Evaluating feeding as unconditioned stimulus for conditioning of an endocrine effect in Nile tilapia

Barreto, Rodrigo Egydio; Volpato, Gilson Luiz

doi:10.1016/j.physbeh.2007.06.013

Cited by 9 publications

(16 citation statements)

References 32 publications

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“…Nile tilapia, Oreochromis niloticus was used as a model species due to its well characterized behaviour, endocrine and physiological profiles in different behavioural paradigms, including conditioning [26], [27].…”

Section: Introductionmentioning

confidence: 99%

Linking Fearfulness and Coping Styles in Fish

et al. 2011

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Consistent individual differences in cognitive appraisal and emotional reactivity, including fearfulness, are important personality traits in humans, non-human mammals, and birds. Comparative studies on teleost fishes support the existence of coping styles and behavioral syndromes also in poikilothermic animals. The functionalist approach to emotions hold that emotions have evolved to ensure appropriate behavioral responses to dangerous or rewarding stimuli. Little information is however available on how evolutionary widespread these putative links between personality and the expression of emotional or affective states such as fear are. Here we disclose that individual variation in coping style predicts fear responses in Nile tilapia Oreochromis niloticus, using the principle of avoidance learning. Fish previously screened for coping style were given the possibility to escape a signalled aversive stimulus. Fearful individuals showed a range of typically reactive traits such as slow recovery of feed intake in a novel environment, neophobia, and high post-stress cortisol levels. Hence, emotional reactivity and appraisal would appear to be an essential component of animal personality in species distributed throughout the vertebrate subphylum.

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Section: Introductionmentioning

confidence: 99%

Linking Fearfulness and Coping Styles in Fish

et al. 2011

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“…The physiological and behavioral responses of the seahorses to anesthesia were relatively few, while the clove oil and MS‐222 have been widely used for adult seahorses during scientific experiments (Woods ; Woods and Martin‐Smith ; Castro et al ; Otero‐Ferrer et al ; Pawar et al ). Generally, anesthetic treatment can avoid unnecessary pain, stress, and suffering and improve fish welfare, but the range of effective concentrations was vital because the unsuitable anesthetic concentrations or prolonged exposure times can induce over‐stress and even death in some fish (Barreto and Volpato ). If fish are heavily sedated, they might lose equilibrium, cease swimming, and die from suffocation.…”

Section: Discussionmentioning

confidence: 99%

Effects of Anesthetic Disposal on the Physiological and Behavioral Responses of the Lined Seahorses, Hippocampus erectus

Qin

Zhang

Wang

et al. 2016

J World Aquaculture Soc

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Anesthetic disposal for fish often results in physiological and behavioral responses. There is limited information involved on the metabolic and behavioral responses of the seahorses. The lined seahorse,Hippocampus erectus, is of great interest in the sciences because of its unusual S-shaped morphology and male pregnancy behavior. This study found that the lined seahorse could be effectively anesthetized into Stage II at the concentrations of 10 mg/L clove oil or 20 mg/L MS-222 based on the comparison of six different treatments. The ventilation frequency, oxygen consumption, and ammonia-N excretion of the seahorses were decreased significantly as soon as they were exposed to the anesthetic agents. A higher O : N ratio was found in seahorses anesthetized by clove oil as compared to those exposed to MS-222. After the anesthetic treatment, the feeding frequencies of recovered seahorses were low at the beginning and then increased during the 7-d culture. Moreover, there was no incremental difference of wet weights among the tested seahorses (P = 0.534). The findings indicate that the anesthetic process has few effects on the feeding and short-term growth of seahorses in spite of the occurrence of physiological and behavioral responses.

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“…To induce a stress response, we exposed fish to a combination of air exposure and novel environmental stressors. Catfish were individually netted and maintained out of water for 2 min [40] and subsequently introduced to a novel environment for 5 min (aquarium; footprint 40 x 60 cm; water level 10 cm; no shelters; based on Barreto and Volpato [41]). A set of approximately 10 photos of fish eyes was taken through the glass of the aquarium after this procedure using a Canon EOS 650D camera (18 Mpx CMOS hybrid sensor) with a macro lens (Canon Inc., Japan).…”

Section: Experiments I: Psv and Cortisol Concentrationmentioning

confidence: 99%

“…These relationships have yet to be investigated in fish. The aims of our study were I) to test if there is a relationship between PSV and cortisol levels in pigmented as well as albino fish under a standardized acute stress exposure [40,41] in a methodological experiment and II) to test the application of the PSV methodology under more complex socially induced stress [42][43][44] in albinos that have several physiological, behavioral and social alterations when compared to pigmented conspecifics [11][12][13][14][15][16]. In experiment II, we used the winner-loser test in which the previous winning experience of an individual strengthens its will to contest and increases the probability of its subsequent victory [45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Pupil size variation as a response to stress in European catfish and its application for social stress detection in albino conspecifics

et al. 2020

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Hormonal changes such as increased cortisol level in blood plasma in response to stress and social environmental stimuli are common among vertebrates including humans and typically accompanied by other physiological processes, such as changes in body pigmentation and/or pupil dilatation. The role of pupil size variation (PSV) as a response to stress have yet to be investigated in fish. We exposed albino and pigmented European catfish to short-term stress and measured changes in pupil size and cortisol level. Albinos showed lower pupil dilatation and higher cortisol levels than did pigmented conspecifics. A clear positive relationship between pupil dilatation and cortisol concentrations was observed for both pigmented and albino specimens, suggesting that PSV can be used as a stress indicator in fish, irrespective of albino’s inability to express social communication by coloring. During the follow-up, we investigated whether a penultimate contest between albino individuals would impact contestants’ social stress during subsequent contact. We observed PSV during the contact of unfamiliar albino catfish with different penultimate experiences (winner (W) and/or loser (L)). Then, the following treatment combinations were tested: WW, WL and LL. Twenty-four-hour contact of two unfamiliar catfish resulted in higher pupil dilatation among individuals with previous winner experience. Among treatment combinations, a WL contest displayed the highest pupil dilatation for winners. PSV reflected socially induced stress in individuals that was accompanied by the “winner” experience and dominancy in albinos. To conclude, the present study validates pupil dilatation as a non-invasive method to evaluate stress level in pigmented as well as albino fish in various contexts.

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Evaluating feeding as unconditioned stimulus for conditioning of an endocrine effect in Nile tilapia

Cited by 9 publications

References 32 publications

Linking Fearfulness and Coping Styles in Fish

Linking Fearfulness and Coping Styles in Fish

Effects of Anesthetic Disposal on the Physiological and Behavioral Responses of the Lined Seahorses, Hippocampus erectus

Pupil size variation as a response to stress in European catfish and its application for social stress detection in albino conspecifics

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