Levy De Carvalho Gomes

• Dr.
• Visiting Assistant professor at Florida International University

This study evaluated the anesthetic activity of essential oil from Lippia alba (EOLA), linalool chemotype in a euryhaline fish (fat snook Centropomus parallelus). In the first experiment, fish were exposed to 30, 80, 130, 180, 200, and 230 µL EOLA L−1. The second experiment evaluated smaller and larger fish with 180 µL EOLA L-1. In the third experi...

This study evaluates the anesthetic effectiveness and potential reduction of toxicity in Nile tilapia (Oreochromis niloticus) through the use of clove, cinnamon, and tea tree essential oils. We evaluated genetic damage, enzymatic activity, and gene expression. We conducted two experiments. In experiment 1, we individually evaluated the anesthetic e...

We assessed the extent of pollution in an essential public water supply reservoir (southeastern Brazil). An environmental monitoring study was performed at the Billings Reservoir (at the water catchment site) to assess the water quality in 2017, 2018, and 2019. Physicochemical parameters were analyzed, quantifying the total cyanobacteria and the cy...

Wastes from iron ore mining activities are potentially damaging to adjacent aquatic ecosystems. We aimed to determine biomarkers of environmental exposure to this xenobiotic in dusky grouper Epinephelus marginatus by differential gene expression analysis. For this, fish were exposed to iron ore (15.2 mg/L) and gene expression in liver was assessed...

Changes in environmental conditions in aquatic ecosystems caused by anthropic actions can modify the composition of primary producers, promoting the excessive proliferation of cyanobacteria. These organisms can form cyanobacterial blooms, which directly affect aquatic life. The present study investigated the mutagenicity of the cyanobacterium Sphae...

Aquaculture activity in the aquatic ecosystem can intensify the presence of the semi-volatile compounds geosmin (GSM) and 2-methylisoborneol (MIB). These metabolites are the leading cause of off-flavor in fish from aquaculture facilities, even at small concentrations. Thus, this study aimed at evaluating the influence of tilapia production in cages...

The Fundão Dam collapsed, on November 5th, 2015, dumping more than 50 million/m³ of iron ore tailings, enriched with metals, into the Doce River channel. The objective of this study was to evaluate the reproductive biology and histological damage in Astyanax lacustris specimens exposed to the metals from the dam collapse. The study was carried out...

The aim of this study was to determine selected molecular biomarkers of iron ore contamination in Epinephelus marginatus. Molecular biomarkers were tested by checking the relative expression of genes involved in oxidative stress, trace element regulation, and cellular damage, by RT-qPCR. Iron ore exposure caused the downregulation of ferroportin (F...

This study aimed to evaluate the harmful effects of metal accumulation on Astyanax lacustris and their biochemical response when exposed to the metals contained in the Doce River, Brazil. The study was carried out in the Baixo Guandu region of the Doce River, Espírito Santo state. Samples were collected during the dry and wet seasons. Biochemical a...

An abundant population of Ucides cordatus swamp crabs is present at Lameirão Ecological Station (Brazil), a tropical ecosystem man-made with discharges of domestic, industrial and agricultural pollutants. Concentrations of heavy metals in water, sediment and muscle tissues, gills, hepatopancreas and exoskeleton present in crustaceans were analyzed....

This study investigated the ingestion of microplastics and artificial cellulose particles by 103 specimens belonging to 21 reef fish species from the southwestern Atlantic. Specimens of six species had ingested microplastics and artificial cellulose particles, while those of another three species had ingested only one type of material. In our sampl...

The Lippia alba essential oil (EO) is a fish anesthetic immiscible in water and commonly used diluted in ethanol. We evaluated the effectiveness of surfactant use with Lippia alba EO in the anesthesia of Oreochromis niloticus, as well as its toxicity in fish and mammals. The EO was extracted by hydrodistillation and the fish were exposed to anesthe...

On November 5 th , 2015, the Fundão Dam collapsed dumping more than 50 million/m ³ of iron ore tailings, enriched with metals, into the Doce River channel. The objective of this study was to evaluate the reproductive biology and histological damage in Astyanax lacustris exposed to the metals from the dam collapse. The study was carried out at Doce...

The dusky grouper Epinephelus marginatus is predator fish subjected to be impacted due to the contamination of their habitats. A viable source of metal contamination, i.e., copper (Cu), in this species is the ingestion of contaminated food. The objective of this work was to verify the toxic effects of Cu contaminated feed in dusky grouper. A 15 day...

Background The objective of this study was to verify the accumulation of trace metals in eggs and hatchlings of Chelonia mydas, evaluating if metal accumulation is originated from maternal transfer and/or from the incubation environment. Other assessments were also performed, as metal distribution in different tissues (blood, kidney, liver, muscle,...

The production of Nile tilapia (Oreochromis niloticus) in Brazil exhibits the highest growth rate in the world and represents approximately 45% of the total fish production. The objective of the present study was to assess the risk for human health due the consumption of tilapia farmed in net cages in eight aquaculture parks in Brazil. The concentr...

In 2015, after the Fundão dam failure, in Minas Gerais State, Brazil, around 50 million cubic meters of sludge from iron mining tailings were discharged into the Doce River. After the dam collapse, surpassing concentrations of metals were observed in the river sediment, which could be harmful to aquatic organisms, including the fishes. The present...

Astyanax lacustris is a freshwater characid fish species that inhabits small streams, lakes and rivers in South America. These fish are abundant in the wild and highly adaptable in captive, being considered a good model for ecotoxicological studies. Nevertheless, there are only shortcoming gene sequence information available in public databases, wh...

RESUMO Neobenedenia melleni (MacCallum, 1927) (Monogenea) é um patógeno amplamente distribuído em cultivo de teleósteos marinhos no mundo. Com o crescimento da piscicultura marinha no Brasil, faz-se necessário um maior cuidado em relação à identificação e ao tratamento das principais patologias nesse tipo de cultivo. Este estudo relata a primeira o...

Massive exploitation of geological resources may lead to serious environmental problems due to the inadequate disposal of the processing wastes, which are potentially hazard to terrestrial and aquatic environments. To evaluate the toxic effects of the residues generated in ornamental stones processing, Geophagus brasiliensis fish were contaminated...

Cadmium (Cd) is a highly toxic contaminant causing diverse physiologic damage through the food chain, possibly influencing the demography of wild populations. Thus study aimed to evaluate the feasibility of using Bothrops jararaca as an indicator of Cd contamination. For this purpose, 20 B. jararaca individuals were divided into four groups: a cont...

The ornamental stone industry generates considerable amounts of waste (OSPW), which may eventually reach natural environments and impact the local ecosystem. The aim of this study was to compare the toxic effects of two OSPW effluents in Geophagus brasiliensis: i) leachate effluent from a lagoon in an OSPW landfill (LE) and ii) decanted effluent fr...

The response of biochemical and hematological parameters were analyzed in dog snapper (Lutjanus jocu) grown in net cages, as well as for the specimens kept in the laboratory during an infestation by Neobenedenia melleni, and after treatment with freshwater bath and injectable application of levamisole. Significant changes were observed in N. mellen...

Lead is toxic to fish, and its toxicity can be aggravated by the water temperature. Geophagus brasiliensis populations are geographically widespread and thus live in areas with different temperatures. The objective of this work was to evaluate the effects of lead-contaminated feed in fish (Geophagus brasiliensis) exposed to different temperatures....

The Doce River basin has suffered the largest environmental accident ever occurred in Brazil with the influx of tailings from Fundão and Santarém, belonging to Samarco mining company, due to the disaster in Mariana. A spill between 50 and 60 million m3 of tailings was estimated by the company. According to Samarco, the wastewater was composed mainl...

Olive Ridley Sea Turtles (Lepidochelys olivacea) exhibit temperature-dependent sex determination (TSD). Knowledge of the influence of physical factors such as temperature on the nest environment is essential for understanding embryonic development and sex determination in sea turtles. Using field and laboratory data, we estimated the pivotal temper...

Formation water (FoW) is a by-product from oil and gas production and usually has high concentrations of soluble salts and metals. Calcium (Ca) and magnesium (Mg) have been shown to reduce the toxicity of metals to aquatic animals, and previous study showed that high waterborne Ca exerts mild effect against disturbances on Na⁺ regulation in Amazoni...

The objective of this study was to evaluate stress responses in dog snapper (Lutjanus jocu) during transport by evaluating their hematological and biochemical responses. Twenty-five wild dog snapper specimens were used in the experiment (220 ± 68 g and 24.5 ± 2.5 cm total length). Blood samples were collected prior to transport (control), and fish...

The objective of this study was to evaluate the effect of vaccination against Streptococcus agalactiae on the morphometry, bromatology, and sensory traits of tilapia bred in net-tanks. Tilapia juveniles were bred in net-tanks separated into two groups: vaccinated and unvaccinated fish. Ten fish from each group were collected from different weight c...

Oxygen and temperature are the most limiting factors in aquatic environments. Several species are exposed to variations of these factors in water because of physical, chemical and biological processes. The objective of this study was to evaluate the metabolic profile and the tolerance to the hypoxia of Geophagus brasiliensis exposed to changes in t...

Oxidative stress and hypoxia responses in Centropomus parallelus exposed to three different concentrations of nitrite (0, 0.5, and 10 mg L⁻¹) were evaluated. To determinate toxicity, we used enzymatic analyses and quantifications of oxygen consumption and opercular beats under conditions of normoxia and hypoxia. There was no significant difference...

"Erva cidreira" (Lippia alba (Mill.) N. E. Brown) is popular for its therapeutic properties, especially its sedative properties. Such properties led to the discovery of the anesthetic action of Lippia alba essential oil in fish culture. The objective of this study was to evaluate the genotoxic effect of Lippia alba essential oil in fish and mammals...

Quais as doses ou concentrações, bem como o tempo de aplicação, dos fármacos ou de outros produtos utilizados para tratar os animais contra bactérias, parasitas, fungos, vírus em aquicultura? Como anestesiar animais aquáticos? Quais produtos são úteis para melhorar o transporte de animais aquáticos? Como utilizar prebióticos, probióticos, estimulad...

This study evaluates the effects of exposure to manganese (Mn2+) for 96 hours at two different temperatures (24 and 27°C) on juveniles of Centropomus parallelus through the activities of glutathione S-transferase (GST) and catalase (CAT), micronuclei test (MN) and comet assay. The GST activity did not show any significant difference between the gro...

The sea urchin, Echinometra lucunter, is consumed in restaurants in Europe and Asia for high prices. This study evaluated the use of the essential oil of Lippia alba (EOL) as a sedative and anesthetic in this sea urchin. Different EOL concentrations were tested (50, 100 and 150 μL L⁻¹), in addition to a group that received ethanol and a control gro...

Green sea turtles ( Chelonia mydas ) with cutaneous fibropapillomatosis (FP) occur in some populations worldwide, and the survivability of these individuals may be compromised depending on the disease severity score. Furthermore, populations may be negatively affected in areas with a high prevalence of the disease. The stress responses (corticoster...

Two experiments were conducted to evaluate the effects of reducing dietary crude protein (CP), based on the ideal protein concept for Nile tilapia reared in net pens. The experimental (isocaloric, isocalcium, and isophosphoric) diets were formulated to contain 270, 300, 330, and 360g kg-1 CP. In experiment 1, 4320 Nile tilapia (13.5±0.82g) were use...

The aim of this study was to determine the level of dietary crude protein (CP) (480, 400, 440, 520 and 560g kg-1) in rations for juvenile II fat snook (Centropomus parallelus) that best promotes protein absorption and lower excretion of nitrogenous products. Three experiments were conducted: the first assessed the protein retention rate; the second...

We examine phytoplankton community structure and how it is influenced by commercial tilapia (Oreochromis niloticus L.) cage farming in three tropical lakes in eastern Brazil. Sampling occurred during both the wet and dry seasons for two treatments – within tilapia cages and outside the cages in the lake. Total ammonia, total phosphorus, chlorophyll...

This study analyzed the effectiveness of the essential oil of Aloysia triphylla (EOA) as an anesthetic and stress reducing agent in the transport of fat snook (Centropomus parallelus). Juveniles were exposed to different concentrations of EOA (seawater-adapted: 25-300µL L⁻¹; freshwater-adapted: 200µL L⁻¹) to identify the anesthetic induction and re...

This study evaluated the efficacy of mebendazole treatment in supplemented diet against the monogeneans Anacanthorus spathulatus, Notozotecium janauachensis and Mymarothecium boegeri gill parasites of an important native farmed characid fish Colossoma macropomum as well as its effect on the fish physiology. Fish were fed supplemented diet with 0, 0...

This study evaluated the efficacy of mebendazole treatment in supplemented diet against the monogeneans Anacanthorus spathulatus, Notozotecium janauachensis and Mymarothecium boegeri gill parasites of an important native farmed characid fish Colossoma macropomum as well as its effect on the fish physiology. Fish were fed supplemented diet with 0, 0...

Length–weight relationships (LWR) are presented for five fish species from the Restinga de Maricá, southeastern Brazil. Specimens were caught in pools and streams with different types of fishing gear: seine net, dip net, and sieve. The LWRs of three species are new for this region, and of Phalloptychus januarius are published for the first time.

Anthropogenic processes affect different communities through the release of contaminated effluents into water bodies. Copper can be found in the effluents of most industrial processes and in other effluent types. The fat snook Centropomus parallelus, found from Florida in the United States to southern Brazil, is of great economic importance and is...

This study evaluated the efficacy of mebendazole treatment in supplemented diet against the monogeneans Anacanthorus spathulatus, Notozotecium janauachensis and Mymarothecium boegeri gill parasites of an important native farmed characid fish Colossoma macropomum as well as its effect on the fish physiology. Fish were fed supplemented diet with 0, 0...

Hippocampus reidi is one of the most popular seahorse species in the aquarium trade. The commercial breeding of this species is an alternative to reducing the fishing pressure on natural populations. Two experiments with newly born juveniles were conducted in this study to assess salinity tolerance (Lethal Time for 50% of the population-LT50), surv...

The objective of this study was to isolate and select autochthonous strains of Bacillus subtilis from the fat snook, Centropomus parallelus, and examine the viability of the Bacillus bacteria to determine their beneficial effect on gut colonization in reared fish. Twenty strains of Bacillus were isolated and further confirmed as B. subtilis using P...

The effectiveness of menthol as anesthetic and sedative for fat snook (Centropomus parallelus) was tested at different salinities. In the first experiment, the fish were exposed to different concentrations of menthol (25, 37 and 50 mg L-1) in water at different salinities (0, 17 and 36 ppt). In the second experiment, the fish were transported for 1...

The aim of this study was to assess the effects of tilapia cage culture on the water quality and sediment of Palminhas Lake during both the dry and rainy seasons. Eight sites within the lake (four in fish farms and four in areas without fish farms) and one site on an affluent stream were sampled monthly from February 2011 to January 2012. Dissolved...

Recebido em 28/04/2015 Resumo-Nas últimas décadas, pesquisas na área da piscicultura com espécies nativas, vem sendo realizadas na Amazônia, destacando os trabalhos com o tambaqui (Colossoma macropomum), por ser uma espécie que apresenta bons índices zootécnicos em ambientes de confinamento, boa resistência ao manejo e a doenças e boa aceitação de...

Three experiments were designed to assess the accumulation and acute toxicity of copper (Cu) injuvenile fat snook Centropomus parallelus. The first experiment was performed to determine the 96-h lethal concentration (LC50) of Cu. The second experiment was designed to assess the effects of sublethal concentrations of Cu (0.47 and 0.94 mg/L), while t...

We investigated the use of beta 1,3 glucan as an imunostimulant during a transport experiment to determine the effects upon the stress response of the pencilfish (Nannostomus trifasciatus). Pencilfish were fed for seven days with different concentrations of beta 1,3 glucan: 0.0% (control); 0.01%; 0.1% and 0.5% of beta 1,3 glucan per kg of feed-1. F...

Cage fish farming in natural and artificial lakes has become increasingly popular in recent years in tropical countries. The most commonly farmed tropical fish species is the Nile tilapia (Oreochromis niloticus L.). The aim of this study was to characterize the concentration of phosphorus, total ammonia nitrogen and chlorophyll a from existing fish...

We investigated the use of beta 1,3 glucan as an imunostimulant during a transport experiment to determine the effects upon the stress response of the pencilfish (Nannostomus trifasciatus). Pencilfish were fed for seven days with different concentrations of beta 1,3 glucan: 0.0% (control); 0.01%; 0.1% and 0.5% of beta 1,3 glucan per kg of feed -1 ....

The cardinal tetra, Paracheirodon axelrodi (Schultz), is the most important ornamental fish exported from Brazil and Colombia. During the transport of this species, Amazon fishermen usually add unmeasured amounts of tetracycline and/or table salt to the water in an effort to mitigate stress and mortality. The aim of the present study was to analyze...

O objetivo deste trabalho foi avaliar o efeito da temperatura e da taxa de alimentação sobre o crescimento e a produtividade de juvenis de robalo-peva (Centropomus parallelus). Utilizou-se experimento fatorial com duas temperaturas (25 e 28º C) e duas taxas de alimentação (3 e 6% da biomassa ao dia), com três repetições para cada combinação de temp...

The aim of this study was to expose the Yellow-spotted River Turtle, Podocnemis unifilis, to dietary cadmium (Cd) contamination. The P. unifilis were fed with a Cd contaminated diet (590µgg(-1)) or a control diet for 30 and 60 days. After the Cd feeding period, the locomotor performance and specific growth rate were assessed. Blood samples were dra...

This study analyzed the chemical composition and anesthetic potential of essential oil (EO) of Nectandra megapotamica in fat snook (Centropomus parallelus). For the extraction of EO by hydrodistillation, leaves were separated in young (EO-Y) or old (EO-O), and the chemical composition of the EOs was determined by CG-MS. The anesthetic potential was...

Diesel oil can be a source of contamination in aquatic environments, mainly as a result of spills. The effects of the water-soluble fraction of diesel (WSF) on Prochilodus vimboides were assessed. Fish were exposed to three different WSF dilutions for up to 96 h and were compared to a control group. Damages in the fragments of DNA were analyzed usi...

We studied the recovery of juvenile fat snook (Centropomus parallelus) after subchronic exposure to different concentrations of copper. Healthy juveniles (1.98g) were exposed to 25 or 50μg Cu/L for 30days (12 replicates with 5 fish in each one), and recovery was observed at 0, 4, 10, and 30days after exposure (3 replicates with 5 fish in each one)....

http://dx.doi.org/10.5007/2175-7925.2012v25n4p221 O objetivo deste estudo foi avaliar as respostas fisiológicas de estresse de tambaquis (Colossoma macropomum) alimentados com dietas suplementadas com β-glucano e submetidos ao transporte em sistema fechado. Para isso, tambaquis (35,06±0,80g; 11,8±0,09cm) foram alimentados com dieta suplementada co...

The objective of this work was to evaluate the effect of salt (NaCl) on physiological responses and monogenean control in tambaqui (Colossoma macropomum). Juveniles of tambaqui (42.38 ± 0.47 g; 13.90 ± 0.06 cm) were transferred to 350L tanks and acclimated for a period of 24 hours. The assays were conducted using the concentrations of 0, 2, 4, 6 an...

Handling of live fish is inevitable in fish farms and causes a number of adverse physiological reactions, thus requiring the use of anesthetics. The main goal of the present work was to evaluate the efficiency of clove oil as an anesthetic for juvenile tilapia (approximately 55 g and 13 cm) during handling. In the first experiment, fishes were expo...

The present study evaluated the sensory, proximate and morphometric differences of pond and net-cagereared Nile tilapia (Oreochromis niloticus). Thirty samples from ponds and 30 samples from net-cages were used. Morphometric measurements were performed in fish and the fillets; proximate composition of the fillets was determined; and sensory analysi...

Este estudo avaliou as características reprodutivas de uma população do ouriço do mar Lytechinus variegatus e a influência do ciclo lunar na liberação de gametas. Foram realizadas oito coletas para avaliação do índice gonadossomático (IG) e dos parâmetros populacionais relacionados com a reprodução. Para avaliação do efeito da Lua na liberação de g...

Potamotrygon cf. histrix (cururu stingray) are endemic freshwater stingrays from the middle region of the Rio Negro in the Brazilian Amazon basin and are exported worldwide as ornamentals caught by artisanal fishermen. The transport process from capture to final destination is long and stressful. This study quantified stress related changes in cort...

This work evaluated the efficiency of clove oil as anaesthetic in handling and transportation of Nile tilapia, Oreochromis niloticus (Linnaeus, 1758). In the first experiment, safety concentrations of clove oil were assessed by measuring induction times to anaesthesia. The second experiment evaluated exposure times to anaesthetic. Clove oil efficie...

Formation water (produce water or oil field brine) from oil and gas production usually has high concentrations of soluble salts and metals. The objective of this study was to examine the effect of formation water from Urucu Reserve, Amazon, on whole-body uptake and internal distribution of newly accumulated Na+ in juvenile tamoatá, Hoplosternum lit...

The objective of this study was to test the efficiency of clove oil as an anesthetic for adult tilapia (Oreochromis niloticus) and to evaluate, sensorially, the aroma and taste of fillets after anesthesia. In the first experiment, fish were exposed to different clove oil concentrations (0, 100, 150, 200, 250 and 350 mg L-1) of anesthetic baths. In...

The aim of this study was to identify the times of anesthetic induction and recovery in slender seahorses (Hippocampus reidi) that were exposed to the essential oil of Lippia alba (EO), as well as the efficacy of EO as a stress-reducing agent in the transport of this species. Slender seahorses were placed in 1-L aquaria containing different concent...

The objective of this study was to test the efficiency of clove oil as an anesthetic for adult tilapia (Oreochromis niloticus) and to evaluate, sensorially, the aroma and taste of fillets after anesthesia. In the first experiment, fish were exposed to different clove oil concentrations (0, 100, 150, 200, 250 and 350 mg L-1) of anesthetic baths. In...

Esta segunda edição apresenta informações atualizadas e completas sobre a criação de várias espécies nativas de peixes brasileiros. Cada capítulo fornece ao leitor informações sobre biologia, reprodução e larvicultura, engorda, efeitos da qualidade da água, nutrição, doenças e transporte dessas espécies, sendo leitura obrigatória para pesquisadores...

Toxicity tests have been widely used as a form of monitoring degraded areas. This work has as objective to evaluate the toxicity of copper for Piauçu from the determination of LC50 for 96 hours and analysis of alterations in the enzymatic and leukocyte patterns, in sublethal exposure (25 and 50% of the lethal concentration) for 96 hours. The LC50 o...

3 levygomes@uvv.br Copyright © 2010 do(s) autor(es). Publicado pela ESFA [on line] http://www.naturezaonline.com.br Eutrópio FJ, Gomes LC (2010) Dieta alimentar de Trichomycterus longibarbatus Costa, 1992 e Pimelodella transitoria Miranda Ribeiro, 1905 (Siluriformes): um caso de competição interespecífica. Natureza on line 8 (2): 67-70. Dieta alime...

Toxicity tests have been widely used as a form of monitoring degraded areas. This work has as objective to evaluate the toxicity of copper for Piauçu from the determination of LC50 for 96 hours and analysis of alterations in the enzymatic and leukocyte patterns, in sublethal exposure (25 and 50% of the lethal concentration) for 96 hours. The LC 50...

Como forma de monitoramento de áreas degradadas, testes de toxicidade têm sido amplamente utilizados. Este trabalho teve como objetivo avaliar a toxicidade do cobre para o piauçu a partir da determinação da CL50 96h e da análise de alterações nos padrões enzimáticos e leucocitários, em exposição subletal (25 e 50% da concentração letal) por 96h. A...

The effectiveness of the addition of a potentially stress reducing probiotic during transportation of tambaqui juveniles was studied. Fish were transported with (20mg/L) and without probiotic in the water. The transport duration was 16 hours. After transportation, fish were placed in 150L tanks to monitor their recovery for 96-hours. The following...

Echinaster (Othilia) guyanensis Clark, 1987 is an endangered starfish distributed throughout the Caribbean and Atlantic Ocean. Even though it has been extensively harvested, little is known about the biology and ecology of this starfish. Here, we examine reproduction seasonality in E. (O.) guyanensis. Individuals were collected monthly for one year...

The high toxicity of diesel components makes oil spills a threat to the biota in coastal marine environments. The genotoxic effect of the diesel water-soluble fraction (DWSF) on Hippocampus reidi (Ginsburg, 1933) was assessed. Fish were exposed to three different DWSF dilutions for up to 96 hours, and genotoxicity was analyzed using the micronuclei...

The effectiveness of the addition of a potentially stress reducing probiotic during transportation of tambaqui juveniles was studied. Fish were transported with (20mg/L) and without probiotic in the water. The transport duration was 16 hours. After transportation, fish were placed in 150L tanks to monitor their recovery for 96-hours. The following...

Echinometra lucunter Linnaeus, 1758 is a tropical sea urchin with strong bioerosive potential. Consequently, this species has great ecological importance. The species occurs in high densities along the Brazilian coast, particularly in the south and southeast. The objective of this work was to evaluate both the effects of annual seasonality and the...

Fishes that live in the Amazonian environment may be exposed to several kinds of waters: "black waters", containing high dissolved organic carbon and acidic pH, "white waters", with ten fold higher Ca2+ concentrations than black waters and neutral pH, and "clear waters", with two fold higher Ca2+ concentrations than black waters and also neutral pH...

Ninety-six-hour static bioassays were conducted in the laboratory to determine lethal concentrations (96-h LC50) of copper and cadmium for curimatã (Prochilodus vimboides) and piauçu (Leporinus macrocephalus). The 96-h LC50 of copper were 0.047 and 0.090 mg L-1, and of cadmium 3.16 and 7.42 mg L-1 for curimatã and piauçu, respectively. Curimatã is...

Ninety-six-hour static bioassays were conducted in the laboratory to determine lethal concentrations (96-h LC50) of copper and cadmium for curimatã (Prochilodus vimboides) and piauçu (Leporinus macrocephalus). The 96-h LC50 of copper were 0.047 and 0.090 mg L-1, and of cadmium 3.16 and 7.42 mg L-1 for curimatã and piauçu, respectively. Curimatã is...

This work tested the effectiveness of menthol as anesthetic for Nile tilápia (Oreochromis niloticus) by the evaluation of behavioral events, the safety margin of the anesthetic, and stress response. On first experiment, six different anesthetic concentrations were tested to evaluate the induction time to anesthesia. On second experiment, two tests...

This work tested the effectiveness of menthol as anesthetic for Nile tilapia (Oreochromis niloticus) by the evaluation of behavioral events, the safety margin of the anesthetic, and stress response. On first experiment, six different anesthetic concentrations were tested to evaluate the induction time to anesthesia. On second experiment, two tests...

This study evaluated the impact of pond management on tambaqui, Colossoma macropomum (Cuvier), rearing during the growout phase. Juvenile tambaqui were stocked in ponds with three different management regimes: (1) natural ponds (Nat); (2) limed ponds (Lim); and (3) limed and bimonthly fertilized ponds (LimFer). The experiment lasted 210 days and th...

Matrinxã (Brycon amazonicus) is a freshwater neotropical fish species with a social interaction and aggressive behavior, especially in crowded environments. This species' social structure is established by agonistic interactions, which increase significantly at the fifth hour, when compared to the first and second hours of confinement, when each do...

Fishes that live in the Amazon environment may be exposed to several kinds of water: black water (BW), acidic black water (pH 3.5) (ABW) and white water (WW), among others. The aim of the present study was to analyze net ion fluxes in the facultative air-breather Hoplosternum littorale (tamoata) and the obligate air-breather Arapaima gigas (piraruc...

Pirarucu is a native fish of the Amazon basin, widely used in culture systems in some parts of Brazil. The objective of this work was to test table salt as a stress mitigator during transportation of pirarucu juveniles (1kg). Fish were transported by two different systems: boxes without addition of oxygen (open system) and closed oxygen filled plas...

The objective of this experiment was to test the efficacy of a probiotic (Efinol®L) during transportation of marbled hatchetfish, Carnegiella strigata. Wild specimens were captured from a small stream and transported for 24 h in plastic fish boxes with a probiotic (10 mg L−1) and probiotic-free water. The boxes were sampled at 3, 12 and 24 h of tra...