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Chemical communication of handling stress in fish
(Pergamon-Elsevier B.V. Ltd, 2011-06-01)
We investigated whether juveniles of the nocturnal fish jundia (Rhamdia quelen) and the diurnal fish Nile tilapia (Oreochromis niloticus) are able to chemically communicate stress to conspecifics. Groups of 8 fish were ...
Insights into the concept of fish welfare
(Inter-research, 2007-05-04)
Fish welfare issues are predicated on understanding whether fish are sentient beings. Therefore, we analyzed the logic of the methodologies used for studying this attribute. We conclude that empirical science is unable to ...
River fisheries in Brazil: a review
(1989-01-01)
Riverine fisheries in Brazil are reviewed. There is a broad description of the environment and the fish, and arguments for the high diversity of fish fauna diversity are examined. The country is divided into five large ...
The dietary regime of detritivorous fish from the River Jacaré Pepira, Brazil
(1999-04-01)
The diet of detritivorous fish was analysed at four distinct habitats in a tropical river during the wet and dry seasons. Two methodologies were used to determine the diet of the fish: (1) the direct analysis of the stomach ...
A standard protocol for obtaining fish chromosomes under post-mortem conditions
(Elsevier B.V., 2007-01-01)
In order to improve cytogenetical analyses on fish, especially focusing on delicate and rare species, we have adopted a new in vitro methodology using dead animals. The results obtained from 24 neotropical freshwater and ...
Morphologically differentiated sex chromosomes in neotropical freshwater fish
(2001-12-01)
A general survey of the occurrence of morphologically differentiated sex chromosomes in the neotropical freshwater fishes is presented. The total number of 32 occurrences involving simple XX-XY and ZZ-ZW, and multiple ...
Interference of cage fish farm on diet, condition factor and numeric abundance on wild fish in a Neotropical reservoir
(2013-11-15)
Historically, the ichthyofauna of large Brazilian rivers has been subject to anthropogenic interference, such as impoundments. Currently, cage fish farming systems are a new source of impact on aquatic ecosystems. The ...
The goatfish Pseudupeneus maculatus and its follower fishes at an oceanic island in the tropical west Atlantic
(Blackwell Publishing, 2006-09-01)
The influence of a substratum-disturbing forager, the spotted goatfish Pseudupeneus maculatus on the assemblage of its escorting, opportunistic-feeding fishes was examined at Fernando de Noronha Archipelago (tropical west ...
Spatial and temporal distribution of fishing resources exploited by the Manaus fishing fleet, Amazonas, Brazil
(Instituto Internacional de Ecologia, 2007-11-01)
Recursos pesqueiros são importantes fontes de renda e alimento para as populações rurais e urbanas na Amazônia. O presente trabalho avalia a pesca e as variáveis ambientais que determinam a produção de pescarias que ...