The effect of timing of extended photoperiod on growth and maturity of brook trout (
            <i>Salvelinus fontinalis</i>
            )

Lundova, Katsiaryna; Matoušek, Jan; Prokešová, Markéta; Sebesta, Roman; Policar, T.; Stejskal, Vlastimil

doi:10.1111/are.14053

Cited by 15 publications

(6 citation statements)

References 29 publications

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“…Thus, the effects of photoperiod may vary depending on the physiological conditions of the concerned species and its habitat. GSI is an important index used to evaluate the maturity of fishes, HSI is often used as an indirect indicator of the energy state of animals, and CF indicates the fatness and growth of fishes (Garcia‐Lopez et al ., 2007; Lundova et al ., 2019). The results showed that GSI and HSI showed consistent changes and were higher in the long photoperiod group than in the other two groups, whereas CF was lower; this suggested that the energy might change in fish body began to change from the increase of individual body weight to the process of energy storage and gonadal development.…”

Section: Discussionmentioning

confidence: 99%

Effects of different photoperiods on growth and ovarian development and maturation of silver pomfret Pampus argenteus

Wang

et al. 2023

Journal of Fish Biology

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Photoperiod has a great influence on the growth and ovarian development and maturation of fishes. To analyse the effects of photoperiod on growth and ovarian development of an important marine economic fish, silver pomfret Pampus argenteus, short photoperiod group (L:D = 8:16), control group (L:D = 12:12) and long photoperiod group (L:D = 18:6) were set up for 60 days. The growth performance, ovarian development, changes in hormones and key enzyme activities in the hypothalamic-pitui-taryÀgonadal (HPG) axis and expressions of key regulatory genes in the HPG axis were studied under different photoperiod conditions. The results showed that the final weight gain, body weight index, specific growth rate for weight, specific growth rate for length and average daily growth were the highest in the long photoperiod group, and the feed conversion rate was the lowest. Under long photoperiod condition, gonado-somatic index and hepato-somatic index were higher, ovarian maturity was better and expressions of HPG axisÀrelated regulatory genes foxl2a, foxl2b, cyp19a1a, cyp19a1b, kiss, gpr54-2, gnrh2, fsh and lh were higher. When compared with the other two groups, in the long photoperiod group, the change trend of estradiol (E2) was consistent with those of luteinizing hormone, melatonin (MT) and kisspeptin, and the levels were higher on the 20th and 50th days. These results indicate that prolongation of the photoperiod can improve the growth performance of P. argenteus and promote ovary development and maturation. The authors speculate that photoperiod may regulate the ovarian activity of P. argenteus through MT and kisspeptin/gpr54 signalling pathways. The results show that photoperiod can regulate the ovarian development of P. argenteus, which would help in breaking the seasonal restrictions of animals and regulating an animal's reproductive cycle.

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Section: Discussionmentioning

confidence: 99%

Effects of different photoperiods on growth and ovarian development and maturation of silver pomfret Pampus argenteus

Wang

et al. 2023

Journal of Fish Biology

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“…Analyses were carried out at Stafila laboratory, České Budějovice, Czech Republic. Male and female fish data were analyzed separately [ 11 ].…”

Section: Methodsmentioning

confidence: 99%

“…Despite the success in developing rearing technologies and the growing market interest, early sexual maturation is a major problem in the on-growing industry. Precocious maturation has a negative impact on the growth rate—mature individuals invest heavily in the development of gonads and show negative growth performance [ 10 , 11 ], the immune system—by inability of producing isohemagglutinins, which can leads to the reduction of bactericidal activity [ 12 ], and product quality—softer fillets with reduced fat and low slaughter yield [ 13 ]. In early puberty, fish show a high growth potential, a factor increasing profitability in the farming industry [ 14 ], but somatic weight subsequently stabilizes or decreases, as resources are diverted to gonad formation and gamete production [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Non-Circadian Photoperiod on Growth and Puberty Onset of Brook Trout Salvelinus fontinalis Mitchill

Lundova

Matoušek

Stejskal

2021

Animals

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The aim of the present study was to assess the effects of a prolonged photoperiod on growth rate and sexual maturation in brook trout Salvelinus fontinalis. The task of the experiment was to determine the most effective light regimen capable to minimizing the effects of puberty, including impairment of somatic growth and further general characteristics. In this regard, the studied fish were reared under three photoperiod regimens in which fish were exposed to 24 h continuous light alternating with 24 or 48 h under the ambient photoperiod or 48 h continuous light alternating with a 24 h ambient photoperiod. A control group was reared under the natural ambient photoperiod. Four-hundred and fifty fish with an average initial body weight of 101.3 ± 1.2 g were used for each experimental group (three replicates of each treatment plus control). A statistically lower growth rate showed control groups in both sexes. At the end of the study, control males had an average body weight of 226.6 ± 39.8 g and control females a body weight of 199.8 ± 12.2 g. At the same period, a significantly higher average body weight was found in groups reared 24 h under ambient photoperiod alternating with a 48 h continuous light regime (2CP:1AP) in both sexes (296.56 ± 62.5 g—males, and 239.9 ± 19.2 g—females, respectively). A significantly higher percentage of sexually mature fish was observed in the control group (80% of males and 29% of females, respectively). We found significantly fewer sexually mature females compared to males. The lowest survival was observed in group 2CP:1AP at 92%. It was concluded that regimen under which fish was exposed to 48 h of natural ambient photoperiod alternating with 24 h of constant light (1CP:2AP) lead to the successful delay of gonad development and onset of puberty and increased somatic growth in both sexes.

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“…Aquaculture has widely used photoperiod manipulation to improve productivity (Imsland et al, 2020;Ruchin, 2021). It has been observed in most intensively farmed fish that extended light periods promote somatic growth (Boeuf and Le Bail, 1999;Aride et al, 2021;Li et al, 2022), while extended darkness periods promote gonadal development and maturation (Hermelink et al, 2017;Lundova et al, 2019). 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).…”

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.

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The effect of timing of extended photoperiod on growth and maturity of brook trout ( Salvelinus fontinalis )

Cited by 15 publications

References 29 publications

Effects of different photoperiods on growth and ovarian development and maturation of silver pomfret Pampus argenteus

Effects of different photoperiods on growth and ovarian development and maturation of silver pomfret Pampus argenteus

The Effect of Non-Circadian Photoperiod on Growth and Puberty Onset of Brook Trout Salvelinus fontinalis Mitchill

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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