Parâmetros hematológicos e bioquímicos da tilápia-do-Nilo (Oreochromis niloticus L.) sob estresse por exposição ao ar

Abstract

Pesq. Vet. Bras. 32(Supl. The present study evaluated the hematological and biochemical parameters of adult tilapia (Oreochromis niloticus) under the influence of the physiological stress factor in animals submitted to air exposure during fattening in raceway system. Blood cell count, hemoglobin, hematocrit, mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC), leukogram, differencial leukocyte count, platelet, glucose, total protein, cholesterol, triglycerides and electrolytes (calcium, chloride, sodium and potassium) were analyzed. The results showed a uniform distribution for red blood cells, hematocrit, hemoglobin, secondary Wintrobe indices, total protein, glucose, cholesterol, and serum ions, indicated by a relatively low variation coefficient. There was positive correlation only for total white blood cells, organic defense cells (neutrophils and lymphocytes), glucose, cholesterol, sodium and calcium. As for the leukocytes (WBC), as the animals were exposed to aeration, the number of leukocytes gradually decreased (leukopenia), simultaneously occurring neutrophilia and lymphopenia. The glycemic index was a good indicator of physiological stress due to hyperglycemia (82.0+20.88mg/dL) demonstrated in the treatments. The air exposure constituted an imbalance factor at the ion homeostasis and at the endogenous cholesterol synthesis. Besides, the recovery time did not result in the complete physiological rehabilitation face the imposed challenge.

Alterações leucocitárias ocasionadas pelo estresse toxicológico agudo do óleo diesel em juvenis de tilápia-do-nilo

“…Essas alterações comportamentais são uma das respostas ao estresse ocasionado pela exposição dos animais ao produto tóxico, causando alterações nos valores glicêmicos, que é uma resposta secundária utilizada como indicador de estresse em peixes (WINKALER et al, 2001;SILVA et al, 2012;CHAGAS et al, 2012). Neste estudo foi visto aumento (p<5%) na glicemia (Fig.…”

“…Os linfócitos são células responsáveis pela produção de anticorpos e pela parte humoral em peixes (SILVA et al, 2012). Pode-se inferir, neste estudo, que a sua redução está associada com o estresse ocasionado pelo óleo diesel, tendo em vista que o estresse prolongado pode provocar imunossupressão, debilitando o sistema imunológico dos organismos submetidos a xenobióticos (FUJIMOTO et al, 2012).…”

Resposta hematológica do cascudo ornamental amazônico Peckoltia oligospila ao estresse de transporte

“…3A) e o VCM (Fig. 3B) (Silva et al, 2012;Fujimoto et al, 2013). CHCM: concentração de hemoglobina corpuscular média.…”

Induced aerocystitis and hemato-immunological parameters in Nile tilapia fed supplemented diet with essential oil of <i>Lippia alba</i>

“…The present results suggest no influence of the carrageenin injection on cortisol levels since no difference was found when compared to noninjected fish. Increased cortisol levels could be associated with two factors: fish handling prior to blood samples and air exposition (BARCELLOS et al, 1999;SILVA et al, 2012), and due to high-responsive individuals in the same fish population subjected to confinement stress as previously related (FEVOLDEN;RØED, 1993). It must be emphasized that the fish management for blood samples followed the same methods used previously and the increased cortisol levels did not influence the inflammatory response.…”