Influence of the light spectrum on the daily rhythms of stress and humoral innate immune markers in pikeperch Sander lucioperca

Baekelandt, Sébastien; Mandiki, Syaghalirwa N.M.; Schmitz, Mélodie; Kestemont, Patrick

doi:10.1016/j.aquaculture.2018.09.046

Cited by 29 publications

(25 citation statements)

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“…A preference of pike perch for low light intensities and red color are explained by specific adaptations of its retina. It includes a tapetum lucidum , that is, a specific anatomo‐histological tissue of the retina which greatly amplifies the eye sensitivity to light and specific cones absorbing red wavelengths . In the present experiment, the best husbandry performances were obtained with a 10‐lx light supporting previous results while light spectra did not significantly affect growth.…”

Section: Discussionsupporting

confidence: 88%

“…Such day‐night rhythmicity of humoral innate immune variables was already described in several teleosts including gilthead sea bream and sea bass ( Dicentrarchus labrax ) . In a previous study on pike perch, both lysozyme and peroxidase activities were already shown to follow a daily rhythmicity with peaks at 04:00 and drops by a 25%‐40% during the photophase at 10:00 and 16:00 . However, we show for the first time day‐night variations in immune mRNA gene expressions in association to the cyclic release of melatonin in blood, supposing a potential effect of this hormone on the immune system.…”

Section: Discussionmentioning

confidence: 99%

“…On the one hand, spectral content influences food intake, reproduction, growth, and even survival of various fish species . In pike perch, it was described that long‐wavelength light, especially red light compared to white or short‐wavelength lights, improved feeding behavior, feed efficiency, and growth . Considering these data, and because current practices for pike perch rearing are not yet optimized, red and industrial white light spectra were chosen to better evaluate the potential effects of the light spectrum on pike perch physiology.…”

Section: Introductionmentioning

confidence: 99%

“…Few evidences suggest that melatonin may act as an important immune regulator . In pike perch, we have already described daily cyclic activities of several humoral innate immune markers correlated with the light‐dark cycle, but the relation with melatonin secretion was not reported.…”

Section: Introductionmentioning

confidence: 99%

“…10,11 In pike perch, it was described that long-wavelength light, especially red light compared to white or short-wavelength lights, improved feeding behavior, feed efficiency, and growth. 7,9 Considering these data, and because current practices for pike perch rearing are not yet optimized, 8 red and industrial white light spectra were chosen to better evaluate the potential effects of the light spectrum on pike perch physiology. On the other hand, light intensity is described to affect many behavioral and biological processes in fish, such as foraging and growth.…”

Section: Introductionmentioning

confidence: 99%

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Are cortisol and melatonin involved in the immune modulation by the light environment in pike perch Sander lucioperca?

Baekelandt

Mandiki

Kestemont

2019

Journal of Pineal Research

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The pineal gland is the main organ involved in the transduction process converting environmental light information into a melatonin response. Since light environment was described as an important factor that could affect physiology of teleosts, and because melatonin is a crucial hormone regulating numerous physiological processes, we hypothesized that environmental light may act on both stress and circadian axes which in turn could influence the immune status of pike perch. Therefore, we investigated the effects of two light spectra (red and white) and two light intensities (10 and 100 lx) with a constant photoperiod 12L(8:00‐20:00)/12D on pike perch physiological and immune responses. Samples were collected at 04:00 and 16:00 at days 1 and 30 of the experiment. Stress markers, plasma melatonin levels, humoral innate immune markers, and expression of key immune genes in the head kidney were assessed. Light intensity clearly affected pike perch physiology. This included negative growth performances, increase in stress status, decrease in plasma melatonin levels, and immune depression. Light spectrum had only little influences. These results demonstrate that high stress status may have impacted melatonin production and secretion by the pineal organ. The drop in circulating melatonin and the increase in stress status may both be involved in the immune suppression.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%