Towards the Reduction of Trawl-Induced Sediment Resuspension and Seabed Impact through Self-Regulated Deep-Sea Fishery Management in la Fonera Canyon (NW Mediterranean)

Palanques, Albert; Puig, Pere; Arjona, Marta

Towards the Reduction of Trawl-Induced Sediment Resuspension and Seabed Impact through Self-Regulated Deep-Sea Fishery Management in la Fonera Canyon (NW Mediterranean)

4th International Submarine Canyon Symposium (INCISE2018), 5-7 November 2018, Shenzhen, China

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Bibliographic Details
Main Authors:	Palanques, Albert, Puig, Pere, Arjona, Marta
Format:	póster de congreso biblioteca
Language:	English
Published:	2018-11-05
Subjects:	Submarine canyon, Trawling impact, Sediment resuspension, Otter boards,
Online Access:	http://hdl.handle.net/10261/186393
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id	dig-icm-es-10261-186393
record_format	koha
spelling	dig-icm-es-10261-1863932019-11-07T13:50:35Z Towards the Reduction of Trawl-Induced Sediment Resuspension and Seabed Impact through Self-Regulated Deep-Sea Fishery Management in la Fonera Canyon (NW Mediterranean) Palanques, Albert Puig, Pere Arjona, Marta Submarine canyon Trawling impact Sediment resuspension Otter boards 4th International Submarine Canyon Symposium (INCISE2018), 5-7 November 2018, Shenzhen, China Bottom trawling has been identified as the main human activity causing physical loss of -and damage to- the seafloor. Studies in the La Fonera Canyon have shown that the recurrent reworking of the deep seafloor by trawling gears creates periodic resuspension events, causes sediment removal from fishing grounds and ultimately smooths the seabed morphology over large spatial scales. Recently, there has been a tendency in the fishing sector to shift towards gears with less impact on the surface sediments. In this regard, the fishermen guild of the Palamós harbor initiated in 2013 a self-regulated project with the main goal to reduce the intensive erosion created by trawling gears on fishing grounds along La Fonera Canyon flanks. Six different types of otter boards were selected to monitor their impact on the sea floor. The fishing ground was closed to the fleet during the monitoring period and it was only visited by a single trawling vessel using different otter boards on consecutive days. Previously, a mooring line equipped with a downward looking ADCP and 3 turbidimeters was deployed on the northern flank of the submarine canyon at 980 m water depth, slightly deeper than the maximum trawling depth. Data was used to select the otter boards that performed better and resuspended less amount of sediment. The passage of the heavier otter boards that were in contact with the seafloor generated sharp increases in suspended sediment concentration (up to 900 mg/l at 5 m above seafloor) and the consequent intensification of the current speed closer to the seafloor that denoted the occurrence of sediment gravity flows. On the contrary, the hauls with the nets equipped with pelagic and light (< 500 kg) semi-pelagic and bottom otter boards did not produce any significant increase of the suspended sediment concentration and current speed, which indicated that even they could be in contact with the sea floor, did not cause any noticeable resuspension. These otter board models were selected to be used in all the trawling vessels working at these fishing grounds, and the complete change of trawling gear in the Palamós fleet was accomplished on September 2017 Peer reviewed 2019-07-19T07:19:53Z 2019-07-19T07:19:53Z 2018-11-05 póster de congreso http://purl.org/coar/resource_type/c_6670 4th International Submarine Canyon Symposium (2018) http://hdl.handle.net/10261/186393 en Sí none
institution	ICM ES
collection	DSpace
country	España
countrycode	ES
component	Bibliográfico
access	En linea
databasecode	dig-icm-es
tag	biblioteca
region	Europa del Sur
libraryname	Biblioteca del ICM España
language	English
topic	Submarine canyon Trawling impact Sediment resuspension Otter boards Submarine canyon Trawling impact Sediment resuspension Otter boards
spellingShingle	Submarine canyon Trawling impact Sediment resuspension Otter boards Submarine canyon Trawling impact Sediment resuspension Otter boards Palanques, Albert Puig, Pere Arjona, Marta Towards the Reduction of Trawl-Induced Sediment Resuspension and Seabed Impact through Self-Regulated Deep-Sea Fishery Management in la Fonera Canyon (NW Mediterranean)
description	4th International Submarine Canyon Symposium (INCISE2018), 5-7 November 2018, Shenzhen, China
format	póster de congreso
topic_facet	Submarine canyon Trawling impact Sediment resuspension Otter boards
author	Palanques, Albert Puig, Pere Arjona, Marta
author_facet	Palanques, Albert Puig, Pere Arjona, Marta
author_sort	Palanques, Albert
title	Towards the Reduction of Trawl-Induced Sediment Resuspension and Seabed Impact through Self-Regulated Deep-Sea Fishery Management in la Fonera Canyon (NW Mediterranean)
title_short	Towards the Reduction of Trawl-Induced Sediment Resuspension and Seabed Impact through Self-Regulated Deep-Sea Fishery Management in la Fonera Canyon (NW Mediterranean)
title_full	Towards the Reduction of Trawl-Induced Sediment Resuspension and Seabed Impact through Self-Regulated Deep-Sea Fishery Management in la Fonera Canyon (NW Mediterranean)
title_fullStr	Towards the Reduction of Trawl-Induced Sediment Resuspension and Seabed Impact through Self-Regulated Deep-Sea Fishery Management in la Fonera Canyon (NW Mediterranean)
title_full_unstemmed	Towards the Reduction of Trawl-Induced Sediment Resuspension and Seabed Impact through Self-Regulated Deep-Sea Fishery Management in la Fonera Canyon (NW Mediterranean)
title_sort	towards the reduction of trawl-induced sediment resuspension and seabed impact through self-regulated deep-sea fishery management in la fonera canyon (nw mediterranean)
publishDate	2018-11-05
url	http://hdl.handle.net/10261/186393
work_keys_str_mv	AT palanquesalbert towardsthereductionoftrawlinducedsedimentresuspensionandseabedimpactthroughselfregulateddeepseafisherymanagementinlafoneracanyonnwmediterranean AT puigpere towardsthereductionoftrawlinducedsedimentresuspensionandseabedimpactthroughselfregulateddeepseafisherymanagementinlafoneracanyonnwmediterranean AT arjonamarta towardsthereductionoftrawlinducedsedimentresuspensionandseabedimpactthroughselfregulateddeepseafisherymanagementinlafoneracanyonnwmediterranean
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Towards the Reduction of Trawl-Induced Sediment Resuspension and Seabed Impact through Self-Regulated Deep-Sea Fishery Management in la Fonera Canyon (NW Mediterranean)

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