Browsing by Author "Menezes, Gui M."
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- Annotated list of fishes caught by the R/V ARQUIPÉLAGO off the Cape Verde archipelago.Publication . Menezes, Gui M.; Tariche, Oksana; Pinho, Mário Rui; Duarte, Pedro N.; Fernandes, Ana; Aboim, Maria A.A prospective survey was carried out in October - November of 2000, in the Cape Verde archipelago, by the R/V ARQUIPÉLAGO. The main objective was to determine the species composition and relative abundance of the demersal fish resources living in the waters of the Cape Verde archipelago. A list of fishes caught with bottom longline during the survey is presented in this document, along with information about the area, depth limits and the relative abundance of the species in the catches. Ninety-seven different species from 49 families were identified from 20 long-line sets. To our knowledge, the following 12 species were recorded for the first time from the waters of Cape Verde islands: Etmopterus princeps, Etmopterus pusillus, Gymnothorax maderensis, Myroconger compressus, Laemonema robustum, Beryx splendens, Scorpaena elongata, Serranus atricauda, Taractes rubescens, Taracthichthys longipinnis, Pagrus africanus and Cathidermis sufflamen. The species Laemonema robustum, were new to the CLOFETA area.
- Diets of forkbeard (Phycis phycis) and conger eel (Conger conger) off the Azores during spring of 1996 and 1997Publication . Morato, Telmo; Solà, Encarnacion; Grós, Maria P.; Menezes, Gui M.The forkbeard, Phycis phycis, and conger eel, Conger conger, are two coastal species, with a wide bathymetric and geographical distribution. The longline fleet of the Azores catches these two important commercial species. Few studies on their diet composition were found in literature. Data were collected during the demersal cruise surveys that took place aboard the R/V “Arquipélago” during the spring of 1996 and 1997. Stomachs of 53 forkbeards and 95 conger eels were examined to define their diets. Both species fed primarily on fishes, mainly on two benthopelagic species (Capros aper and Macroramphosus scolopax). However, the relative importance of fish was higher for conger eel than for forkbeard, which fed secondarily on decapods. Prey composition of the diet did not vary between sexes, predator size or areas. However, some differences were found on diet composition between depth strata. Prey composition indicates that both predators have the ability to feed near the bottom on benthic prey or in the water column on benthopelagic species.
- First record of the spined pygmy shark, Squaliolus laticaudus (Smith & Radcliffe, 1912) in the Azores, extending its distribution in the North-eastern AtlanticPublication . Silva, Alexandre A.; Duarte, Pedro C.; Giga, Ana; Menezes, Gui M.A presente nota documenta a primeira observação do tubarão-anão, Squaliolus laticaudus (Smith & Radcliffe, 1912), nos Açores, estendendo a sua distribuição ocidental no Atlântico Nordeste até ao arquipélago. A ocorrência da espécie nos arquipélagos macaronésicos é igualmente discutida.
- Fishes of the Northern Mid-Atlantic Ridge collected during the MAR-ECO cruise in June-July 2004 : An Annotated ChecklistPublication . Porteiro, Filipe M. A.; Sutton, Tracey; Byrkjedal, Ingvar; Orlov, Alexy M.; Heino, Mikko; Menezes, Gui M.; Bergstad, Odd AkselRecords of the fishes from the northern Mid-Atlantic Ridge (MAR) (41⁰N - 60⁰N) sampled during two research cruises conducted in summer 2004 on the R/V G.O. Sars and M/S Loran are presented. The cruises were major sampling efforts carried out for the MAR-ECO project, i.e. the Census of Marine Life field project entitled “Patterns and Processes of the Ecosystems of the Northern Mid-Atlantic”. The investigation included sampling with several midwater nets, bottom trawl and longlines from surface waters to about 4000 m. The list comprises around 300 species of fishes from 82 families. Many records were new to the northern mid- Atlantic area, and the list also comprises three recently described species and some additional specimens to date only identified to genus.
- Movements of a pelagic-phase wreckfish, Polyprion americanus (Schneider, 1801), as indicated by tag and recapturePublication . Sedberry, George R.; Carlin, Joel L.; Menezes, Gui M.Vários chernes juvenis, Polyprion americanus (Schneider. 1801) foram capturados à superfície da água e marcados em vários locais próximos das ilhas do Grupo Central dos Açores. Um dos exemplares foi recapturado 3 meses depois ter sido marcado, a 217 km do local onde tinha sido libertado e a uma profundidade de 254 m. A recaptura deste espécime indica que o cherne passa para uma vida demersal quando atinge um comprimento total de cerca de 50 cm.
- Staining techniques for ageing tope shark, Galeorhinus galeus (Linnaeus, 1758), from the Azores : a comparison based on precision analysis.Publication . Duarte, Pedro N.; Silva, Alexandre A.; Menezes, Gui M.; Pinho, Mário RuiA vertebrae sample of tope shark, Galeorhinus galeus (Linnaeus, 1758), stratified by sizeclasses,was used to test between different staining techniques of enhancing vertebral growth ring visibility. Four techniques were tested: alizarin red, silver nitrate and cobalt nitrate staining, and the “deep-coned vertebrae” technique. The latter was discarded due to its unsuitability for tope shark vertebrae. The cobalt nitrate original protocol was modified. Upon staining, each vertebra was subject to three replicated independent readings, by a single reader. Within-reader consistency and bias of growth ring counts determination were evaluated using four different precision indices: percent of agreement (PA), average percent error (APE), coefficient of variation (V) and index of precision (D). Results indicated that the vertebrae stained with the cobalt nitrate technique showed both better optic enhancement of growth rings and higher degree of count consistency, comparatively to the alizarin red and silver stained vertebrae. Conclusively, the cobalt nitrate was the most efficient staining technique upon tope shark vertebrae, among the methods tested herein.
- Umbraculum mediterraneum (Lamarck, 1819)(Mollusca: Opistobranchia, Umbraculomorpha), a new record for the littoral fauna of the AzoresPublication . Menezes, Gui M.A ocorrência de Umbraculum mediterraneum (Lamarck, 1819) é registada pela primeira vez para os Açores, baseada em dois espécimes capturados na ilha do Faial e na ilha de S. Miguel.