Photoperiod may regulate growth via leptin receptor A1 in the hypothalamus and saccus vasculosus of Atlantic salmon (Salmo salar)

Photoperiod is believed to regulate growth in fish, although the mechanism involved is still unclear. In this paper, we report a relationship between leptin-receptor A1 (AsLRa1), melatonin-receptor (AsMR) and photoperiod in Atlantic salmon. Atlantic salmon (mean weight 1071.70 +/- 155.54 g) were rea...

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Bibliographic Details
Published in:Animal Cells and Systems
Main Authors: Chi, Liang, Li, Xian, Liu, Qinghua, Liu, Ying
Format: Report
Language:English
Published: TAYLOR & FRANCIS LTD 2019
Subjects:
Photoperiod
leptin receptor
growth
Atlantic salmon
Cell Biology
Zoology
SEASONAL PATTERNS
FOOD-INTAKE
EXPRESSION
LIGHT
MELATONIN
SECRETION
IDENTIFICATION
METABOLISM
MATURATION
PROLACTIN
Salmo salar
Online Access:http://ir.qdio.ac.cn/handle/337002/162872
https://doi.org/10.1080/19768354.2019.1595138
Description
Summary:Photoperiod is believed to regulate growth in fish, although the mechanism involved is still unclear. In this paper, we report a relationship between leptin-receptor A1 (AsLRa1), melatonin-receptor (AsMR) and photoperiod in Atlantic salmon. Atlantic salmon (mean weight 1071.70 +/- 155.54 g) were reared under six photoperiod regimes, four constant light regimes 24L:0D, 18L:6D, 12L:12D and 8L:16D, hours of light (L) and dark (D) and two varying light regimes, LL-SL = 24L:0D-8L:16D, and SL-LL = 8L:16D-24L:0D over a period of seven months. The results showed that AsLRa1 transcripts were mainly existed in the hypothalamus and saccus vasculosus (SV), AsMR was mainly expressed in the hypothalamus. Long photoperiod inhibited the expression of AsLRa1 and AsMR transcripts in the Atlantic salmon brain. The expression pattern of AsLRa1 was similar to the expression pattern of AsMR in the hypothalamus. Food intake was higher in fish with lower AsLRa1 transcript levels. This demonstrated that photoperiod influenced somatic growth by changing expression of AsLRa1 in the hypothalamus and SV to affect appetite. In addition, we found that the SV appears to act as a seasonal sensor regulating reproduction in a similar way to the hypothalamus.

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