Putative fishery-induced changes in biomass and population size structures of demersal deep-sea fishes in ICES Sub-area VII, Northeast Atlantic Ocean
A time series from 1977–1989 and 2000–2002 of scientific trawl surveys in the Porcupine Seabight and adjacent abyssal plain of the NE Atlantic was analysed to assess changes in demersal fish biomass and length frequency. These two periods coincide with the onset of the commercial deep-water fishery...
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ftdoajarticles:oai:doaj.org/article:9f1ad50208644cf5bf9870331e00c373 2023-05-15T17:41:37+02:00 Putative fishery-induced changes in biomass and population size structures of demersal deep-sea fishes in ICES Sub-area VII, Northeast Atlantic Ocean J. A. Godbold D. M. Bailey M. A. Collins J. D. M. Gordon W. A. Spallek I. G. Priede 2013-01-01T00:00:00Z https://doi.org/10.5194/bg-10-529-2013 https://doaj.org/article/9f1ad50208644cf5bf9870331e00c373 EN eng Copernicus Publications http://www.biogeosciences.net/10/529/2013/bg-10-529-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-529-2013 1726-4170 1726-4189 https://doaj.org/article/9f1ad50208644cf5bf9870331e00c373 Biogeosciences, Vol 10, Iss 1, Pp 529-539 (2013) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/bg-10-529-2013 2022-12-31T15:03:29Z A time series from 1977–1989 and 2000–2002 of scientific trawl surveys in the Porcupine Seabight and adjacent abyssal plain of the NE Atlantic was analysed to assess changes in demersal fish biomass and length frequency. These two periods coincide with the onset of the commercial deep-water fishery in the late 1970s and the onset of the regulation of the fishery in the early 2000's, which allowed us to investigate changes in the relationship between total demersal fish biomass and depth between the pre- and post commercial fishing periods, as well as changes in the biomass (kg km −2 ) depth distribution and length frequency distribution of the most dominant fish species. Our results show a decline in total demersal fish biomass of 36% within the depth range of the commercial fishery (< 1500 m). Whilst there were significant declines in target (e.g. Coryphaenoides rupestris decreased by 57%) and non-target (e.g. C. guentheri and Antimora rostrata ) species, not all species declined significantly. Changes in the overall length-frequency distribution were detected for 5 out of the 8 dominant species occupying depth ranges both within and outside the maximum depth for commercial trawling. This suggests that whilst there is evidence for likely fishery impacts on the biomass distribution of the demersal fish population as a whole, species-specific impacts are highly variable. It is clear that changes in population structure can extend beyond the depth at which fishing takes place, highlighting the importance for also considering the indirect effects on deep-sea fish populations. Article in Journal/Newspaper Northeast Atlantic Directory of Open Access Journals: DOAJ Articles Porcupine Seabight ENVELOPE(-13.000,-13.000,50.500,50.500) Biogeosciences 10 1 529 539 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 J. A. Godbold D. M. Bailey M. A. Collins J. D. M. Gordon W. A. Spallek I. G. Priede Putative fishery-induced changes in biomass and population size structures of demersal deep-sea fishes in ICES Sub-area VII, Northeast Atlantic Ocean |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
A time series from 1977–1989 and 2000–2002 of scientific trawl surveys in the Porcupine Seabight and adjacent abyssal plain of the NE Atlantic was analysed to assess changes in demersal fish biomass and length frequency. These two periods coincide with the onset of the commercial deep-water fishery in the late 1970s and the onset of the regulation of the fishery in the early 2000's, which allowed us to investigate changes in the relationship between total demersal fish biomass and depth between the pre- and post commercial fishing periods, as well as changes in the biomass (kg km −2 ) depth distribution and length frequency distribution of the most dominant fish species. Our results show a decline in total demersal fish biomass of 36% within the depth range of the commercial fishery (< 1500 m). Whilst there were significant declines in target (e.g. Coryphaenoides rupestris decreased by 57%) and non-target (e.g. C. guentheri and Antimora rostrata ) species, not all species declined significantly. Changes in the overall length-frequency distribution were detected for 5 out of the 8 dominant species occupying depth ranges both within and outside the maximum depth for commercial trawling. This suggests that whilst there is evidence for likely fishery impacts on the biomass distribution of the demersal fish population as a whole, species-specific impacts are highly variable. It is clear that changes in population structure can extend beyond the depth at which fishing takes place, highlighting the importance for also considering the indirect effects on deep-sea fish populations. |
format |
Article in Journal/Newspaper |
author |
J. A. Godbold D. M. Bailey M. A. Collins J. D. M. Gordon W. A. Spallek I. G. Priede |
author_facet |
J. A. Godbold D. M. Bailey M. A. Collins J. D. M. Gordon W. A. Spallek I. G. Priede |
author_sort |
J. A. Godbold |
title |
Putative fishery-induced changes in biomass and population size structures of demersal deep-sea fishes in ICES Sub-area VII, Northeast Atlantic Ocean |
title_short |
Putative fishery-induced changes in biomass and population size structures of demersal deep-sea fishes in ICES Sub-area VII, Northeast Atlantic Ocean |
title_full |
Putative fishery-induced changes in biomass and population size structures of demersal deep-sea fishes in ICES Sub-area VII, Northeast Atlantic Ocean |
title_fullStr |
Putative fishery-induced changes in biomass and population size structures of demersal deep-sea fishes in ICES Sub-area VII, Northeast Atlantic Ocean |
title_full_unstemmed |
Putative fishery-induced changes in biomass and population size structures of demersal deep-sea fishes in ICES Sub-area VII, Northeast Atlantic Ocean |
title_sort |
putative fishery-induced changes in biomass and population size structures of demersal deep-sea fishes in ices sub-area vii, northeast atlantic ocean |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/bg-10-529-2013 https://doaj.org/article/9f1ad50208644cf5bf9870331e00c373 |
long_lat |
ENVELOPE(-13.000,-13.000,50.500,50.500) |
geographic |
Porcupine Seabight |
geographic_facet |
Porcupine Seabight |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Biogeosciences, Vol 10, Iss 1, Pp 529-539 (2013) |
op_relation |
http://www.biogeosciences.net/10/529/2013/bg-10-529-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-529-2013 1726-4170 1726-4189 https://doaj.org/article/9f1ad50208644cf5bf9870331e00c373 |
op_doi |
https://doi.org/10.5194/bg-10-529-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
1 |
container_start_page |
529 |
op_container_end_page |
539 |
_version_ |
1766143275643699200 |