Catch and bycatch in the tangle net fishery for crayfish (Palinurus elephas) off the south west coast of Ireland
Crayfish or spiny lobster is fished off the south west coast of Ireland. There are also smaller fisheries on the west and north west coasts. Although historically, prior to the 1970s, the main fishing gear used in the fishery was top entrance traps crayfish are now targeted with large mesh tangle ne...
Main Authors: | , |
---|---|
Format: | Report |
Language: | English |
Published: |
Marine Institute
2022
|
Subjects: | |
Online Access: | http://hdl.handle.net/10793/1810 |
id |
ftmarineinst:oai:oar.marine.ie:10793/1810 |
---|---|
record_format |
openpolar |
spelling |
ftmarineinst:oai:oar.marine.ie:10793/1810 2023-05-15T15:56:11+02:00 Catch and bycatch in the tangle net fishery for crayfish (Palinurus elephas) off the south west coast of Ireland Tully, Oliver Palma-Pedraza, S. 2022 http://hdl.handle.net/10793/1810 en eng Marine Institute EMFF 2014-2020 Marine Institute Report Series; Tully, O. and Palma-Pedraza, S. (2022). Catch and bycatch in the tangle net fishery for crayfish (Palinurus elephas) off the south west coast of Ireland. EMFF 2014-2020 Marine Institute Report Series, Marine Institute http://hdl.handle.net/10793/1810 Crayfish bycatch tangle net Technical Report 2022 ftmarineinst 2023-01-19T23:58:39Z Crayfish or spiny lobster is fished off the south west coast of Ireland. There are also smaller fisheries on the west and north west coasts. Although historically, prior to the 1970s, the main fishing gear used in the fishery was top entrance traps crayfish are now targeted with large mesh tangle nets. The selectivity of these nets is poor and there is known to be a by-catch of finfish, skates and rays and protected species such as grey seal. The fishery usually occurs from mid-March to December. The species composition and size distribution of the catch and by-catch was surveyed over a 4 year period from 2017-2020 from Dingle Bay north to the Shannon Estuary. Additional data south of this area was obtained in 2020. A crayfish tagging programme was undertaken in 2017 and 2018. Between 2 and 6 vessels participated in the programme depending on year Most of the data was reported directly by Skippers and crew who were contracted to supply data. Scientific observers covered a proportion of trips in 2017 and 2019. A total of 1500 nmiles of tangle net hauls were surveyed across 6 vessels. A total of 11792 crayfish and 899 lobsters were measured, 1234 crayfish were tagged and released and 45 recaptures were reported. Spider crab, brown crab and crayfish were the numerically dominant species in the catch. Lobster, pollack, thornback ray, spurdog, monkfish and turbot were caught regularly in low numbers. There was no cetacean by-catch. A total of 200 grey seals were caught over the 4 year period by the vessels participating in the survey. Endangered and critically endangered species, including flapper skate, common skate, angel shark and white skate, were caught in very low numbers. The finfish catch is mainly lost to scavengers or seal depredation before nets are retrieved and because of long soak times which averaged 8 days. This reduces the value of the catch. The average value of the live crustacean (crayfish, lobster, brown crab) catch was approximately €300 per mile of net hauled. Crayfish were tagged and released ... Report Common skate Turbot Marine Institute Open Access Repository Dingle ENVELOPE(78.066,78.066,-68.567,-68.567) |
institution |
Open Polar |
collection |
Marine Institute Open Access Repository |
op_collection_id |
ftmarineinst |
language |
English |
topic |
Crayfish bycatch tangle net |
spellingShingle |
Crayfish bycatch tangle net Tully, Oliver Palma-Pedraza, S. Catch and bycatch in the tangle net fishery for crayfish (Palinurus elephas) off the south west coast of Ireland |
topic_facet |
Crayfish bycatch tangle net |
description |
Crayfish or spiny lobster is fished off the south west coast of Ireland. There are also smaller fisheries on the west and north west coasts. Although historically, prior to the 1970s, the main fishing gear used in the fishery was top entrance traps crayfish are now targeted with large mesh tangle nets. The selectivity of these nets is poor and there is known to be a by-catch of finfish, skates and rays and protected species such as grey seal. The fishery usually occurs from mid-March to December. The species composition and size distribution of the catch and by-catch was surveyed over a 4 year period from 2017-2020 from Dingle Bay north to the Shannon Estuary. Additional data south of this area was obtained in 2020. A crayfish tagging programme was undertaken in 2017 and 2018. Between 2 and 6 vessels participated in the programme depending on year Most of the data was reported directly by Skippers and crew who were contracted to supply data. Scientific observers covered a proportion of trips in 2017 and 2019. A total of 1500 nmiles of tangle net hauls were surveyed across 6 vessels. A total of 11792 crayfish and 899 lobsters were measured, 1234 crayfish were tagged and released and 45 recaptures were reported. Spider crab, brown crab and crayfish were the numerically dominant species in the catch. Lobster, pollack, thornback ray, spurdog, monkfish and turbot were caught regularly in low numbers. There was no cetacean by-catch. A total of 200 grey seals were caught over the 4 year period by the vessels participating in the survey. Endangered and critically endangered species, including flapper skate, common skate, angel shark and white skate, were caught in very low numbers. The finfish catch is mainly lost to scavengers or seal depredation before nets are retrieved and because of long soak times which averaged 8 days. This reduces the value of the catch. The average value of the live crustacean (crayfish, lobster, brown crab) catch was approximately €300 per mile of net hauled. Crayfish were tagged and released ... |
format |
Report |
author |
Tully, Oliver Palma-Pedraza, S. |
author_facet |
Tully, Oliver Palma-Pedraza, S. |
author_sort |
Tully, Oliver |
title |
Catch and bycatch in the tangle net fishery for crayfish (Palinurus elephas) off the south west coast of Ireland |
title_short |
Catch and bycatch in the tangle net fishery for crayfish (Palinurus elephas) off the south west coast of Ireland |
title_full |
Catch and bycatch in the tangle net fishery for crayfish (Palinurus elephas) off the south west coast of Ireland |
title_fullStr |
Catch and bycatch in the tangle net fishery for crayfish (Palinurus elephas) off the south west coast of Ireland |
title_full_unstemmed |
Catch and bycatch in the tangle net fishery for crayfish (Palinurus elephas) off the south west coast of Ireland |
title_sort |
catch and bycatch in the tangle net fishery for crayfish (palinurus elephas) off the south west coast of ireland |
publisher |
Marine Institute |
publishDate |
2022 |
url |
http://hdl.handle.net/10793/1810 |
long_lat |
ENVELOPE(78.066,78.066,-68.567,-68.567) |
geographic |
Dingle |
geographic_facet |
Dingle |
genre |
Common skate Turbot |
genre_facet |
Common skate Turbot |
op_relation |
EMFF 2014-2020 Marine Institute Report Series; Tully, O. and Palma-Pedraza, S. (2022). Catch and bycatch in the tangle net fishery for crayfish (Palinurus elephas) off the south west coast of Ireland. EMFF 2014-2020 Marine Institute Report Series, Marine Institute http://hdl.handle.net/10793/1810 |
_version_ |
1766391649612595200 |