Effects of exposure to extended photoperiods during the first winter on long-term growth and age at first maturity in turbot (Scophthalmus maximus)

Imsland, Albert K.; Folkvord, Arild; Jónsdóttir, Ólöf Dóra Bartels; Stefansson, Sigurd O.

doi:10.1016/s0044-8486(97)00152-x

Cited by 79 publications

(38 citation statements)

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“…However, since the fish came from three different farms, originating from three different strains, hatched at different times and fed with three different feeds, there is an underlying uncertainty whether changes could be explained from genetics and rearing conditions, rather than season. Turbot, like most other farmed species from the temperate zone, grows according to photoperiod, temperature, sex and maturation (Imsland et al 1995(Imsland et al , 1997(Imsland et al , 2003. As illustrated in Figs.…”

Section: Discussionmentioning

confidence: 99%

The influence of anaerobic muscle activity, maturation and season on the flesh quality of farmed turbot

et al. 2009

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In order to test seasonal, rearing, maturing and anaerobic muscle activity effect on the flesh quality of turbot (Scophthalmus maximus) a total of 80 farmed turbot from three different strains from reared under natural or continuous light were killed by a percussive blow to the head in November (winter, Icelandic strain), March (spring, Portuguese strain) and June (summer, domesticated strain (France turbot)). To test the effect of anaerobic muscle activity, 10 fish were on each occasion pre rigor filleted, where one fillet was used as a control, while the other fillet was electrically stimulated using a squared 5 Hz, 10 V pulsed DC for 3 min. All pre rigor fillets were measured for pH, weighed, wrapped in aluminum foil and stored in polystyrene boxes with ice. After 7 days of storage the fillets were measured instrumentally for pH, drip loss, colour (CIE L* a* b*) and texture properties such as hardness and shear force, while fillet shrinkage and colour (RBG) were evaluated with computer imaging on photographs from a standard lightbox. Results showed that softness of the flesh was mainly influenced by factors associated with growth, such as season, photoperiod and maturation. Anaerobic muscle activity simulated with electrical stimulation caused an increase in drip loss (\1%) and loss of shear force 123Aquacult Int (2010( ) 18:461-474 DOI 10.1007 (\4%), but had no effect on hardness or fillet shrinkage. Computer imaging revealed that muscle contractions related to the electrical stimulus forced out blood from the fillet causing less reddishness for the entire storage period. We conclude that a pH drop upon slaughter associated with anaerobic muscle activity has a minor effect on the flesh quality in the short run, while seasonal/alternatively genetic effects are predominant.

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Section: Discussionmentioning

confidence: 99%

The influence of anaerobic muscle activity, maturation and season on the flesh quality of farmed turbot

et al. 2009

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“…It has been suggested that the continuous photoperiod improves growth only during the first three months after hatching on juvenile turbot, Scophthalmus maximus (Imsland et al, 1995). In another experiment took 18 months, it has been determined that turbot practiced extended photoperiod during the first winter pointed a more extended growth (Imsland et al, 1997). In another study produced for the purpose of encourage the growth of rainbow trout in sea water with extended photoperiod, it has been demonstrated that the trout 20L:4D showed a better growth performance and feed conversion rate (Turker, 2009).…”

Section: Discussionmentioning

confidence: 99%

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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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“…Sobre esta base conceptual, los estímulos ambientales como temperatura (Imsland et al, 1997a), y fotoperíodo (Fores et al, 1990;Imsland et al, 1997b), se controlarían en la escala de mediano plazo y de corto plazo. En cambio el oxígeno, tendría un control en una escala de largo plazo (Pauly, 1984b;Imsland, 1999;Herrmann & Enders, 2000, Kolding et al, 2008.…”

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Estimacion de la talla media de madurez sexual en Trachurus murphyi mediante

Cubillos¹,

Alarcón²

2010

LAJAR

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RESUMEN.Se usa un método alternativo para estimar la talla de madurez del jurel, que considera el consumo relativo de oxígeno en función del peso corporal y la constancia que ocurre en peces teleósteos entre el consumo relativo de oxígeno en la madurez y el tamaño asintótico. La varianza de la estimación se evaluó por el método de Monte Carlo, considerando la incertidumbre en los parámetros de la relación longitud-peso y del consumo relativo de oxígeno. La talla de madurez fue estimada en 25,5 cm de longitud horquilla (17,7-31,3 cm), y fue similar a las estimaciones disponibles obtenidas mediante análisis histológico de hembras maduras. El método se aplicó a otras especies para demostrar su utilidad en la estimación de la talla de madurez sexual en peces. Palabras clave: talla de madurez sexual, consumo de oxígeno, relación longitud-peso, jurel, hipótesis de Pauly (1984), Chile.Estimation of size at first maturity for Trachurus murphyi using relative oxygen consumptionABSTRACT. An alternative method was used to estimate size at maturity for jack mackerel. This method considers relative oxygen consumption as a function of body weight and the consistency of relative oxygen consumption at the size at first maturity and at the asymptotic size in teleosts. Variance in the estimation was evaluated with the Monte Carlo method and considering the uncertainty in the parameters of the length-weight relationship and relative oxygen consumption. Size at first maturity was estimated to be 25.5 cm fork length (17.7-31.3 cm), which was similar to other estimates made using histological analyses of mature females. The method was applied to other species with the objective of demonstrating its usefulness for estimating size at first maturity in fishes. Keywords: size at maturity, oxygen consumption, length-weight relationship, jack mackerel, Pauly's hypothesis (1984), Chile. ________________________Corresponding author: Luis Cubillos (lucubillos@udec.cl) INTRODUCCIÓNLa talla de madurez sexual constituye uno de los parámetros reproductivos básicos en el análisis de pesquerías y evaluación de stock, ya que determina la ojiva de madurez que permite separar la fracción madura de un stock de peces. En términos convencionales, la talla de madurez se determina a través del índice gonadosomático o examen macro y/o microscópico de las gónadas, clasificando los peces maduros en función de las características morfohistológicas funcionales o estructurales (Oliva et al., 1982). En el caso del jurel, Trachurus murphyi, varias son las razones que impiden contar con una buena y confiable estimación de la talla de madurez. En primer lugar, el jurel realiza una migración reproductiva fuera de la costa en primavera (octubre a diciembre,

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Effects of exposure to extended photoperiods during the first winter on long-term growth and age at first maturity in turbot (Scophthalmus maximus)

Cited by 79 publications

References 29 publications

The influence of anaerobic muscle activity, maturation and season on the flesh quality of farmed turbot

The influence of anaerobic muscle activity, maturation and season on the flesh quality of farmed turbot

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Estimacion de la talla media de madurez sexual en Trachurus murphyi mediante

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