Long-term changes in the diversity, abundance and size composition of deep sea demersal teleosts from the Azores assessed through surveys and commercial landings
To obtain important baseline information about population dynamics and to provide valuable insights about the possible effects of artisanal fishing on the demersal fish community, this study had three specific objectives: (1) to update the annotated list of demersal teleost species occurring in the...
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ftdoajarticles:oai:doaj.org/article:c6268c072eb24544ba453854600a4dcc 2023-10-09T21:54:10+02:00 Long-term changes in the diversity, abundance and size composition of deep sea demersal teleosts from the Azores assessed through surveys and commercial landings Santos Régis V.S. Silva Wendell M.M.L. Novoa-Pabon Ana M. Silva Hélder M. Pinho Mario R. 2019-01-01T00:00:00Z https://doi.org/10.1051/alr/2019022 https://doaj.org/article/c6268c072eb24544ba453854600a4dcc EN eng EDP Sciences https://www.alr-journal.org/articles/alr/full_html/2019/01/alr190027/alr190027.html https://doaj.org/toc/1765-2952 1765-2952 doi:10.1051/alr/2019022 https://doaj.org/article/c6268c072eb24544ba453854600a4dcc Aquatic Living Resources, Vol 32, p 25 (2019) check-list deep-sea fish abundance population dynamics management ices subdivision 10a2 Aquaculture. Fisheries. Angling SH1-691 article 2019 ftdoajarticles https://doi.org/10.1051/alr/2019022 2023-09-10T00:42:26Z To obtain important baseline information about population dynamics and to provide valuable insights about the possible effects of artisanal fishing on the demersal fish community, this study had three specific objectives: (1) to update the annotated list of demersal teleost species occurring in the Azores (mid-North Atlantic); (2) to describe their depth distribution and related fishery information; and (3) to evaluate annual changes in their observed abundance and length composition. To do this, a time series with about 25 years of scientific data from the commercial fishery and surveys was analyzed. The demersal teleost community was represented by 213 species, predominantly deep-water species, reflecting the main marine habitat in the Azores region. Fishery takes place mainly in the intermediate strata (200–600 m), where the most commercially important species occur. No changing in the fork length (LF) distribution toward small individuals caused by size-selective fishing was detected in this study. The high variability observed in the LF data indicates the need for more accurate studies considering alternative statistical analyses (e.g., generalised linear models) to examine the possible factors (e.g. depth coverage, gear configuration, soak time, and fishing area) that cause this variability. On the other hand, the abundance indices of some commercially important species appear to have declined (Phycis phycis, Pontinus kuhlii, Conger conger, Beryx splendens and B. decadactylus), while others appear to be more stable (Helicolenus dactylopterus) or even increasing (Mora moro). Although the available data are insufficient for a formal assessment on the status of exploited populations, the long-term analysis of commercial landings and survey data was used as a basis to assess deep sea demersal teleost fisheries of the Azores, under a precautionary approach. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Aquatic Living Resources 32 25 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
check-list deep-sea fish abundance population dynamics management ices subdivision 10a2 Aquaculture. Fisheries. Angling SH1-691 |
spellingShingle |
check-list deep-sea fish abundance population dynamics management ices subdivision 10a2 Aquaculture. Fisheries. Angling SH1-691 Santos Régis V.S. Silva Wendell M.M.L. Novoa-Pabon Ana M. Silva Hélder M. Pinho Mario R. Long-term changes in the diversity, abundance and size composition of deep sea demersal teleosts from the Azores assessed through surveys and commercial landings |
topic_facet |
check-list deep-sea fish abundance population dynamics management ices subdivision 10a2 Aquaculture. Fisheries. Angling SH1-691 |
description |
To obtain important baseline information about population dynamics and to provide valuable insights about the possible effects of artisanal fishing on the demersal fish community, this study had three specific objectives: (1) to update the annotated list of demersal teleost species occurring in the Azores (mid-North Atlantic); (2) to describe their depth distribution and related fishery information; and (3) to evaluate annual changes in their observed abundance and length composition. To do this, a time series with about 25 years of scientific data from the commercial fishery and surveys was analyzed. The demersal teleost community was represented by 213 species, predominantly deep-water species, reflecting the main marine habitat in the Azores region. Fishery takes place mainly in the intermediate strata (200–600 m), where the most commercially important species occur. No changing in the fork length (LF) distribution toward small individuals caused by size-selective fishing was detected in this study. The high variability observed in the LF data indicates the need for more accurate studies considering alternative statistical analyses (e.g., generalised linear models) to examine the possible factors (e.g. depth coverage, gear configuration, soak time, and fishing area) that cause this variability. On the other hand, the abundance indices of some commercially important species appear to have declined (Phycis phycis, Pontinus kuhlii, Conger conger, Beryx splendens and B. decadactylus), while others appear to be more stable (Helicolenus dactylopterus) or even increasing (Mora moro). Although the available data are insufficient for a formal assessment on the status of exploited populations, the long-term analysis of commercial landings and survey data was used as a basis to assess deep sea demersal teleost fisheries of the Azores, under a precautionary approach. |
format |
Article in Journal/Newspaper |
author |
Santos Régis V.S. Silva Wendell M.M.L. Novoa-Pabon Ana M. Silva Hélder M. Pinho Mario R. |
author_facet |
Santos Régis V.S. Silva Wendell M.M.L. Novoa-Pabon Ana M. Silva Hélder M. Pinho Mario R. |
author_sort |
Santos Régis V.S. |
title |
Long-term changes in the diversity, abundance and size composition of deep sea demersal teleosts from the Azores assessed through surveys and commercial landings |
title_short |
Long-term changes in the diversity, abundance and size composition of deep sea demersal teleosts from the Azores assessed through surveys and commercial landings |
title_full |
Long-term changes in the diversity, abundance and size composition of deep sea demersal teleosts from the Azores assessed through surveys and commercial landings |
title_fullStr |
Long-term changes in the diversity, abundance and size composition of deep sea demersal teleosts from the Azores assessed through surveys and commercial landings |
title_full_unstemmed |
Long-term changes in the diversity, abundance and size composition of deep sea demersal teleosts from the Azores assessed through surveys and commercial landings |
title_sort |
long-term changes in the diversity, abundance and size composition of deep sea demersal teleosts from the azores assessed through surveys and commercial landings |
publisher |
EDP Sciences |
publishDate |
2019 |
url |
https://doi.org/10.1051/alr/2019022 https://doaj.org/article/c6268c072eb24544ba453854600a4dcc |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Aquatic Living Resources, Vol 32, p 25 (2019) |
op_relation |
https://www.alr-journal.org/articles/alr/full_html/2019/01/alr190027/alr190027.html https://doaj.org/toc/1765-2952 1765-2952 doi:10.1051/alr/2019022 https://doaj.org/article/c6268c072eb24544ba453854600a4dcc |
op_doi |
https://doi.org/10.1051/alr/2019022 |
container_title |
Aquatic Living Resources |
container_volume |
32 |
container_start_page |
25 |
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1779317650866831360 |