7 research outputs found
Biochemical parameters of silver catfish (Rhamdia quelen) after transport with eugenol or essential oil of Lippia alba added to the water
The transport of live fish is a routine practice in aquaculture and constitutes a considerable source of stress to the animals. The addition of anesthetic to the water used for fish transport can prevent or mitigate the deleterious effects of transport stress. This study investigated the effects of the addition of eugenol (EUG) (1.5 or 3.0 mu L L-1) and essential oil of Lippia alba (EOL) (10 or 20 mu L L-1) on metabolic parameters (glycogen, lactate and total protein levels) in liver and muscle, acetylcholinesterase activity (AChE) in muscle and brain, and the levels of protein carbonyl (PC), thiobarbituric acid reactive substances (TBARS) and nonprotein thiol groups (NPSH) and activity of glutathione-S-transferase in the liver of silver catfish (Rhamdia quelen; Quoy and Gaimard, 1824) transported for four hours in plastic bags (loading density of 169.2 g L-1). The addition of various concentrations of EUG (1.5 or 3.0 mu L L-1) and EOL (10 or 20 mu L L-1) to the transport water is advisable for the transportation of silver catfish, since both concentrations of these substances increased the levels of NPSH antioxidant and decreased the TBARS levels in the liver. In addition, the lower liver levels of glycogen and lactate in these groups and lower AChE activity in the brain (EOL 10 or 20 mu L L-1) compared to the control group indicate that the energetic metabolism and neurotransmission were lower after administration of anesthetics, contributing to the maintenance of homeostasis and sedation status.Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul (FAPERGS/PRONEX) [10/0016-8]; Conselho Nacional de Pesquisa e Desenvolvimento Cientifico (CNPq) [470964/2009-0]; Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES); CNPqinfo:eu-repo/semantics/publishedVersio
The state of Britain’s larger moths 2021
This report summarises current knowledge of the state of Britain’s c.900 species of larger moths, presenting analyses of long-term change based on millions of records gathered through the Rothamsted Insect Survey (RIS) and National Moth Recording Scheme (NMRS)
Avaliação de respostas metabólicas do tambaqui exposto ao eugenol em banhos anestésicos Evaluation of tambaqui metabolic responses to eugenol in anesthetics baths
O tambaqui Ă© a principal espĂ©cie de peixe cultivado na AmazĂ´nia Ocidental. PorĂ©m durante o processo produtivo, práticas de manejo sĂŁo necessárias para o monitoramento do crescimento e estado geral da sanidade dos animais. Para isso os animais devem ser anestesiados para maior segurança no trabalho. O eugenol, componente majoritário do Ăłleo de cravo, tem sido bastante utilizado como anestĂ©sico alternativo para peixes por ser um produto natural e de baixo custo. Entretanto, estudos tratando de respostas metabĂłlicas em peixes tropicais expostos a diferentes anestĂ©sicos sĂŁo ainda necessários. Dentro desse intuito, o presente trabalho avaliou respostas metabĂłlicas, detectadas por meio de alterações de parâmetros sanguĂneos e plasmáticos do tambaqui, exposto ao eugenol em banhos anestĂ©sicos simulados. Respostas tĂpicas ao estresse foram detectadas devido ao manuseio imposto aos peixes durante a realização dos banhos anestĂ©sicos. O eugenol nĂŁo reduziu totalmente essas reações ao estresse. Por outro lado, esse anestĂ©sico nĂŁo provocou estresse adicional em exposições curtas de 15 min em concentrações prĂłximas a 20 mg L-1.<br>Tambaqui is the main farmed fish in the Western Amazon. However, in handling this fish has to be anesthetized for safety purposes, usually when evaluating growth and health conditions. Eugenol, the main component of clove oil, has been reported as an alternative fish anesthetic, because it is an inexpensive natural product. However, continued studies are necessary about the metabolic responses of tropical fish to anesthetics. The present work evaluated metabolic responses of tambaqui to eugenol in simulated anesthetic baths, measuring blood and plasma parameters. Typical metabolic stress responses to handling were detected, but they were not totally reduced by eugenol. On the other hand, the anesthetic dissolved in water did not provoke any extra charge of stress during short-term exposures in concentrations of about 20mg L-1 for 15 min
Effects of clove oil on the stress response of matrinxĂŁ (Brycon cephalus) subjected to transport
Fish transport is one of the most stressful procedures in aquaculture facilities. The present work evaluated the stress response of matrinxã to transportation procedures, and the use of clove oil as an alternative to reduce the stress response to transport in matrinxã (Brycon cephalus). Clove oil solutions were tested in concentrations of 0, 1, 5 and 10 mg/L during matrinxã transportation in plastic bags, supplied with water and oxygen as the usual field procedures in Brazil. Clove oil reduced some of the physiological stress responses (plasma cortisol, glucose and ions) that we measured. The high energetic cost to matrinxã cope with the transport stress was clear by the decrease of liver glycogen after transport. Our results suggest that clove oil (5 mg/l) can mitigate the stress response in matrinxã subjected to transport