Publication: Effect of Light–Dark Cycle on Skin Mucosal Immune Activities of Gilthead Seabream (Sparus aurata) and
European Sea Bass (Dicentrarchus labrax)
Authors
Ceballos-Francisco, Diana ; Cuesta Peñafiel, Alberto ; Esteban Abad, María de los Ángeles
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Publisher
MDPI
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DOI
doi:10.3390/fishes5010010
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info:eu-repo/semantics/article
Description
Abstract
Changes in di erent immune activities in the skin mucus of gilthead seabream (Sparus aurata
L.) and European sea bass (Dicentrarchus labrax L.) specimens exposed to a constant light–dark
photoperiod (12 h L:12 h D) were studied. Samples were collected at 08:00 (light on), 14:00, 20:00 (light
o ), 02:00, and again at 08:00 to determine immunoglobulin M (IgM) levels, several enzymes related
to the immune system, and bactericidal activity. IgM levels were higher during the day in seabream
and reached a minimum value at 20:00, but it was hardly a ected in sea bass. No significant variations
were recorded in the levels of protease and antiprotease. Peroxidase reached its maximum level in
seabream at 02:00, the same time that it reached its minimum level in sea bass. Lysozyme showed little
variation in seabream, but it was significantly lower at 14:00 than during the rest of the cycle in sea bass.
Finally, di erent interspecific variations on bactericidal activity against Vibrio harveyi were recorded.
The findings demonstrate that the immune parameters present in skin mucus of these important fish
species are a ected by the light–dark cycle and that there are substantial interspecies di erences.
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Citation
Fishes, 2020, 5, 10;
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