scholarly journals An investigation of links between metabolic rate and feed efficiency in European sea bass Dicentrarchus labrax

2021 ◽  
Author(s):  
Charles Rodde ◽  
Hugues de Verdal ◽  
Marc Vandeputte ◽  
François Allal ◽  
Julie Nati ◽  
...  
Keyword(s):  
Body Weight ◽  
Metabolic Rate ◽  
Feed Efficiency ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
Effect Of Temperature ◽  
Routine Metabolic Rate ◽  
Intermittent Flow ◽  
European Sea Bass ◽  
Ad Libitum

Abstract Feed efficiency (FE) is the amount of body weight gain for a given feed intake. Improving FE through selective breeding is key for sustainable finfish aquaculture but its evaluation at individual level is technically challenging. We therefore investigated whether individual routine metabolic rate (RMR) was a predictor of individual FE in the European sea bass Dicentrarchus labrax, a major species in European mariculture. The European sea bass has three genetically distinct populations across its geographical range, namely Atlantic Ocean (AT), West Mediterranean (WM) and East Mediterranean (EM). We compared FE and RMR of fish from these three populations at 18°C or 24°C. We held 200 fish (62 AT, 66 WM and 72 EM) in individual aquaria and fed them from ad libitum down to fasting. Feed efficiency was assessed for an ad libitum feeding rate and for a fixed restricted ration (1% of metabolic body weight.day -1, with metabolic body weight = body weight 0.8). After being refed 12 weeks in a common tank, individual RMR was measured over 36h by intermittent flow respirometry. There was a significant effect of temperature whereby fish at 18°C had greater mean FE (P < 0.05) and lower RMR (P < 0.001). There was also a significant effect of population, where AT fish had lower FE (P < 0.05) and greater RMR (P < 0.001) than WM and EM, at both temperatures. Despite these differences in temperature and population means, individual FE and RMR were not significantly correlated (P > 0.05). Therefore, although the results provide evidence of an association between metabolic rate and FE, RMR was not a predictor of individual FE, for reasons that require further investigation.

scholarly journals Effect of selection for fasting tolerance on feed intake, growth and feed efficiency in the European sea bass Dicentrarchus labrax

Aquaculture ◽  
2014 ◽  
Vol 420-421 ◽  
pp. S42-S49 ◽  
Author(s):  
Sophie Daulé ◽  
Marc Vandeputte ◽  
Alain Vergnet ◽  
Bruno Guinand ◽  
Laure Grima ◽  
...  
Keyword(s):  
Feed Intake ◽  
Feed Efficiency ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
European Sea Bass ◽  
Selection For ◽  
Fasting Tolerance

scholarly journals QTL for Stress and Disease Resistance in European Sea Bass, Dicentrarhus labrax L.

Animals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1668
Author(s):  
Dimitrios Chatziplis ◽  
Stavroula Oikonomou ◽  
Dimitrios Loukovitis ◽  
Dimitrios Tsiokos ◽  
Athanasios Samaras ◽  
...  
Keyword(s):  
Body Weight ◽  
Stress Test ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
Growth Stages ◽  
Production Traits ◽  
Linkage Groups ◽  
Family Selection ◽  
European Sea Bass ◽  
Glucose Levels

There is a growing interest in selective breeding in European sea bass (Dicentrarchus labrax), especially regarding family selection based on growth performance. In particular, quantitative trait loci (QTL) identification in sea bass enhances the application of marker-assisted breeding for the genetic improvement of the production traits. The aims of the study were to identify potential QTL affecting stress and immunological indicators, body weight, and mortality after vibriosis injection in sea bass as well as to estimate heritability and genetic/phenotypic correlations for the aforementioned traits. To this end, stress test was performed on 960 offspring and a sub-group of them (420) was selected to explore the mortality after vibrio injection. Selective genotyping was performed in 620 offspring for 35 microsatellite markers and distributed into 6 linkage groups. The length of the genetic linkage map was 283.6 cM and the mean distance between the markers was 8.1 cM. QTL affecting body weight in three different growth periods detected on linkage groups LG1, LG4, LG6, and LG14. A QTL associated with weight in early growth stages (290–306 days post-hatching) was also identified on LG3. QTL analysis confirmed the existence of QTL affecting cortisol levels, on LG3 and LG14. Moreover, new QTL affecting only cortisol and glucose levels were detected on LG1 and LG23. No QTL affecting hormonal or biochemical marks was found on LG4 and LG6. Heritability of cortisol, lysozyme levels, and mortality were high (0.36, 0.55, and 0.38, respectively).

The Effects of Dietary Vitamin C Levels on Tissue Ascorbic Acid Concentration and Growth in European Sea Bass (Dicentrarchus labrax, L.1758)

2019 ◽  
Author(s):  
Aysun KOP
Keyword(s):  
Ascorbic Acid ◽  
Body Weight ◽  
Vitamin C ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
The Other ◽  
Dietary Vitamin ◽  
European Sea Bass ◽  
Final Body Weight ◽  
Kidney Liver

The effect of different dietary levels of L-ascorbic acid on the growth and vitamin C concentration in the tissue of European Sea bass (Dicentrarchus labrax, L.1753) with an initial body weight of 4.6±1.1 g was studied. Four practical diets were formulated to containing 10 (AA10), 25 (AA25), 42 (AA42) and 65 (AA65) mg ascorbic acid equivalent kg-1 diet. The results of a 20 week feeding trial showed that typical vitamin C-deficiency signs and high mortality in the fish fed with the AA10 diet. The fish fed with AA42 (42 mg kg-1 AA diet) showed a significantly higher final body weight than the other diets (P less than 0.05) and the concentrations of ascorbic acid (AA) in the brain of these fish were higher than in the other experimental group (P less than 0.05). In this study, the amount of storage in the organs occurred in this order: brain, kidney, liver.

scholarly journals Population, Temperature and Feeding Rate Effects on Individual Feed Efficiency in European Sea Bass (Dicentrarchus labrax)

2020 ◽  
Vol 7 ◽  
Author(s):  
Charles Rodde ◽  
Marc Vandeputte ◽  
François Allal ◽  
Mathieu Besson ◽  
Frédéric Clota ◽  
...  
Keyword(s):  
Feed Efficiency ◽  
Feeding Rate ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
European Sea Bass ◽  
Rate Effects

scholarly journals Transgenerational effects decrease larval resilience to ocean acidification and warming but juvenile European sea bass could benefit from higher temperatures in the NE Atlantic

2021 ◽  
Author(s):  
Sarah Howald ◽  
Marta Moyano ◽  
Amélie Crespel ◽  
Louise Cominassi ◽  
Guy Claireaux ◽  
...  
Keyword(s):  
Metabolic Rate ◽  
Ocean Acidification ◽  
Larval Growth ◽  
Sea Bass ◽  
Standard Metabolic Rate ◽  
Routine Metabolic Rate ◽  
Juvenile Growth ◽  
European Sea Bass ◽  
Larval Size ◽  
Size At Metamorphosis

The aim of this study was to investigate the effect of ocean acidification (OA) and warming (OW) as well as the transgenerational effect of OA on larval and juvenile growth and metabolism of a large economically important fish species with a long generation time. Therefore we incubated European sea bass from Brittany (France) for two generations (>5 years in total) under current and predicted OA conditions (PCO2: 650 and 1700 μatm). In the F1 generation both OA condition were crossed with OW (temperature: 15-18 °C and 20-23 °C). We found that OA alone did not affect larval or juvenile growth and OW increased developmental time and growth rates, but OAW decreased larval size at metamorphosis. Larval routine metabolic rate (RMR) and juvenile standard metabolic rate (SMR) were significantly lower in cold compared to warm conditioned fish and also lower in F0 compared to F1 fish. We did not find any effect of OA on RMR or SMR. Juvenile PO2crit was not affected by OA, OW or OAW in both generations. We discuss the potential underlying mechanisms resulting in beneficial effects of OW on F1 larval growth and RMR and in resilience of F0 and F1 larvae and juveniles to OA, but on the other hand resulting in vulnerability of F1, but not F0 larvae to OAW. With regard to the ecological perspective, we conclude that recruitment of larvae and early juveniles to nursery areas might decrease under OAW conditions but individuals reaching juvenile phase might benefit from increased performance at higher temperatures.

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