Effect of photoperiod stress assessment and locomotor activity of female lambari (Astyanax bimaculatu)

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.Index terms: Fish, synchronizer, glucose, cortisol, swimming behaviour. RESUMOAlguns estudos científicos e investimentos têm sido realizados na aquicultura com o objetivo de minimizar o estresse dos peixes, por diversos fatores, como a gestão, a salinidade do estado nutricional, qualidade da água, temperatura, fotoperíodo e salinidade. Este trabalho teve como objetivo verificar o efeito do fotoperíodo na atividade locomotora e níveis plasmáticos de cortisol e glicose em fêmeas de lambari. Cento e vinte fêmeas de lambaris adultas foram mantidas em aquários de 20 litros cada um, em delineamento inteiramente ao acaso, com três tratamentos (T1 = 0 Luz:24 Escuro, T2 = 12L:12E, T3 = 24L:0E) e quatro repetições. A atividade locomotora diária dos lambaris foi registrada durante 15 dias por meio de uma fotocélula infravermelha. Após 40 dias de experimento os peixes, mantidos a jejum de 24 horas, foram previamente anestesiados com benzocaína. As fêmeas de lambaris apresentaram um ritmo de atividade locomotora diurna. Lambaris submetidos aos fotoperíodos 12L:12E e 24L:0E apresentaram maiores níveis de cortisol (12L:12E: 190.00 ± 37.73 ng/mL e 24L:0E: 148.850 ± 32.77 ng/mL) e atividade locomotora, além de menores taxas de sobrevivência (30,0 ± 7,07%) em relação ao regime de 0L:24E (cortisol: 85.570± 7.99 ng/mL, taxa de sobrevivência: 72.5± 4.330%) A concentração de glicose (32.167 ± 22.73 mg/dL) e o crescimento (7.050±0,59cm) dos peixe...

Damages Done by Black Bear (Ursus thibetanus) in Moji Game Reserve and its Surroundings, Leepa Valley, Azad Jammu and Kashmir (Pakistan)

“…In European catfish (S. glanis), Kozlowski and Poczyczynski (1999) discovered that light caused a hostile attitude and more gathering of this species at the base, close to the walls and in tank corners, which eventually raised cannibalism and diminished overall growth. Yet, the manipulation of photoperiod had no impact upon the entire length and body weight of Verasper moseri (Amano et al, 2004) and Oreochromis niloticus (Campos-Mendoza et al, 2004), and female lambari (Navarro et al, 2014).…”

Effects of heat shock on energy metabolism and antioxidant defence in a tropical fish speciesPsalidodon bifasciatus

“…The fish were kept in 830 l tanks for 3 days under controlled temperature conditions (21 ± 0.5°C) (da Silva & de Oliveira, 2018) with a natural photoperiod of c . 11 h of light/13 h of darkness and constant aeration for acclimation (Chung, 2000; Navarro et al ., 2014). The tanks were in closed systems and cleaned daily by suction, and approximately 50% of the water was renewed with spring water (Lermen et al ., 2004).…”

A Detailed Analysis of the Effect of Different Environmental Factors on Fish Phototactic Behavior: Directional Fish Guiding and Expelling Technique

“…Luminosity is an essential environmental parameter for fish survival [13]. The manipulation of light intensity can regulate biological rhythms and physiological functions of fish, such as survival [47], growth [48], activity [49], feeding [50], and aggressive behavior [51,52]. Generally, the swimming style of fish changes across the day with the change in the ambient light intensity [53].…”