An Atlantic journey: The distribution and fishing pattern of the Madeira deep sea fishery

Delgado, J. M. P. Q.; Amorim, Antonieta; Gouveia, Lídia; Gouveia, Nuno

doi:10.1016/j.rsma.2018.05.001

Cited by 9 publications

(9 citation statements)

References 8 publications

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“…In March 2009 an experimental fishing survey was carried out off the Canary Islands between 800 and 1200 m depth using black scabbardfish midwater drifting longlines of the Madeiran type. This fishing gear has 5000 hooks (type 6) (Martins and Ferreira 1995) and is usually set well above the bottom in the water column between 700 and 1300 m depth, without contacting the seafloor (Delgado et al 2018). Fishing operations were carried out by two Madeiran profes-sional vessels, F/V Pico Dourado and F/V Pico Alto, with scientific observers on board.…”

Section: Methodsmentioning

confidence: 99%

“…The deep-sea fishery of the bathypelagic black scabbardfishes, Aphanopus carbo and A. intermedius, has a long tradition off the Portuguese mainland and around the Madeira archipelago, representing one of the world's longest standing exploitations of meso-and bathypelagic fishes (Delgado et al 2013(Delgado et al , 2018. Off Madeira this fishery is performed with midwater drifting longlines set between 800 and 1200 m depth over the continental slope and nearby seamounts.…”

Section: Introductionmentioning

confidence: 99%

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Deep-sea sharks as by-catch of an experimental fishing survey for black scabbardfishes (<em>Aphanopus spp.</em>) off the Canary Islands (NE Atlantic)

et al. 2018

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The deep-sea sharks associated as by-catch of the Madeiran midwater drifting longline fishery for scabbardfishes (Aphanopus spp.) were investigated by means of an experimental survey at 800-1200 m depth within the Canary Islands Exclusive Economic Zone, whose fishing grounds have been exploited during the past 15 years. Nine species of chondrichthyans were identified, belonging to five families: Pseudotriakidae, Centrophoridae, Etmopteridae, Somniosidae and Chimaeridae. Data on length, weight and sex ratio for the 436 chondrichthyan individuals caught in the March 2009 survey are given. Several voucher specimens of each species caught were deposited in the collections of the Natural History Museum of Funchal.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deep-sea sharks as by-catch of an experimental fishing survey for black scabbardfishes (<em>Aphanopus spp.</em>) off the Canary Islands (NE Atlantic)

et al. 2018

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“…Data on the ecology and temporal fluctuations of pelagic species in areas such as the oceanic region around the Madeira and Canary archipelagos, off NW Africa, are still very limited. Here, there have been some attempts to study the composition, abundance and distribution of pelagic and demersal species with the help of research or fishing vessels (Christiansen et al, 2009;Delgado et al, 2018;Fock et al, 2002b). However, these studies were mostly species-directed and few presented a multi-specific approach.…”

Section: Introductionmentioning

confidence: 99%

Seabird diet analysis suggests sudden shift in the pelagic communities of the subtropical Northeast Atlantic

Romero

Catry

Alonso³

et al. 2021

Marine Environmental Research

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The dynamics of the subtropical pelagic ecosystems of the Northeast Atlantic are still poorly known due to the high costs associated with sampling large oceanic areas. Top predators can be used as alternative low-cost samplers and indicators of the temporal variability of such systems. To study the variation in the composition of pelagic species through time in the broad Canary current region, we analysed foraging trips and regurgitations of Cory's shearwaters Calonectris borealis nesting on Selvagens islands, in 2008-2011 and 2016-2018. Fisheries data, oceanographic variables and the North Atlantic Oscillation were explored as possible explanatory variables for trends in behaviour and diet. Cory's shearwaters' diet, complemented by fisheries data, revealed marked changes in the composition of the pelagic fish communities. In 2016 there was a peak in the abundance of the Atlantic chub mackerel Scomber colias, followed by an explosive increase in the abundance of the Longspine snipefish Macroramphosus scolopax in 2017 and 2018, as deduced from the diet composition of the Cory's shearwater, and supported by fisheries data, in the broad oceanic area surrounding the Selvagens islands. Oceanographic variables did not show fluctuations correlated with these marked shifts in pelagic fish availability, the causes of which remain largely unknown. This study highlights the importance of the Atlantic chub mackerel and of the Longspine snipefish in the Madeira/Canary region and exemplifies the efficiency of avian predators in revealing rapid changes in pelagic communities of oceanic domains. Such trends and variations need to be better monitored and understood to measure the impact of ongoing global changes and to sustainably manage the marine environment and resources.

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“…In Madeira, exploited deep fish stocks are overwhelmingly dominated by two scabbardfish species, Aphanopus carbo Lowe, 1839 andA. intermedius Parin, 1983 that represent about half of the overall landings throughout the year (Delgado et al 2013;6 Hermida and Delgado 2016;Shon et al 2016;Delgado et al 2018). In 2017 combined landings of these two species were 2 162 tons representing a value of 7.6 M€ (Regional Fisheries Department, DRP).…”

Section: Introductionmentioning

confidence: 99%

“…In 2017 combined landings of these two species were 2 162 tons representing a value of 7.6 M€ (Regional Fisheries Department, DRP). The local fishing methodology uses a drifting longline set above the bottom, targeting the depth range between 800 to 1,300 meters deep (Delgado 2018). This drifting longline is deployed to target the diel feeding migration to midwater made by these benthopelagic species in the water column (Parin 1986).…”

Section: Introductionmentioning

confidence: 99%

Two sympatric, not externally discernible, and heavily exploited deepwater species with coastal migration during spawning season: implications for sustainable stocks management of Aphanopus carbo and Aphanopus intermedius around Madeira

Vasconcelos

Sousa

Henriques

et al. 2020

Can. J. Fish. Aquat. Sci.

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Several artisanal fisheries target deepwater species. These stocks are highly sensitive to overfishing because of their slow growth and late maturation. This vulnerability is higher if species concentrate during spawning season in coastal areas, as occur with scabbardfish (Aphanopus spp.). In this paper, we explore if two Aphanopus species (A. carbo and A. intermedius) that coexist show migration patterns to coastal areas during spawning. We analysed specimens of both species throughout 4 years (2014–2017) in a weekly basis and compare morphological parameters with the distance of the coast (coastal (<12 n.m.; 1 n.m. = 1.852 km) versus offshore (>12 n.m.)). Both species showed coastal patterns of migration during the spawning season (October–December), with 65.90% of total specimens of A. carbo and 51.60% of A. intermedius being caught at <12 n.m. during this season. Fishing events were also more numerous at <12 n.m. to the coast during spawning season (46.6%) relative to nonspawning season (32.6%). A series of management measures (e.g., October–December season) were developed to preserve Aphanopus stocks in the Northeast Atlantic Ocean.

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An Atlantic journey: The distribution and fishing pattern of the Madeira deep sea fishery

Cited by 9 publications

References 8 publications

Deep-sea sharks as by-catch of an experimental fishing survey for black scabbardfishes (<em>Aphanopus spp.</em>) off the Canary Islands (NE Atlantic)

Deep-sea sharks as by-catch of an experimental fishing survey for black scabbardfishes (<em>Aphanopus spp.</em>) off the Canary Islands (NE Atlantic)

Seabird diet analysis suggests sudden shift in the pelagic communities of the subtropical Northeast Atlantic

Two sympatric, not externally discernible, and heavily exploited deepwater species with coastal migration during spawning season: implications for sustainable stocks management of Aphanopus carbo and Aphanopus intermedius around Madeira

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