First record of hyperostosis in channel scabbardfish Evoxymetopon taeniatus Gill, 1863: An mesopelagic migratory fish.

The majority of records of hyperostosis in the literature are from highly active tropical species found in shallow waters, with information about hyperostotic deep-sea fish being scarce. This study describes the occurrence of hyperostosis, a skeletal anomaly, in two specimens of channel scabbardfish Evoxymetopon taeniatus Gill, 1863, obtained from two different regions in Rio de Janeiro, Southeast Brazil. Through radiographic image analysis, the presence of hyperostosis was observed in two distinct bone regions: dorsal pterygiophores (DPT) and anal pterygiophores (APT), affecting a significant number of bones: DPT-83 of 87 (95.

Description and Patterns of Hyperostosis in Plata Pompano, Trachinotus marginatus Cuvier, 1832.

This study describes the occurrence of hyperostosis, to the best of our knowledge, for the first time in Trachinotus marginatus Cuvier 1832 and examines its patterns in 21 specimens from Rio de Janeiro, Brazil. Radiographic images revealed the presence of the condition in 76.2% of the individuals, affecting five distinct bone regions: supraoccipital (76.

Evidence of metabolic microevolution of the limpet Nacella concinna to naturally high heavy metal levels in Antarctica.

The gastropod Nacella concinna is the most conspicuous macroinvertebrate of the intertidal zone of the Antarctic Peninsula and adjacent islands. Naturally high levels of copper and cadmium in coastal marine ecosystems are accumulated in N. concinna tissues.

Metabolic responses of the Antarctic fishes Notothenia rossii and Notothenia coriiceps to sewage pollution.

The present study aimed to assess the sewage effects of the Brazilian Antarctic Station Comandante Ferraz, Admiralty Bay, King George Island, on the hepatic metabolism (energetic, antioxidant, and arginase levels) and levels of plasma constituents of two Antarctic fish species Notothenia rossii and N. coriiceps. The bioassays were conducted under controlled temperature (0 °C) and salinity (35 psu), exposing the fish for 96 h, to sewage effluent diluted in seawater to 0.

Taxonomy of Cotylea (Platyhelminthes: Polycladida) from Cabo Frio, southeastern Brazil, with the description of a new species.

Polyclads are free-living Platyhelminthes with a simple, dorsoventrally flattened body and a much ramified intestine. In Brazil, 66 species are reported; only three from Rio de Janeiro State (RJ). The main objective of this study is to describe and illustrate coloration pattern, external morphology, reproductive system morphology and, when possible, biological and ecological aspects of species of the suborder Cotylea found in Cabo Frio, RJ.