Influence of color background and shelter availability on jundiá (Rhamdia quelen) stress response

Barcellos, Leonardo José Gil; Kreutz, Luiz Carlos; Quevedo, Rosmari Mezzalira; Rosa, João Gabriel Santos da; Koakoski, Gessi; Centenaro, Lucas; Pottker, Emanuele Serro

doi:10.1016/j.aquaculture.2008.11.002

Cited by 83 publications

(50 citation statements)

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“…This result is in accordance with the fact that the presence of a shelter in the tank reduced whole body plasma cortisol peak values and their duration in previously stressed silver catfish (Barcellos et al, 2009). Shelter seeking tendencies were also observed in channel catfish Ictalurus punctatus (Brown et al, 1970).…”

Section: Discussionsupporting

confidence: 75%

“…Consequently, the objective of this study was to determine the preferred pH in silver catfish acclimated to different water hardness or infected by I. multifiliis. In addition, as silver catfish is less stressed when in a shelter (Barcellos et al, 2009), an analysis was also made of whether or not the presence of shelters can change the preferred pH.…”

Section: Introductionmentioning

confidence: 99%

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Preference behavior of silver catfish, Rhamdia quelen, juveniles in waters with pH gradients: laboratory experiments

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The aim of this study was to determine the preferred pH in silver catfish Rhamdia quelen juveniles acclimated to different water hardness and the effect of shelters and infection by Ichthyophthirius multifiliis. Fish were acclimated for two weeks at different water hardness levels (4, 24, 50, or 100 mg CaCO 3 L -1) and then transferred to a polyethylene tube with a pH gradient ranging from 3.5 to 11.7 and maintaining the same hardness. The position of the fish in the pH gradient was observed at 1, 2, 4, 6, 8, 10, and 12 h after transfer. Acclimation to different water hardness did not change pH preference of uninfected silver catfish (pH 7.30-7.83), and the presence of a shelter at the preferred pH or outside this preferred pH did not change the chosen pH range, either. Consequently silver catfish favored the acid-base regulation over shelter seeking tendency. Juveniles infected with I. multifiliis acclimated to water hardness of 24 mg CaCO 3 L -1 preferred alkaline pH (9.08-9.79). This choice is not explained by the higher Na + levels at alkaline pH compared to neutral pH because infected and uninfected fish choose the same waterborne Na + levels in a Na + gradient with the same pH.O objetivo deste estudo foi determinar o pH preferencial de juvenis de jundiá Rhamdia quelen aclimatados a diferentes durezas da água e o efeito de abrigos e infecção por Ichthyophthirius multifiliis. Os peixes foram aclimatados durante duas semanas em diferentes níveis de dureza da água (4, 24, 50 ou 100 mg CaCO 3 L -1 ) e então transferidos para um tubo de polietileno com um gradiente de pH de 3,5-11,7, mantendo a mesma dureza. A posição do peixe no gradiente de pH foi observada 1, 2, 4, 6, 8, 10 e 12 h após a transferência. A aclimatação a diferentes durezas da água não afetou o pH preferencial de jundiás não infectados (pH 7,30-7,83), e a presença de um abrigo no pH preferido ou fora deste pH também não alterou a faixa de pH preferida. Portanto, jundiás favorecem a regulação ácido-base em detrimento a uma tendência de procurar abrigo. Em juvenis infectados com I. multifiliis aclimatados à dureza da água de 24 mg L -1 de CaCO 3 o pH preferencial é alcalino (9,08-9,79). Esta escolha não é explicada pelos maiores níveis de Na + em pH alcalino que em pH neutro porque peixes infectados e não infectados escolheram os mesmos níveis de Na + na água em um gradiente de Na + com o mesmo pH.

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Section: Discussionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Preference behavior of silver catfish, Rhamdia quelen, juveniles in waters with pH gradients: laboratory experiments

et al. 2013

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“…The time intervals were chosen because of the cortisol profiles measured previously in R. quelen (Barcellos et al, 2009;Koakoski et al, 2012). We choose for experiments "A1" and "B1" an interval smaller than the 24-h recovery period; for experiments "A2" and "B2," an interval bigger than the recovery period; and for experiments "A3" and "B3," an interval of several days after the cortisol profile recovery.…”

Section: Methodsmentioning

confidence: 99%

“…Fish from group 4 were exposed to both the first and second handling stressors, separated by 12h, 48h, and 1 week; after 12h, 48h and 1 week, respectively, the fish were exposed to a third acute stressor consisting of aerial emersion for 60 sec, which was followed by cortisol measurement. Both handling and aerial emersion causes stress in R. quelen resulting in a typical cortisol response (Barcellos et al, 2009;Barcellos et al, 2011). Additionally, control fish were maintained in the same conditions without any provoked disturbance and were named as control 12h, 48h, and first week; 24h, 96h, and second week; and 36h, 144h, and third week.…”

Section: Methodsmentioning

confidence: 99%

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Repeated stressors do not provoke habituation or accumulation of the stress response in the catfish Rhamdia quelen

et al. 2013

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Fish repeatedly experience stressful situations under experimental and aquaculture conditions, even in their natural habitat. Fish submitted to sequential stressors can exhibit accumulation or habituation on its cortisol response. We posed a central question about the cortisol response profiles after exposure to successive acute stressors of a similar and different nature in Rhamdia quelen. We have shown that successive acute stressors delivered with 12-h, 48-h, and 1-week intervals provoked similar cortisol responses in juvenile R. quelen, without any habituation or accumulation. The cumulative stress response is more associated to short acute stressors with very short intervals of minutes to hours. In our work, we used an interval as short as 12h, and no cumulative response was found. However, if the length of time between stressors is of a day or week as used in our work the most common and an expected phenomenon is the attenuation of the response. Thus, also, the absence of both accumulation of the stress response and the expected habituation is an intriguing result. Our results show that R. quelen does not show habituation or accumulation in its stress responses to repeated stressors, as reported for other fish species

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Avoiding Predators

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Aquaculture and Behavior

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Influence of color background and shelter availability on jundiá (Rhamdia quelen) stress response

Cited by 83 publications

References 28 publications

Preference behavior of silver catfish, Rhamdia quelen, juveniles in waters with pH gradients: laboratory experiments

Preference behavior of silver catfish, Rhamdia quelen, juveniles in waters with pH gradients: laboratory experiments

Repeated stressors do not provoke habituation or accumulation of the stress response in the catfish Rhamdia quelen

Avoiding Predators

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