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Company R.,University of Algarve | Felicia H.,University of Algarve | Serafim A.,University of Algarve | Almeida A.J.,University of Lisbon | And 2 more authors.
Deep-Sea Research Part I: Oceanographic Research Papers | Year: 2010

The knowledge of metal contamination in deep-sea fishes living in the surroundings of hydrothermal vents is very scarce, along with the detoxification mechanisms that allow them to live near one of the most metal contaminated marine environments. Six deep-sea fish species, although not vent endemic were collected near three Mid-Atlantic Ridge (MAR) hydrothermal vents (Menez Gwen, Lucky Strike and Rainbow) and the gills, muscle and liver were selected for this study due to their importance in metal metabolism and storage. The concentrations of seven metals (Ag, Cd, Cr, Cu, Fe, Mn, and Ni) and a metal-related biomarker (metallothionein-like proteins-MTL) were assessed. Major differences in metal accumulation among fish species are related to their feeding habits and vent site of their capture. The liver and gills are in general the most important tissues for metal accumulation compared to the muscle, but tissue partitioning is very dependent on the fish species considered. Compared to other deep-sea fishes, fish capture in the vicinity of hydrothermal vents accumulates higher amounts of metals in general. However, MTL levels are not considerably different from what is found in commercial coastal fishes, and is poorly correlated with metal concentrations in the tissues. Therefore, MTL may not constitute one major detoxification system for deep-sea species living in the vicinity of three important MAR vent sites. © 2010 Elsevier Ltd. Source


Biscoito M.,Museu Municipal do Funchal Historia Natural | Delgado J.,Direccao de Servicos de Investigacao das Pescas | Gonzalez J.A.,Instituto Canario Of Ciencias Marinas | Stefanni S.,University of The Azores | And 4 more authors.
Cybium | Year: 2011

The black scabbardfish has been subjected to a commercial fishery in the waters of the archipelago of Madeira for more than 150 years, which is probably the oldest deep-sea commercial fishery in the world. Over this period the presence of two sympatric species (Aphanopus carbo Lowe, 1839 and A. intermedius Parin, 1983) in the area has been ignored, mainly due to the difficulty in separating the two species using external morphological characters. The need for a more accurate management of this highly important resource, reinforced by an emergent fishery in Portugal mainland and elsewhere in the North Atlantic, justified a new effort for morphological characterization of the two species, based on the largest genetically validated sample obtained to date. The results presented in this paper demonstrate that it is possible to discriminate the two species on the bases of meristic and morphometric data using discriminant analysis. The outcome of this analysis is supported by the genetic identification based on CR and COI sequences.addition, a redescription of A. intermedius incorporating the new character ranges found is presented. Source


Almeida A.J.,University of Lisbon | Biscoito M.,Museu Municipal do Funchal Historia Natural | Santana J.I.,Instituto Canario Of Ciencias Marinas | Gonzalez J.A.,Instituto Canario Of Ciencias Marinas
Acta Ichthyologica et Piscatoria | Year: 2010

Following a series of surveys with bottom longlines and fish traps along the island slopes off the archipelagos of Madeira, Canaries and Cape Verde, and with bottom trawls along the coast of Morocco and Western Sahara between 2004 and 2006 many specimens of Synaphobranchus were caught, revealing the presence of two species. Based on these specimens and Museum preserved specimens from this area grey cutthroat, Synaphobranchus affinis Güther, 1877, is recorded for the first time from off Portugal, Madeira archipelago, Great Meteor Seamount, Canary Islands, Morocco, Western Sahara, Cape Verde Islands, and Senegal. It is confirmed that S. kaupii is also conspecific in this area. Meristic and morphometric data of the specimens studied are also presented. Source


Freitas M.,Estacao de Biologia Marinha do Funchal | Almeida A.J.,University of Lisbon | Delgado J.,Direccao de Servicos de Investigacao das Pescas | Gonzalez J.A.,Instituto Canario Of Ciencias Marinas | And 2 more authors.
Acta Ichthyologica et Piscatoria | Year: 2011

The smalleyed rabbitfish, Hydrolagus affinis (de Brito Capello, 1868) (Chimaeridae), is recorded from the archipelago of Madeira for the first time, based on seven specimens caught between 1200 and 2500 m depth. This record extends the previously known range of distribution of this species, and also confirms its vertical distribution down to 2500 m. Additional material collected from the Canary Islands and the Azores was used for comparison. Source

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