Continuous light (relative to a 12:12 photoperiod) has no effect on anxiety-like behaviour, boldness, and locomotion in coho salmon (Oncorhynchus kisutch) post-smolts in recirculating aquaculture systems at a salinity of either 2.5 or 10 ppt

Hamilton, Trevor J.; Szaszkiewicz, Joshua; Krook, Jeffrey; Richards, Jeffrey G.; Stiller, Kevin Torben; Brauner, Colin J.

doi:10.1016/j.cbpa.2021.111070

Cited by 7 publications

(4 citation statements)

References 64 publications

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“…Surprisingly, the latency to approach the object was equivalent to the controls. The present results differ from those found in coho salmon, where behavior on the OF test was not modified by LL conditions [64]. Species-specific factors may play a role in these discrepancies, as well as the duration of the conditions, which was shorter in our study.…”

Section: Discussioncontrasting

confidence: 99%

“…These two models for chronodisruption have been previously well studied in the same species, causing alterations in locomotor activity, plasma cortisol, and clock gene expression rhythms. These alterations are particularly prominent in the central nervous system, especially under LL conditions, but are also observed in the periphery in randomly fed animals [9,13,[64][65][66][67]. Goldfish exposed to continuous light showed increased anxiety-like behavior.…”

Section: Discussionmentioning

confidence: 95%

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Assessing Chronodisruption Distress in Goldfish: The Importance of Multimodal Approaches

Saiz,

Herrera-Castillo,

de Pedro

et al. 2023

Animals

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Chronodisruption caused by factors such as light at night and mistimed meals has been linked to numerous physiological alterations in vertebrates and may be an anxiogenic factor affecting welfare. This study aims to investigate whether chronodisruption causes measurable changes in the anxiety responses of goldfish under two conditions: randomly scheduled feeding (RF) and continuous light (LL). Anxiety-like behavior was assessed in the open field with object approach and black/white preference tests, which had been validated using diazepam. An increased thigmotaxis response and decreased object exploration under both chronodisruption protocols indicated anxiety states. Furthermore, locomotor activity was increased in LL fish. The black/white preference test discriminated anxiolysis induced by diazepam but was unable to detect anxiety caused by chronodisruption. Plasma cortisol increased in both RF and LL fish throughout the experiment, confirming that both conditions caused stress. The LL fish also showed an apparently desensitized hypothalamus–pituitary–interrenal HPI axis, with a decrease in pomc and crf expression. Individual analysis found no correlation between anxiety-like behavior and stress axis activation nor between scototaxis and thigmotaxis responses. However, individual differences in sensitivity to each test were detected. Altogether, these results highlight circadian disruption as a stressor for fish and endorse a multiple variable approach for reliably assessing animal discomfort.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 95%

Assessing Chronodisruption Distress in Goldfish: The Importance of Multimodal Approaches

Saiz,

Herrera-Castillo,

de Pedro

et al. 2023

Animals

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“…In fish, particularly salmonids such as Atlantic salmon, Salmo salar, it is now common practice to use highly extended day lengths or even L:L to increase growth (Boeuf and Le Bail, 1999) and manipulate maturation (Strand et al, 2018) and reproduction (Wang et al, 2010). While in some species, including Atlantic salmon, these extreme light regimes appear to have no observable behavioral or physiological effects (Fang et al, 2019;Hines et al, 2019;Hamilton et al, 2022), in others such as Coho salmon (Oncorhynchus kisutch) and rainbow trout (Oncorhynchus mykiss), they elicit markers of stress and/or alter immune profiles (Melingen et al, 2002;Leonardi and Klempau, 2003). However, the extent to which manipulation of circadian biology in cultured aquatic species influences disease susceptibilityarguably the greatest challenge to aquaculture (Stentiford et al, 2017(Stentiford et al, , 2022-is largely unknown.…”

Section: Aquaculturementioning

confidence: 99%

One Health: Circadian Medicine Benefits Both Non-human Animals and Humans Alike

Farag,

Murphy,

Templeman

et al. 2024

J Biol Rhythms

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Circadian biology’s impact on human physical health and its role in disease development and progression is widely recognized. The forefront of circadian rhythm research now focuses on translational applications to clinical medicine, aiming to enhance disease diagnosis, prognosis, and treatment responses. However, the field of circadian medicine has predominantly concentrated on human healthcare, neglecting its potential for transformative applications in veterinary medicine, thereby overlooking opportunities to improve non-human animal health and welfare. This review consists of three main sections. The first section focuses on the translational potential of circadian medicine into current industry practices of agricultural animals, with a particular emphasis on horses, broiler chickens, and laying hens. The second section delves into the potential applications of circadian medicine in small animal veterinary care, primarily focusing on our companion animals, namely dogs and cats. The final section explores emerging frontiers in circadian medicine, encompassing aquaculture, veterinary hospital care, and non-human animal welfare and concludes with the integration of One Health principles. In summary, circadian medicine represents a highly promising field of medicine that holds the potential to significantly enhance the clinical care and overall health of all animals, extending its impact beyond human healthcare.

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“…Constant light (LL) has been implemented in commercial production in freshwater recirculation aquaculture systems (RAS) of Atlantic salmon smolts (Lorgen-Ritchie et al, 2022;Ytrestøyl et al, 2022). Several studies have shown that LL does not negatively affect behavior (Hamilton et al, 2022), survival (Nemova et al, 2020), flesh quality (Imsland et al, 2019), and immune gene expression (Ytrestøyl et al, 2022) in salmonids. However, LL exposure is considered a stressor in some fish, such as black sea turbot (Psetta maeotica) (Turker, 2005), Atlantic cod (Gadus morhua) (Giannetto et al, 2014), and largemouth bass (Micropterus salmoides) (Malinovskyi et al, 2022), etc.…”

Section: Introductionmentioning

confidence: 99%

Photoperiod-independent diurnal feeding improved the growth and feed utilization of juvenile rainbow trout (Oncorhynchus mykiss) by inducing food anticipatory activity

Shi

et al. 2022

Front. Mar. Sci.

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A three-month culture experiment was designed to assess the effects of photoperiod and feeding regime on growth, feed utilization, and food anticipatory activity (FAA) of juvenile rainbow trout. The experiment included two photoperiods: 24L:0D (LL) and 12L:12D (LD); three feeding regimes: random feeding (R), mid-dark stage feeding (D), and mid-light stage feeding (L). A total of six treatment groups (R-LL, D-LL, L-LL, R-LD, D-LD, L-LD) were defined. The experimental results showed that the growth and feed utilization of the scheduled feeding groups (D and L groups) were significantly higher than those of the R group under both photoperiods, and there was no statistical difference between the D and L groups. A typical FAA was observed in the L group, independent of the photoperiod. Also, the digestive enzyme activity of the L group was synchronized by the feeding time under both photoperiods. There were rhythms in serum levels of glucose (GLU), triglyceride (TG), and total-cholesterol (T-CHO) in the D and L groups. Serum GLU also had a rhythm in the R group, but the peaks occurred at the feeding point (LL group) or after the feeding point (LD group), reflecting a possible passive rise in GLU after feeding. Serum cortisol was higher in the R group than in the scheduled feeding group, indicating that random feeding caused stress to juvenile rainbow trout. Serum insulin levels were found to increase before feeding in all three feeding regimes, probably reflecting the anticipation of food induced by the last meal. Serum melatonin levels were suppressed by the LL group. Serum 5-HT levels were synchronized by meal time in the R and L groups. Finally, rhythms of appetite-related genes were observed under all three feeding regimes, and more genes were rhythmic under LL, suggesting that food can strongly synchronize the feeding rhythm of juvenile rainbow trout when lacking light zeitgeber. In summary, this study concluded that diurnal feeding (L group) independent of photoperiod induced typical FAA in juvenile rainbow trout and that the LD (12L:12D) photoperiod and L (mid-light phase) feeding were recommended in the juvenile rainbow trout aquaculture.

show abstract

Continuous light (relative to a 12:12 photoperiod) has no effect on anxiety-like behaviour, boldness, and locomotion in coho salmon (Oncorhynchus kisutch) post-smolts in recirculating aquaculture systems at a salinity of either 2.5 or 10 ppt

Cited by 7 publications

References 64 publications

Assessing Chronodisruption Distress in Goldfish: The Importance of Multimodal Approaches

Assessing Chronodisruption Distress in Goldfish: The Importance of Multimodal Approaches

One Health: Circadian Medicine Benefits Both Non-human Animals and Humans Alike

Photoperiod-independent diurnal feeding improved the growth and feed utilization of juvenile rainbow trout (Oncorhynchus mykiss) by inducing food anticipatory activity

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