16 documents found, page 1 of 2

Tambaqui growth reared in cages in a floodplain lake under different feeding rate

The objective of this work was to estimate the effect of feeding rates, 5%, 7.5% and 10% of body weight per day, on growth performance and metabolic parameters of tambaqui, Colossoma macropomum, reared in cages located in a floodplain lake. Fish fed at 5% of body weight per day presented better feed conversion; total plasma protein values, after 90 days, were significantly lower than in other treatments. A dail...

Recovery of fat snook, Centropomus parallelus (Teleostei: Perciformes) after su...

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

Assessment on the effect of salt and density on tambaqui fish transportation

The objectives of this study were to evaluate the efficiency of salt as a stress reductor and to determine the best transportation density for tambaqui (Colossoma macropomum) juveniles in customized plastic boxes. In the first experiment different concentrations of cooking salt (NaCl) in the water were tested, and in the second experiment the fishes were transported for three hours in 200 L plastic boxes using ...

Calcium fluxes in Hoplosternum littorale (tamoatá) exposed to different types o...

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. Therefore, the aim of the present study was to analyze Ca2+ fl...

Efeito do cloreto de sódio sobre as respostas fisiológicas e controle de helmin...

O objetivo deste trabalho foi avaliar o efeito do sal (NaCl) sobre as respostas fisiológicas e controle de helmintos monogenóides em tambaqui (Colossoma macropomum). Para isso, juvenis de tambaqui (42,38 ± 0,47 g; 13,90 ± 0,06 cm) foram transferidos para tanques de 350L e aclimatados por um período de 24 horas. Os ensaios foram conduzidos utilizando as concentrações de 0, 2, 4, 6 e 8 g de sal comum L-1 de água,...

Safest level of tricaine methanesulfonate (ms-222) to induce anesthesia in juve...

Investigou-se o uso de MS-222 como anestésico para juvenis de matrinxã. Concentrações de 100 mg/L ou menores não causam uma indução completa à anestesia. A 150 mg/L os peixes foram induzidos à anestesia após 36 segundos e se recuperam em 5,2 minutos após exposição ao anestésico durante 10 minutos. Em concentrações maiores (200, 250 e 300 mg/L) os peixes foram induzidos a anestesia em menor tempo, porém observou...

A eficácia do mentol como anestésico para tambaqui (Colossoma macropomum, Chara...

Os anestésicos são importantes na piscicultura para reduzir o estresse e a mortalidade no manejo. Este trabalho tem como objetivo determinar a eficácia do mentol para tambaqui durante o manejo. Na primeira série de testes, foi examinado o efeito da concentração de anestésico sobre indução à anestesia e o estresse de tambaqui. Na segunda série de testes, foi avaliada a recuperação dos peixes após a exposição a u...

Safest Level Of Tricaine Methanesulfonate (ms-222) To Induce Anesthesia In Juve...

The use of clove oil as an anesthetic for advanced juvenile tilapia (Oreochromi...

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 exposed to an anesthetic bath at six concentrations (80, 100, 150, 2...

Ammonia excretion by tambaqui (Colossoma macropomum) related to water temperatu...

Ammonia, an excretion product of fish, is toxic to aquatic organisms. The objective of this study was to account daily ammonia excretion rates of tambaqui (Colossoma macropomum), the main fish species of the Amazonia related to water temperature and fish mass. Ammonia excretion rates were measured every two hours during a 24-hour period and results were evaluated by a multiple linear regression. Tambaqui presen...