Capacités adaptatives du turbot (Psetta maxima) juvénile à la photopériode

Pichavant, K.; Ruyet, J. Person‐Le; Sévère, Armelle; Roux, A. Le; Quéméner, Loïc; Bœuf, Gilles

doi:10.1051/kmae:1998004

Cited by 13 publications

(11 citation statements)

References 20 publications

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“…In the present study, relative growth rate of fish in the continuous light group was significantly higher than those in the shorter photoperiod groups however, feed intake was similar in all three groups and did not differ significantly, showing that the positive effects of increased light on weight gain of fish are achieved by increased feed conversion rate rather than stimulation of feeding (Woiwode and Adelman 1991). Similar to our findings, Pichavant et al (1998) found no differences in feed intake of turbot exposed to different photoperiod regimes. Adversely, reported higher feed intake in turbot held under 20L:4D photoperiod when compared to those maintained at 8L:16D or 12L:12D light regimes.…”

Section: Resultssupporting

confidence: 85%

INFLUENCE OF INCREASED PHOTOPERIODS ON GROWTH, FEED CONSUMPTION AND SURVIVAL OF JUVENILE MIRROR CARP (Cyprinus carpio Linnaeus, 1758)

Yt¹

2009

JFS.com

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A growth trial was conducted in order to determine the effects of increased photoperiod regimes on growth performance, feed intake and survival of mirror carp (Cyprinus carpio Linnaeus, 1758) in laboratory conditions for 90 days. Triplicate groups of fish (6 g mean body weight) were exposed to photoperiod regimes of 12 hours light:12 hours dark (12L:12D), increased photoperiods of 16 hours light:8 hours dark (16L:8D) and continuous light (24L:0D), respectively. At the end of the trial, growth was highest in the group subjected to continuous photoperiod, and appeared significantly different (p<0.05) than the rates recorded in the other photoperiod regimes. Under the continuous (24L:0D) photoperiod, feed conversion ratio (FCR) was significantly (p<0.05) better than those in the other photoperiod treatments. No significant difference (p>0.05) was found in the FCRs between the 12L:12D and 16L:8D groups. Feed intake was not significantly (p>0.05) affected by photoperiod treatments. No mortality was observed in the continuous (24L:0D) photoperiod group, however, a mortality of about 3 % was recorded in the other two groups. For a better growth and lower food conversion rate, a continuous (24L:0D) photoperiod exposure is suggested best for rearing of juvenile carp. The financial support by the first author was received from the Scientific Research Project Commission (BAP commission -M.Sc. project number: 2005/110) of COMU. Journal of FisheriesSciences.com Danışman-Yağcı and Yiğit, 3(2): 146-152 (2009)

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Section: Resultssupporting

confidence: 85%

INFLUENCE OF INCREASED PHOTOPERIODS ON GROWTH, FEED CONSUMPTION AND SURVIVAL OF JUVENILE MIRROR CARP (Cyprinus carpio Linnaeus, 1758)

Yt¹

2009

JFS.com

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“…The 24L:0D treatment reduced the fat content, consistent with the hypothesis of greater activity metabolism under long days. In previous photoperiod experiments using turbot, Pichavant, Person‐Le Ruyet, Severe, Le Roux, Quemener and Boeuf (1998) did not find variation in body composition, possibly because their experimental period (2 months) was much shorter and final weight (90 g) much lower.…”

Section: Discussionmentioning

confidence: 72%

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

et al. 2004

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Immature gilthead sea bream (Sparus aurata L.) with a mean initial weight of 25.6 g were reared over 11 months to market size under di¡erent photoperiods: 16L:8D; 24L:0D and a control. Di¡erences in ¢nal mean weight were signi¢cant between the three treatments (Po0.001): 16L:8D, 465.0 g; 24L:0D, 445.9 g; control, 402.6 g. Fish from the 24L:0D consumed most while 16L:8D ¢sh converted it most e⁄ciently. The lipid content of ¢llets was lower (Po0.05) for the 24L:0D (5.37 AE 0.16 g100 g À1 of ¢llet) than for the control (6.02 AE 0.12 g), and the moisture content lower for the control than for either treatment groups. Skin luminosity (L Ã ) was directly related to the number of hours of light exposure.

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“…Somatotropin synthesis was depressed in hypoxia (3·5 and 5 mg l 1 ) in one experiment Pichavant et al, 1999). In another experiment, in which turbot were kept under six different photoperiods (Pichavant et al, 1998), no differences in GH levels were observed. The influence of elevated ammonia was investigated by exposing fish to a range of ammonia concentrations, over a period of 3 months.…”

Section: Somatotropic Axismentioning

confidence: 91%

“…Many such factors can exert a considerable effect on fish growth, but only those having a major effect will be discussed here. The substance of this discussion is taken from published studies conducted at Ifremer Brest, including the effects of temperature (Burel et al, 1996), salinity (Gaumet et al, 1994(Gaumet et al, , 1995 and photoperiod (Pichavant et al, 1998). All experiments led to satisfactory growth rates, high survival and low food conversion (<0·9).…”

Section: Determining Factorsmentioning

confidence: 99%

“…In older fish, photoperiod appears to have much more impact on growth than the intensity or spectrum of illumination . The influence of exposing the turbot to constant and changing photoperiods for several months has been investigated by several authors (Imsland et al, 1995a(Imsland et al, ,b, 1997bPichavant et al, 1998), but turbot, in common with other flatfish, seems to be less receptive than Atlantic salmon, when feeding is unrestricted . Imsland et al (1995aImsland et al ( ,b, 1997b found a slight effect on growth for 5-125-g turbot after 6 months of exposure to long photoperiod (16L : 8D and 24L : 0D), but no such effect was observed in a shorter-term experiment (Pichavant et al, 1998).…”

Section: Determining Factorsmentioning

confidence: 99%

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Control of the somatic growth in turbot

Bœuf

Boujard

Ruyet

1999

Journal of Fish Biology

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The development of a recombinant turbot somatotropin (rtuGH) in Escherichia coli and an homologous antibody in rabbit has produced a sensitive and specific RIA allowing the measurement of blood levels and pituitary contents of tuGH and their responses to environmental change. Turbot IGF-1 (insulin growth factors) and IGF type 1 receptor (R) cDNA have also been cloned and sequenced. The deduced IGF-1 R primary sequence contains all the topological features characteristics of mammalian IGF-1 R and the turbot R appears highly conserved, compared to its mammalian counterpart, particularly within the catalytic domain. IGF-1 R mRNA polyadenylation status varies during development with polyadenylation occuring in oocytes and early stage larvae. It disappears in later stages and in adult somatic tissues, indicating that IGF-1 R mRNA undergoes complex post-transcriptional regulation. Thyroid hormones (TH, both T 3 and T 4 ), are also involved in growth control, but are less affected by environmental changes than GH, except in very extreme conditions. The thyroid stimulating hormone (TSH) -subunit cDNA fragment has also been cloned and sequenced. mRNA expression levels have been quantified under conditions where blood circulating TH were modified by dietary treatments or hormone supplementation. Specific growth rate in turbot is related to food intake and is doubled with a temperature increase from 8 to 20 C. Lipid storage by contrast was higher at low temperatures. Over a long time course, growth rate in turbot can be improved in brackish water (8-20 psu) but it cannot adapt to very low salinities. Photoperiod appears to have little influence on growth when feeding is unrestricted. Under intensive farming conditions, ammonia, the major nitrogen waste product in teleosts, may increase to levels that can reduce growth. Safe ambient levels for growth are <2-3 mg l 1 TAN above which a 10-20% decrease in growth was recorded within 3 months. Over 20 mg l 1 , feeding stops and no growth occurs. Turbot juveniles can cope efficiently with relatively large fluctuations in ambient oxygen, but major disruptions to physiological functions occur below 20% of air saturation. Under moderate hypoxia growth is reduced by 20% within 1·5 months. The primary response to hypoxia or ammonia accumulation is always a decrease of food intake. 1999 The Fisheries Society of the British Isles

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Capacités adaptatives du turbot (Psetta maxima) juvénile à la photopériode

Cited by 13 publications

References 20 publications

INFLUENCE OF INCREASED PHOTOPERIODS ON GROWTH, FEED CONSUMPTION AND SURVIVAL OF JUVENILE MIRROR CARP (Cyprinus carpio Linnaeus, 1758)

INFLUENCE OF INCREASED PHOTOPERIODS ON GROWTH, FEED CONSUMPTION AND SURVIVAL OF JUVENILE MIRROR CARP (Cyprinus carpio Linnaeus, 1758)

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

Control of the somatic growth in turbot

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