The effects of aqueous extracts from a cyanobacteria species, Anabaena spiroides, on fish (Odontesthes argentinensis), crab (Callinectes sapidus), and purified eel acetylcholinesterase (AChE) activity were studied. In vitro ...

A produção brasileira de camarões vem apresentando um crescimento significativo nos últimos anos, concentrando-se na região nordeste, principal pólo produtor do país. Muito embora as condições climáticas da região Sul ...

O nitrato não é considerado tóxico para os organismos aquáticos cultivados com renovação de água, entretanto, em sistemas de cultivo fechados, este composto pode atingir altas concentrações,tornando-se potencialmente tóxico ...

O cultivo de camarões marinhos, apesar do seu franco desenvolvimento, vem sendo criticado por seus impactos ambientais ao meio ambiente aquático como a liberação excessiva de nutrientes e a eutrofização de ecossistemas ...

Biological degradation of cyanobacterial hepatotoxin microcystins in estuarine and coastal water samples from the Patos Lagoon estuarine system, a coastal lagoon situated at the southernmost region of Brazil, was observed. ...

Since the early 1930's, beach profiles have been broadly classified in one of the two types: storm profiles or swell profiles associated, respectively, with steep or low waves. Changes in beach profiles involves so many ...

Climate change caused by human action can be considered a major challenge facing human kind in the 21st century. Its potential to cause economic and social impacts is considerable, as it directly affects standards of living ...

A água é susceptível de alteração de suas propriedades e constituição por agentes naturais e antrópicos (sociais e tecnológicos). Essas alterações, quando intensas, podem provocar poluição. Em todo ambiente hídrico, as ...

The distribution, the specific and total density, and total biomass of the cladocera which were collected during the ECOSAR II cruise (prospect and evaluation of sardine biomassa on brazilian southeast coast through ...

Antifouling agentshave been used on vessels and boats since ancient civilizations. Thus, a brief history on the three generations of antifouling paints was provided in the present review. Additionally, information about ...

This study was undertaken to evaluate temporal trends of litter contamination at Cassino beach, Southern Brazil. Surveys were conducted between 1994 and 1995, and then resumed from 2003 to 2006. Litter composition was ...

This research examines the characteristics of Lake Guaíba’s waves with regard to their main parameters; significant wave height (Hs), period (T), direction of wave propagation and its connections with the ressuspension ...

A porção inferior da Laguna dos Patos, um estuário micromaré é caracterizda por eventos de enchente e vazante regidos respectivamente por marés meteorológicas e pela descarga lagunar proveniente da bacia de drenagem. Com ...

Patos Lagoon is the largest receptor of fluvial waters used for agricultural, navigational and fishing activities in the state of Rio Grande do Sul. The dumping of industrial and domestic effluents into those waters is its ...

High frequency morphodynamic surveys permit to analyze, in detail, beach morphology changes. With the purpose to investigate daily beach profiles variability, surveys were carried during the summers of 2002 and 2003 at ...

This paper proposes an approach for using remote sensing data for identification and mapping of cyanobacterial blooms; Methods: It uses two sets of spectra (empirical and theoretical) as reference to classify the areas ...

A reduction in light intensity may increase shrimp activity, although it may also negatively a¡ect the development of photoautotrophic organisms present in bio¢lm, an important natural food source for shrimp. This ...

Juvenile silver fish (Rhamdia quelen)were exposed to the essential oil of Lippia alba and transported in plastic bags (10 specimens per bag, load density of 140–200 g.L−1) for different periods (5, 6 and 7 h) yielding final ...

Raphidiopsis brookii P. J. Hil(cyanobacteria) was isolated from a small subtropical eutrophic pond (Biguá Pond) located in the grounds of Rio Grande University in the extreme south of Brazil, following a toxic bloom of ...

A retração e progradação de zonas costeiras arenosas submetidas ao regime de micromarés resultam principalmente da da dinâmica entre a quantidade e o tipo de suprimento sedimentar, energia física das ondas e mudanças ...