|
|
|
|
| |
|
| |
|
|
| Abreu,Janessa S.; Brinn,Richard P.; Gomes,Levy C.; McComb,Dawn Michelle; Baldisserotto,Bernardo; Zaiden,Sérgio F.; Urbinati,Elisabeth C.; Marcon,Jaydione L.. |
| 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. Fish were then transported for 24 hours by boat from Barcelos to Manaus. The highest dose of beta 1,3 glucan in the food increased Na+influx after 12 hours of transport and 0.1 and 0.5% beta 1,3 glucan maintained the flux of both ions close to zero at 24 hours. All doses of beta 1,3 glucan reduced K+ loss significantly in the beginning of the transport, but after 12 to 24 hours did not. No significant differences... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cortisol; Immunostimulant; Ion fluxes; Ornamental fish; Rio Negro basin. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000300623 |
| |
|
|
| Simões,Larissa N.; Lombardi,Danielle C.; Gomide,Andrea T. M.; Gomes,Levy C.. |
| 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 efficiency during transportation was evaluated in a 24 h experiment using three concentrations of the anaesthetic (0, 9, and 18 mg.L-1). The most appropriate clove oil concentration to induce surgical anaesthesia was 90 mg.L-1. To biometry or other brief handling, the recommended concentration is 50-60 mg.L-1 as it provides fast recovery. Maximum anaesthesia time should be 10 min. The mortality rate of fish transported... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eugenol; Net ion flux; Stress; Tropical fish. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000300001 |
| |
|
| |
|
|
| Mariante,Fátima L. F.; Lemos,Gabriela B.; Eutrópio,Frederico J.; Castro,Rodrigo R. L.; Gomes,Levy C.. |
| 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, including four complete lunar phases. The gonad index (GI) was calculated to determine annual and monthly reproductive peaks. Gametogenesis stages were also determined. Sex ratio was 1:1.33 (M:F). Gonadosomatic index, body weight, central disc width and arm length were similar for both sexes. Gonads were present in all animals with arm length greater than 36.2 mm. Lunar phase was not associated with E. (O.)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazil; Reproduction; Gametogenesis; Gonad index; Lunar periodicity. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000600010 |
| |
|
|
| Pereira,Jéssica A.; Veronez,Alexandra C.S.; Coppo,Gabriel C.; Duca,Charles; Chippari-Gomes,Adriana R.; Gomes,Levy C.. |
| ABSTRACT 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 temperature and oxygen availability. The fish were exposed to 20 and 90% of oxygen saturation combined with different temperatures (20°, 24° and 28° C) for 8 h. Hepatic and muscular glycogen, as well as the activities of lactate dehydrogenase (LDH), malate dehydrogenase (MDH), citrate synthase (CS) and their ratios were evaluated. Both glycogen and MDH activity showed a significant difference in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aerobic and anaerobic pathways; Behavior; Metabolism; Oxygen. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100202 |
| |
|
|
|
