Mechanisms underlying photoperiodic effects on age at sexual maturity in Atlantic salmon, Salmo salar

Taranger, Geir Lasse; Haux, Carl; Hansen, Tom; Stefansson, Sigurd O.; Björnsson, Björn Thrándur; Walther, Bernt T.; Kryvi, Harald

doi:10.1016/s0044-8486(99)00068-x

Cited by 108 publications

(84 citation statements)

References 19 publications

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“…These results are in agreement with previous studies showing that sexual maturation under continuous light conditions for a few months is enhanced through a significant increase in sex hormones and the number of oocytes and developing oocytes in Atlantic salmon (Salmo salar) (Taranger et al 1999), Atlantic cod (Hansen et al 1995), and rainbow trout (Duston & Bromage 1986). Also, several previous studies have shown that long photoperiods stimulate reproduction in the goldfish and golden shiner (e.g.…”

Section: Discussionsupporting

confidence: 93%

Effects of various photoperiods on Kisspeptin and reproductive hormones in the goldfish,Carassius auratus

Shin

Song

Choi

et al. 2014

Animal Cells and Systems

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The study aimed to test differences in the hormones of the hypothalamus-pituitary-gonad axis, Kisspeptin (Kiss) and sex steroids, and the sexual maturation of goldfish (Carassius auratus) according to various photoperiods: 10 h light (L):14 h dark (D) (short day), 12L:12D (control), and 14L:10D (long day). To investigate the sexual maturation under various photoperiods, quantitative real-time PCR (QPCR) assays for salmon gonadotropin-releasing hormone, chicken gonadotropinreleasing hormone, gonadotropin hormones (GTHs), Kisspeptin 1 (Kiss1), and its receptor, G protein-coupled receptor 54 (GPR54), were developed. mRNA expression was monitored in cultured pituitary cells (in vitro) of various photoperiod groups. Furthermore, we injected or treated the animals with Kiss and found that Kiss treatment increases the mRNA expression levels of GTHs. We measured the plasma follicle-stimulating hormone (FSH), luteinizing hormone (LH), and 17α-hydroxypregnenolone levels. The gonadotropin-releasing hormones (GnRHs), GTHs, Kiss1/GPR54 mRNA expression, plasma FSH, LH, and 17α-hydroxypregnenolone levels in the 14L:10D group were significantly higher than in the other groups. These results suggest that light length regulates sex maturation by GnRH and Kiss1 in the brain of the goldfish.

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Section: Discussionsupporting

confidence: 93%

Effects of various photoperiods on Kisspeptin and reproductive hormones in the goldfish,Carassius auratus

Shin

Song

Choi

et al. 2014

Animal Cells and Systems

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“…Our results showed a significant growth enhancing effect of exposure to 24L:0D and 18L:6D regimes in rainbow trout, Oncorhynchus mykiss. The data obtained from this experiment is consistent with that from other experiments on juvenile and adult salmons (Endal et al, 2000;Oppedal et al, 1997;Porter et al, 1999;Sigholt et al, 1997;Taranger et al, 1999).…”

Section: Discussionsupporting

confidence: 90%

Untitled

Türker¹,

Yıldırım²

2011

Turk. J. Fish. Aquat. Sci.

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Juvenile of rainbow trout (Oncorhynchus mykiss, weight 27.39±0.16 g) were reared under four photoperiods (Light/Dark hour) (11L:13D control group; 24L:0D continuous light group; 18L:6D extended light group and 6L:18D short light group) to examine their growth performance and some feeding parameters in sea water conditions. Fish were fed on a commercial diet until satiation for 8 weeks of the trial. Fish exposed to 24L:0D (continuous light group) had a significantly higher daily growth rate, relative growth rate and specific growth rates followed by 18L:6D, 11L:13D and 6L:18D photoperiods (P<0.05). The results demonstrated that the growth performance and feed utilization of rainbow trout can be stimulated clearly by using a continuous (24L:0D) or extended light (18L:6D) photoperiods in sea water.

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“…The early period of reduced daylength may initiate reproductive development or phase shift the reproductive cycle (Duston and Bromage, 1986). It has been shown that photoperiod manipulation (Porter et al, 1999;Taranger et al, 1999) and feeding restriction (Rowe and Thorpe, 1990a;Berglund, 1995;Hopkins and Unwin, 1997) at seasonally critical times, can suppress maturation with springtime being suggested as the critical period (Rowe and Thorpe, 1990a;Berglund, 1995;Taranger et al, 1999). However, this implies that the developmental choice to mature has already been taken and it may be that it is not the timing that is as important as the developmental stage of the fish.…”

Section: Discussionmentioning

confidence: 99%

Photoperiodic effects on precocious maturation, growth and smoltification in Atlantic salmon, Salmo salar

Berrill

Porter

Smart³

et al. 2003

Aquaculture

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Current Atlantic salmon farming practice induces early smoltification with artificial photoperiod regimes, however the importance of these photoperiods on parr maturation and interactions with smoltification are poorly understood. These questions were addressed in the present investigation, which examined the effects of photoperiod manipulation on the development, maturation and smoltification of individually tagged parr.

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Mechanisms underlying photoperiodic effects on age at sexual maturity in Atlantic salmon, Salmo salar

Cited by 108 publications

References 19 publications

Effects of various photoperiods on Kisspeptin and reproductive hormones in the goldfish,Carassius auratus

Effects of various photoperiods on Kisspeptin and reproductive hormones in the goldfish,Carassius auratus

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Photoperiodic effects on precocious maturation, growth and smoltification in Atlantic salmon, Salmo salar

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