impact of variables such as year and season turned out to be less evident. Abundance, prevalence and intensity of C. lophii increased with host size. The highest infestation levels were recorded in the West of Ireland and on the Porcupine Bank, and within these areas the parasite load increased with latitude. Prevalence o...
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Age and growth of anglerfish (Lophius piscatorius) on the Porcupine Bank (west of Ireland) based on illicia age estimation.
2013Co-Authors: Jorge Landa, Joaquín Barrado, Francisco VelascoAbstract:Abstract The age of white anglerfish ( Lophius piscatorius ) on the Porcupine Bank was estimated based on the age estimation of 979 illicia (first dorsal fin ray) obtained from a series of 9 annual groundfish surveys (2001–2009). Modifications in the methodology of illicia preparation and in the traditional biased age estimation criterion are presented. This is the first time that a growth pattern of white anglerfish based on illicia age estimations can be indirectly validated by tracking cohorts using the abundance indices per age class from surveys and length-frequency analyses. Previous studies of cohort tracking using the traditional illicia age estimation criterion showed a mismatch, suggesting a faster growth. With the new proposed criteria, abundant cohorts from 2001 to 2004, and scarce ones, from 2005 to 2007, can be tracked over the time throughout several age groups. A new growth pattern and von Bertalanffy growth parameters are presented ( L ∞ : 162.31; k : 0.088; t 0 : −0.894). The results are compared with previous studies in other areas.
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Distribution, abundance, and growth of anglerfish (Lophius piscatorius) on the Porcupine Bank (west of Ireland)
2008Co-Authors: Francisco Velasco, Jorge Landa, Joaquín Barrado, M. BlancoAbstract:Velasco, F., Landa, J., Barrado, J., and Blanco, M. 2008. Distribution, abundance, and growth of anglerfish (Lophius piscatorius) on the Porcupine Bank (west of Ireland). - ICES Journal of Marine Science, 65: 1316-1325.This manuscript presents the first results on abundance and distribution of white anglerfish (Lophius piscatorius) from a series of groundfish surveys carried out on the Porcupine Bank. White anglerfish were caught in all trawlable areas, recruits and juveniles mainly from the shallower parts of the bank, around the central mound and closer to the Irish shelf. A strong cohort was manifest in 2001, and it could be tracked over time by age matrices obtained with illicia age-length keys (ALKs) collected during the surveys. However, a mismatch in the cohort analysis suggests that the growth pattern based on illicia underestimates around three of the younger age classes. Using an ALK estimated numerically from a faster growth model, this mismatch disappears, which seems to confirm faster growth. Recruits of the 0-group and adults of age 4 (with the faster growth: ca. ∼57-65 cm) dominated, whereas the intermediate age groups were scarce on the bank. These results and recent findings from tag-and-recapture experiments suggest that white anglerfish move to and from the Porcupine Bank, calling into question the stock boundaries currently accepted for the species in the North Atlantic.
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Growth of white anglerfish (Lophius piscatorius) tagged in the Northeast Atlantic, and a review of age studies on anglerfish
2007Co-Authors: Jorge Landa, Rafael Duarte, Iñaki QuincocesAbstract:Landa, J., Duarte, R., and Quincoces, I. 2008. Growth of white anglerfish (Lophius piscatorius) tagged in the Northeast Atlantic, and a review of age studies on anglerfish. - ICES Journal of Marine Science, 65: 72-80.Growth of white anglerfish was estimated from the results of a tagging study in south European waters. In all, 1326 fish, caught by bottom trawl and gillnet commercial vessels and on trawl surveys, were tagged from 1995 to 2004; 50 were recovered, and a growth rate of 13.6 cm year −1 was estimated from the four fish at liberty long enough to allow extrapolation of the growth rate to an annual period. Growth patterns were reviewed based on available studies of growth verification of white anglerfish in Atlantic waters, including another tag-recapture study, length-frequency of catches, and microstructure analysis of hard parts. The growth rate estimated from these studies showed many similarities, and an overall growth pattern was estimated: growth rate = 18.24e -0.015length . A von Bertalanffy growth curve fitted to all data yielded the parameter values L ∞ = 140 cm and k = 0.11. This growth rate is faster than estimated recently using illicia for age estimation, but similar to that found in the first studies that used illicia and sectioned otoliths. Current estimates of growth based on illicia, which are used in assessing the northern European stock of white anglerfish, seem to be underestimated.
Recasens Laura - One of the best experts on this subject based on the ideXlab platform.
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Alternativas de esfuerzo de pesca para la gestión de las pesquerías demersales en el Mediterráneo occidental
2019Co-Authors: Martín Paloma, Maynou Francesc, Garriga Mariona, Ramirez John, Recasens LauraAbstract:Management alternatives based on fishing effort for the demersal fisheries in the western Mediterranean were tested, with the novelty of examining management alternatives at temporal scales smaller than one year. Nine scenarios were considered on the basis of input control: decrease in the number of fishing days, which may correspond to cessation of activity of vessels or lower activity of the fleet; and implementation of seasonal closures of one-, two- and three-month duration in winter, spring, summer and autumn. The approach is based on a multispecies and multigear bioeconomic model. We selected a total of ten species (Merluccius merluccius, Nephrops norvegicus, Mullus barbatus, Mullus surmuletus, Parapenaeus longirostris, Lophius piscatorius, Lophius budegassa, Aristeus antennatus, Phycis blennoides and Lepidorhombus boscii) and seven fleets, defined as a combination of fishing gear (bottom trawl, entangling nets and longline) and fleet segment. A similar decrease in F is achieved with a 20% reduction of fishing effort (days) or with two- to three-month closures. Maximum Sustainable Yield (MSY) for all stocks would be achieved only with such a drastic reduction of fishing effort ( > 80% of fishing days by the end of the five years of simulation) that, in practice, its application can be considered unrealistic, since it would represent a very low activity of all fishing fleets over the year.Se investigaron alternativas de gestión, basadas en el esfuerzo de pesca, para las pesquerías demersales del Mediterráneo occidental, con la novedad de analizar alternativas de gestión a escalas temporales inferiores a 1 año. Se consideraron nueve escenarios basados en control de entrada: disminución en el número de días de pesca, que puede corresponder a cese de actividad de las embarcaciones o a una menor actividad de la flota; y aplicación de vedas temporales de 1,2 y 3 meses de duración, en invierno, primavera, verano y otoño. Se ha trabajado con un modelo bioeconómico, multi-especies y multi-arte. Se seleccionó un total de 10 especies (Merluccius merluccius, Nephrops norvegicus, Mullus barbatus, Mullus surmuletus, Parapenaeus longirostris, Lophius piscatorius, Lophius budegassa, Aristeus antennatus, Phycis blennoides, Lepidorhombus boscii) y 7 flotas, definidas como una combinación de arte de pesca (arrastre de fondo, redes de enmalle y palangre) y segmento de flota. Se consigue un mismo descenso en F con una reducción del 20% del esfuerzo de pesca (días de pesca) o con vedas de 2-3 meses de duración. MSY para todos los stocks se alcanzaría con una reducción tan drástica del esfuerzo de pesca ( > 80% de los días de pesca al final de los cinco años de simulación) que, en la práctica, puede considerarse su aplicación no realista, ya que representaría una actividad muy baja de las flotas durante el año
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Alternativas de esfuerzo de pesca para la gestión de las pesquerías demersales en el Mediterráneo occidental
2019Co-Authors: Martín Paloma, Maynou Francesc, Garriga Mariona, Ramirez John, Recasens LauraAbstract:12 pages, 5 figures, 9 tables[EN] Management alternatives based on fishing effort for the demersal fisheries in the western Mediterranean were tested, with the novelty of examining management alternatives at temporal scales smaller than one year. Nine scenarios were considered on the basis of input control: decrease in the number of fishing days, which may correspond to cessation of activity of vessels or lower activity of the fleet; and implementation of seasonal closures of one-, two- and three-month duration in winter, spring, summer and autumn. The approach is based on a multispecies and multigear bioeconomic model. We selected a total of ten species (Merluccius merluccius, Nephrops norvegicus, Mullus barbatus, Mullus surmuletus, Parapenaeus longirostris, Lophius piscatorius, Lophius budegassa, Aristeus antennatus, Phycis blennoides and Lepidorhombus boscii) and seven fleets, defined as a combination of fishing gear (bottom trawl, entangling nets and longline) and fleet segment. A similar decrease in F is achieved with a 20% reduction of fishing effort (days) or with two- to three-month closures. Maximum Sustainable Yield (MSY) for all stocks would be achieved only with such a drastic reduction of fishing effort ( > 80% of fishing days by the end of the five years of simulation) that, in practice, its application can be considered unrealistic, since it would represent a very low activity of all fishing fleets over the year[ES] Se investigaron alternativas de gestión, basadas en el esfuerzo de pesca, para las pesquerías demersales del Mediterráneo occidental, con la novedad de analizar alternativas de gestión a escalas temporales inferiores a 1 año. Se consideraron nueve escenarios basados en control de entrada: disminución en el número de días de pesca, que puede corresponder a cese de actividad de las embarcaciones o a una menor actividad de la flota; y aplicación de vedas temporales de 1,2 y 3 meses de duración, en invierno, primavera, verano y otoño. Se ha trabajado con un modelo bioeconómico, multi-especies y multi-arte. Se seleccionó un total de 10 especies (Merluccius merluccius, Nephrops norvegicus, Mullus barbatus, Mullus surmuletus, Parapenaeus longirostris, Lophius piscatorius, Lophius budegassa, Aristeus antennatus, Phycis blennoides, Lepidorhombus boscii) y 7 flotas, definidas como una combinación de arte de pesca (arrastre de fondo, redes de enmalle y palangre) y segmento de flota. Se consigue un mismo descenso en F con una reducción del 20% del esfuerzo de pesca (días de pesca) o con vedas de 2-3 meses de duración. MSY para todos los stocks se alcanzaría con una reducción tan drástica del esfuerzo de pesca (>80% de los días de pesca al final de los cinco años de simulación) que, en la práctica, puede considerarse su aplicación no realista, ya que representaría una actividad muy baja de las flotas durante el añoThis study was partially funded by the project DRuMFISH (EASME/EMFF/2014/1.3.2.4/SI2.721116)Peer Reviewe
Moore S.j. - One of the best experts on this subject based on the ideXlab platform.
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Cruise report: Irish Anglerfish & Megrim Survey 2019
2019Co-Authors: Kelly E., Stokes D., Moore S.j., White J., O'cuaig M., Bouch P., Gerritsen H.d.Abstract:The 2019 Irish Anglerfish and Megrim Survey (IAMS) took place from 1-25th March (area 7bcjk) and 16-25th April 2019 (area 6a) on RV Celtic Explorer. The main objective of the survey is to obtain biomass and abundance indices for anglerfish (Lophius piscatorius and L. budegassa) and megrim (Lepidorhombus whiffiagonis and L. boscii) in areas 6a (south of 58°N) and 7 (west of 8°W). Secondary objectives are to collect data on the distribution, relative abundance and biology of other commercially exploited species. This year, additional sampling took place in deep water (up to 1,500m) in order to monitor the recovery of exploited deep-water species following the decline of the deep-water fisheries in Irish waters. The IAMS survey is coordinated with the Scottish Anglerfish and Megrim Survey (SIAMISS) and uses the same gear and fishing practices
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Cruise report: Irish Anglerfish & Megrim Survey 2018
2018Co-Authors: Gerritsen H.d., Kelly E., Stokes D., Moore S.j., White J.Abstract:The 2018 Irish Anglerfish and Megrim Survey (IAMS) took place from 20th February to 19th March (area 7bcjk) and 10-21st April 2018 (area 6a) on RV Celtic Explorer. The main objective of the survey is to obtain biomass estimates for anglerfish (Lophius piscatorius and L. budegassa) and establish an abundance index for megrim (Lepidorhombus whiffiagonis and L. boscii) in areas 6a (south of 58°N) and 7 (west of 8°W). Secondary objectives are to collect data on the distribution and relative abundance of anglerfish, megrim and other commercially exploited species. The survey also collects maturity and other biological information for commercial fish species. The IAMS survey is coordinated with the Scottish Anglerfish and Megrim Survey (SIAMISS) and uses the same gear and fishing practices
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Cruise report: Irish Anglerfish & Megrim Survey 2016
2018Co-Authors: Gerritsen H.d., Kelly E., Stokes D., Ni Chonchuir G., Moore S.j.Abstract:The 2016 Irish Anglerfish and Megrim Survey (IAMS) took place from 4-24th January and 25th February to 6th March 2016 on RV Celtic Explorer. The main objective of the survey is to obtain biomass estimates for anglerfish (Lophius piscatorius and L. budegassa) in and establish an abundance index for megrim (Lepidorhombus whiffiaginis and L. boscii) in VIa (south of 58°N) and VII (west of 8°W). Secondary objectives are to collect data on the distribution and relative abundance of anglerfish, megrim and other commercially exploited species. The survey also collects maturity and other biological information for commercial fish species. The IAMS survey is coordinated with the Scottish Anglerfish and Megrim survey (SIAMISS) and uses the same gear and fishing practices
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Cruise report: Irish Beam trawl Ecosystem Survey 2017
2018Co-Authors: Gerritsen H.d., Moore S.j.Abstract:The second annual Irish Beam trawl Ecosystem (IBES) took place from 7-16th March 2017 on RV Celtic Explorer in the western Celtic sea. The main objective of the survey is to connect the Irish Anglerfish and Megrim Survey (IAMS) to the UK beam trawl surveys in the Celtic Sea, English Channel and Irish Sea, with the purpose of providing a swept-area biomass estimate for anglerfish (Lophius piscatorius and L. budegassa) in area VII. Secondary objectives are to collect data on the distribution and relative abundance of commercially exploited species as well as invertebrates and by-catch species, particularly vulnerable and indicator species. The survey also collects maturity and other biological information for commercial fish species in the western Celtic Sea. The IBES survey uses the same gear, methods and stratification as the CEFAS Q1 South-west Ecosystem Survey (Q1SWECOS). The IBES survey is formally coordinated by the ICES Working Group on Beam Trawl Survey
Ni Chonchuir G. - One of the best experts on this subject based on the ideXlab platform.
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Cruise report: Irish Anglerfish & Megrim Survey 2017
2018Co-Authors: Gerritsen H.d., Kelly E., Stokes D., O'hea B., Ni Chonchuir G.Abstract:The 2017 Irish Anglerfish and Megrim Survey (IAMS) took place from 14th February to 7th March (area 7bcjk) and 8-17th April 2017 (area 6a) on RV Celtic Explorer. The main objective of the survey is to obtain biomass estimates for anglerfish (Lophius piscatorius and L. budegassa) and establish an abundance index for megrim (Lepidorhombus whiffiaginis and L. boscii) in areas 6a (south of 58°N) and 7 (west of 8°W). Secondary objectives are to collect data on the distribution and relative abundance of anglerfish, megrim and other commercially exploited species. The survey also collects maturity and other biological information for commercial fish species. The IAMS survey is coordinated with the Scottish Anglerfish and Megrim Survey (SIAMISS) and uses the same gear and fishing practices
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Cruise report: Irish Anglerfish & Megrim Survey 2016
2018Co-Authors: Gerritsen H.d., Kelly E., Stokes D., Ni Chonchuir G., Moore S.j.Abstract:The 2016 Irish Anglerfish and Megrim Survey (IAMS) took place from 4-24th January and 25th February to 6th March 2016 on RV Celtic Explorer. The main objective of the survey is to obtain biomass estimates for anglerfish (Lophius piscatorius and L. budegassa) in and establish an abundance index for megrim (Lepidorhombus whiffiaginis and L. boscii) in VIa (south of 58°N) and VII (west of 8°W). Secondary objectives are to collect data on the distribution and relative abundance of anglerfish, megrim and other commercially exploited species. The survey also collects maturity and other biological information for commercial fish species. The IAMS survey is coordinated with the Scottish Anglerfish and Megrim survey (SIAMISS) and uses the same gear and fishing practices
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Cruise report: Irish Beam trawl Ecosystem Survey 2018
2018Co-Authors: Gerritsen H.d., Kelly E., O'hea B., Ni Chonchuir G.Abstract:The third annual Irish Beam trawl Ecosystem (IBES) took place from 9-19th March 2018 on RV Celtic Explorer in the western Celtic sea. The main objective of IBES is to extend the geographic range of the CEFAS Q1 South-west Ecosystem Survey (Q1SWECOS), with the purpose of providing a swept-area biomass estimate for anglerfish (Lophius piscatorius and L. budegassa) in the Celtic Sea (ICES area VII). Secondary objectives are to collect data on the distribution and relative abundance of commercially exploited species as well as invertebrates and by-catch species, particularly vulnerable and indicator species. The survey also collects maturity and other biological information for commercial fish species in the western Celtic Sea. The IBES survey uses the same gear, methods and stratification as the Q1SWECOS. The IBES survey is formally coordinated by the ICES Working Group on Beam Trawl Survey
