Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/57492
Title: Effect of photoperiod stress assessment and locomotor activity of female lambari (Astyanax bimaculatu)
Other Titles: Efeito do fotoperíodo na avaliação do estresse e na atividade locomotora em fêmeas de lambari (Astyanax bimaculatus)
Keywords: Fish - Behaviour
Synchronizer
Glucose
Cortisol
Swimming behaviour
Peixe - Comportamento
Sincronizador
Glicose
Comportamento natatório
Issue Date: 2014
Publisher: Universidade Federal de Lavras
Citation: NAVARRO, F. K. S. P. et al. Effect of photoperiod stress assessment and locomotor activity of female lambari (Astyanax bimaculatu). Ciência e Agrotecnologia, Lavras, v. 38, n. 2, p. 173-180, mar./abr. 2014.
Abstract: Some studies and scientific investments have been done in aquaculture aiming to minimize the stress of the fish due to different factors, as management, nutritional status, water quality, temperature, photoperiod, and salinity. This study aimed to verify the effect of photoperiod on locomotor activity and plasma levels of cortisol and glucose in female Lambari. One hundred and twenty female Lambari adult were maintained in aquaria of 20 liters each in a completely randomized design with three treatments (T1 = 0Light: 24Dark, T2 = 12L: 12D, T3 = 24L: 0D) and four replications. The daily locomotor activity was registered during 15 days using an infrared photocell. After 40 days of experiment and previous fasting for 24 hours, fish were euthanized by a lethal dose of benzocaine. Female Lambari featured a diurnal rhythm of locomotor activity. Lambari subjected to 12:12 and LD photoperiod presented higher cortisol (12L:12E: 190.00 ± 37.73 ng/mL e 24L:0E: 148.850 ± 32.77 ng/mL) and locomotor activity levels and also lower survival rates (30.0 ± 7.07%) when compared to the LD photoperiod (cortisol: 85.570 ± 7.99 ng/mL, survival rates: 72.5 ± 4.330%). The glucose concentration (32.167 ± 22.73 mg/dL) and the growth (7.050 ±0.59cm) of fish subjected to LD photoperiod was significantly lower than in the other treatments. We conclude that light plays an important role in the growth, behavior and welfare of female Lambari. Besides, our data highlighted that fish submitted to a long light period present a more stressed and more aggressive status when compared to fish submitted to a continuous darkness.
URI: http://repositorio.ufla.br/jspui/handle/1/57492
Appears in Collections:DMV - Artigos publicados em periódicos

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