Navegando por Autor "ANDRADE, Marcelo Costa"
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Item Acesso aberto (Open Access) Biometric relationships between body size and otolith size in 15 demersal marine fish species from the northern Brazilian coast(Instituto Nacional de Pesquisas da Amazônia, 2019-12) OLIVEIRA, Rory Romero de Sena; ANDRADE, Marcelo Costa; MACHADO, Fabiola Seabra; CUNHA, Élida Jesana Santana; FREITAS, Flaviane Souto de; KLAUTAU, Alex Garcia Cavalleiro de Macedo; GIARRIZZO, Tommaso; SAINT-PAUL, UlrichThe relationships between fish size and sagitta otolith measurements were calculated for the first time for 15 species belonging to six families from the northern Brazilian coast. A total of 220 fish were sampled from the bycatch landed by the bottom-trawl industrial shrimp-fishing fleet between August and September 2016. All species had strong relationships between otolith measurements and fish total length with the coefficient of determination (r 2) ranging between 0.71 and 0.99. The variable most strongly related to fish total length was found to be the sagittal otolith length (OL) with 98% of the variability. These relationships are a useful tool to estimate length and mass of preyed fish from otoliths found in stomach contents of marine predators.Item Acesso aberto (Open Access) Length-weight relationships and condition factor of the eaglebeak pacu Ossubtus xinguense Jégu, 1992 (Characiformes, Serrasalmidae), an endangered species from Rio Xingu rapids, northern Brazil(Universidade Federal do Pará, 2015-08) ANDRADE, Marcelo Costa; JESUS, Allan Jamesson Silva de; GIARRIZZO, TommasoThis study reports on the length-weight relationships and condition factor for the endangered rheophilic fish Ossubtus xinguense Jégu from Rio Xingu rapids. This species is threatened by construction of the third largest hydroelectric in the world, the Belo Monte dam close to the city of Altamira, northern Brazil. Specimens were collected in the dry season between July 2012 and September 2012. Male specimens have body length larger than females, atypical in serrasalmid fishes, and different length-weight relationships were found between adult and juvenile specimens. This study presents the first biological characteristics for O. xinguense.Item Acesso aberto (Open Access) Revisão taxonômica de Tometes Valenciennes, 1850 (Characiformes: Serrasalmidae) das drenagens do Escudo das Guianas(Universidade Federal do Pará, 2013-02-21) ANDRADE, Marcelo Costa; JÉGU, Michel Louis Arthur Marie Ange François; http://lattes.cnpq.br/1270768412397418; GIARRIZZO, Tommaso; http://lattes.cnpq.br/5889416127858884The genus Tometes Valenciennes, 1850 was originally described for the typespecies T. trilobatus, by presenting incisiform and bi- tricuspid teeth. However, the genus was synonymized with Myleus Müller and Troschell, 1844 for approximately a century and a half until being revalidated with an addition of two new species descriptions, T. lebaili and T. makue. This study presents a taxonomic review of Tometes from Guyana Shield where the three nominal species are recognized as valid and here were re-described, also a new species from Trombetas basin was described, increasing the diversity and distribution of genus. Among the main characteristics of diagnosis were observed: T. trilobatus is distinguishes from its congeners by having dentary and premaxillary teeth with the central cusp with rounded edge (vs. teeth with the central cusp or principal cusp with sharp edge). T. lebaili differs from others Tometes by having mouth oblique dorsally directed (vs. terminal mouth). T. makue is different by having a few spines on the serrae prepelvic, always between 0 and 9 spines (vs. over 9 spines). Already the new species is distinguished by the neurocranium with a slight concavity at the level of the epiphyseal bar, and also by having scales of irregular size (vs. dorsal profile of the neurocranium without a slight concavity, and scales of regular size). All species of Tometes are strictly rheophilic, and occur exclusively in the rapids of shield rivers, complex and fragile biotopes that are threatened by anthropogenic activities. The conclusions reached by this study highlight the urgent challenge to understand more fully existing species/habitat relationships.Item Acesso aberto (Open Access) Tometes camunani (Characiformes: Serrasalmidae), a new species of phytophagous fish from the Guiana Shield, rio Trombetas basin, Brazil(2013-06) ANDRADE, Marcelo Costa; GIARRIZZO, Tommaso; JÉGU, Michel Louis Arthur Marie Ange FrançoisA new species of Serrasalmidae, Tometes camunani, is described from the upper drainages of the rio Trombetas basin, Pará State, Brazil. The new species is distinguished from its congeners by having neurocranium with a slight concavity at the level of the frontal bone (vs. concavity absent, dorsal profile of neurocranium straight). It can be further distinguished from its congeners by having teeth with central cusp taller and acute (vs. central cusp shorter and with rounded edge in T. trilobatus), a terminal mouth (vs. upturned mouth in T. lebaili), and 12-26 prepelvic spines (vs. 0-9 in T. makue). The new species is strictly rheophilic like other species of Tometes, and occurs exclusively in the rapids of shield rivers, complex and fragile biotopes that are threatened by anthropogenic activities. An identification key to the species of the Myleus group is provided.