The effects of long-day photoperiod on growth, body composition and skin colour in immature gilthead sea bream (Sparus aurata L.)

Ginés, R.; Afonso, Juan Manuel; Argüello, A.; Zamorano, M. J.; López, José González

doi:10.1111/j.1365-2109.2004.01126.x

Cited by 88 publications

(63 citation statements)

References 25 publications

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“…The finding that higher growth accompanied with both higher feed intake and feed efficiency under long and continuous photoperiods parallels the findings in other species, such as haddock, Melanogrammus aeglefinus (Trippel and Neil, 2003) and gilthead seabream, Sparus aurata (Kissil et al, 2001;Ginés et al, 2004).…”

Section: Discussionsupporting

confidence: 69%

Effects of Photoperiod Manipulation on Growth Performance and Hematological Responses of Juvenile Caspian Roach Rutilus rutilus caspicus

Shahkar¹,

Kim²,

Mohseni³

et al. 2015

Fisheries and aquatic sciences

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A 8-week trial was conducted to evaluate the effects of photoperiod manipulation on the growth performance and hematological parameters of juvenile Caspian roach, Rutilus rutilus caspicus (average weight 1.46 ± 0.12 g mean±SD) reared under five photoperiods (24 h Light, 24L; 18 h Light & 6 h Dark, 18L:6D; 12 h Light & 12 h Dark, 12L:12D; 6 h Light & 18 h Dark, 6L:18D; 24 h Dark, 24D) with constant light intensity 1,500 lx on the water surface. Triplicate of 20 fish were allocated into each of 15 fiberglass tanks of 50 L capacity and they were fed three times per day with the commercial feed (SFK, Co., Sari -Iran) contains 50.0% protein and 10.5% lipid. At the end of experimental period, final body weight, weight gain and specific growth rates of fish exposed to 24L were significantly higher than those of fish exposed to 12L:12D, 6L:18D and 24D (P < 0.05). Red blood cell and hemoglobin of fish exposed to 24L were significantly higher than those of fish exposed to 24D. No significant difference observed in hematocrit, white blood cell and plasma glucose among the different treatments groups. Therefore, these results demonstrated that the growth performance of juvenile Caspian roach can be significantly stimulated by using 24L and 18L:6D photoperiods without any measurable significant stress response such as plasma glucose concentration.

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Section: Discussionsupporting

confidence: 69%

Effects of Photoperiod Manipulation on Growth Performance and Hematological Responses of Juvenile Caspian Roach Rutilus rutilus caspicus

Shahkar¹,

Kim²,

Mohseni³

et al. 2015

Fisheries and aquatic sciences

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“…In this case, the fish possibly had the highest appetite, as demonstrated by Biswas et al (2005Biswas et al ( , 2006. As described in a review by Boeuf & Bail (1999), Gross et al (1965) were the first to demonstrate that growth is influenced by photoperiod by not only stimulating consumption, but also by improving the feed conversion ratio. Biswas et al (2005Biswas et al ( , 2006 showed that long intervals between feeding fish during a long and constant photoperiod might allow for more efficient digestion, which probably improved nutrient retention.…”

Section: Resultsmentioning

confidence: 91%

“…For some species, long photoperiods might indirectly modify growth by eliciting an increased feed intake, developing muscle mass through increased locomotor activity (Boeuf & Bail, 1999), enhancing nutrient use efficiency (Biswas et al, 2006) and/or redirecting energy from gonadal development into somatic growth (Boeuf & Bail, 1999;Ginés et al, 2004;Rad et al, 2006). However, the effect of photoperiod on somatic growth and sexual maturation has been little studied during the early stages of fish development (Rad et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Effect of photoperiod on locomotor activity, growth, feed efficiency and gonadal development of Nile tilapia

et al. 2013

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-The objective of this study was to evaluate the effect of photoperiod on locomotor activity, growth and gonadal development in Nile tilapia (Oreochromis niloticus) fingerlings. A completely randomised design was used, with five treatments (0L:24D, 6L:18D, 12L:12D, 18L:6D and 24L:0D) and four replicates, with the aquarium as the experimental unit. One hundred and sixty fingerlings of tilapia weighing 3.21±0.05 g and measuring 4.35±0.07 cm each were distributed among 20 aquaria of 20 L in a recirculation system with the temperature controlled to 27 °C, with eight fish per aquarium. Feeding was carried out twice daily for 75 days, with extruded feed containing 40% crude protein. The fingerlings subjected to a photoperiod of 12L:12D as well as those under 18L:6D and 24L:0D showed the greatest locomotor activity, whereas those under 6L:18D and 0L:24D showed the lowest activity. Fish subjected to a photoperiod of 18L:6D and 24L:0D showed the highest levels of performance. However, manipulation of the photoperiod did not influence the gonadal development, survival or the appearance of deformities in juvenile Nile tilapia. Under long photoperiods (18L:6D and 24L:0D), fish direct their energy to somatic growth and induce best feed efficiency.

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“…Contrasting these results, several studies pointed out the interference of photoperiod on reproductive variables. Studies on photoperiods and long light regimes tend to promote a continuous suppression of gonadal maturation and to redirect the gonadal development of food energy to somatic growth (Ginés et al, 2004). Rad et al (2006) found that Nile tilapia, kept under continuous light, had a reduced gonadal maturation and lowered values of GSI, followed by increased somatic growth.…”

Section: Resultsmentioning

confidence: 99%

Plasma levels of luteinizing hormone and gonadal maturation of lambari females under different photoperiods

Keley

Pereira

Navarro

et al. 2013

Pesq. agropec. bras.

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-The objective of this work was to evaluate the effect of photoperiod on luteinizing hormone (LH) plasma levels and gonadal maturation of lambari females. One hundred and twenty adult lambaris, distributed into 12 aquaria of 20 L each, were randomly subjected to three different treatments, in a completely randomized design, and four replicates. Treatments were photoperiods in hours of light (L) and darkness (D): T1, 0 L:24 D; T2, 12 L:12 D; T3, 24 L:0 D. After 40 days, fish were subjected to fasting for 24 hours and, then, anesthetized. Immediately after slaughter, fish were weighed, and their gonads and livers were removed and weighed. Ovaries were weighed and immersed in Bouin's fixative solution for 24 hours and, then, kept in 70% alcohol until processing the material. Subsequently, the oocyte developmental stage was determined. No significant differences were observed between treatments for final weight, ovary weight, gonadosomatic index (GSI), hepatosomatic index (HSI) and LH levels. In all treatments, lambari females showed maturing ovaries with prevalence of vitellogenic oocytes. Photoperiod does not affect the LH levels and ovarian maturation in lambari females.Index terms: Astyanax bimaculatus, native species, gonadosomatic index, hepatosomatic index, oogenesis. Níveis plasmáticos de hormônio luteinizante e maturação gonadal de fêmeas de lambari sob diferentes fotoperíodos

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The effects of long-day photoperiod on growth, body composition and skin colour in immature gilthead sea bream (Sparus aurata L.)

Cited by 88 publications

References 25 publications

Effects of Photoperiod Manipulation on Growth Performance and Hematological Responses of Juvenile Caspian Roach Rutilus rutilus caspicus

Effects of Photoperiod Manipulation on Growth Performance and Hematological Responses of Juvenile Caspian Roach Rutilus rutilus caspicus

Effect of photoperiod on locomotor activity, growth, feed efficiency and gonadal development of Nile tilapia

Plasma levels of luteinizing hormone and gonadal maturation of lambari females under different photoperiods

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