scholarly journals Response of European sea bass (Dicentrarchus labrax) to graded levels of methionine (total sulfur amino acids) in soya protein-based semi-purified diets

2010 ◽  
Vol 104 (5) ◽  
pp. 664-673 ◽  
Author(s):  
Francesca Tulli ◽  
Maria Messina ◽  
Matteo Calligaris ◽  
Emilio Tibaldi
Keyword(s):  
Amino Acids ◽  
Body Weight ◽  
Feed Intake ◽  
Dietary Protein ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
Soya Protein ◽  
Total Sulfur ◽  
Deficient Diet ◽  
European Sea Bass

The dietary methionine (Met) and total sulfur amino acid (TSAA) requirements of European sea bass (Dicentrarchus labrax) (initial body weight 13·4 (sd 0·2) g) were estimated in a 12-week dose–response experiment. Seven isonitrogenous (7·6 % DM) and isoenergetic (gross energy, 21·2 MJ/kg DM) diets, based on soya protein and crystalline l-amino acids containing graded levels of l-Met (1·6–16·2 g/kg) at a constant cysteine (4 g/kg) level and a fish meal-based diet, were fed each to triplicate groups of fifty fish kept in 250 litre tanks in a thermoregulated (23 ± 0·5°C) seawater system. The Met and TSAA-deficient diet resulted in higher mortality, impaired feed intake and growth relative to the other treatments (P < 0·01). No signs of lens opacity due to limiting Met intake were observed and no feed intake or growth depression occurred at the highest level of dietary TSAA. Met and TSAA requirements for optimal N deposition or weight gain as fitted with the broken-line model resulted in estimated values of 8·0 and 12·0 g/kg diet (for example, 1·8 and 2·7 % dietary protein) and 9·1 and 13·1 g/kg diet (for example, 2·0 and 3·0 % dietary protein), respectively. Plasma levels of Met, homocysteine and cysteine increased in response to excess dietary TSAA, corroborating requirement estimates from growth data. N gain resulted in a linear function of TSAA consumption at marginal Met (TSAA) intake. The TSAA intake needed to maintain N balance resulted in a value of 20·0 mg TSAA/kg average body weight0·75 per d, which represents 23 % of the total (maintenance+accretion) requirement.

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.

Effect of two sulfur-containing amino acids, taurine and hypotaurine in European sea bass (Dicentrarchus labrax) sperm cryopreservation

Cryobiology ◽  
2013 ◽  
Vol 66 (3) ◽  
pp. 333-338 ◽  
Author(s):  
S. Martínez-Páramo ◽  
P. Diogo ◽  
M.T. Dinis ◽  
F. Soares ◽  
C. Sarasquete ◽  
...  
Keyword(s):  
Amino Acids ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
Sperm Cryopreservation ◽  
European Sea Bass ◽  
Sulfur Containing

scholarly journals Resistance to viral nervous necrosis in European sea bass (Dicentrarchus labrax L.): heritability and relationships with body weight, cortisol concentration, and antibody titer

2021 ◽  
Vol 53 (1) ◽  
Author(s):  
Sara Faggion ◽  
Daniela Bertotto ◽  
Massimiliano Babbucci ◽  
Giulia Dalla Rovere ◽  
Rafaella Franch ◽  
...  
Keyword(s):  
Body Weight ◽  
Antibody Titer ◽  
Selective Breeding ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
Cortisol Concentration ◽  
European Sea Bass ◽  
Testing Procedures ◽  
Viral Nervous Necrosis ◽  
Highest Posterior Density

Abstract Background Susceptibility of European sea bass (Dicentrarchus labrax L.) to viral nervous necrosis (VNN) is well-known. Interest towards selective breeding as a tool to enhance genetic resistance in this species has increased sharply due to the major threat represented by VNN for farmed sea bass and limitations concerning specific therapeutical measures. A sea bass experimental population (N = 650) was challenged with nervous necrosis virus (NNV) to investigate genetic variation in VNN mortality. In addition, relationships of this trait with serum cortisol concentration after stress exposure, antibody titer against NNV antigens, and body weight at a fixed age were studied to identify potential indicator traits of VNN resistance. Results The estimate of heritability for VNN mortality was moderate and ranged from 0.15 (HPD95%, 95% highest posterior density interval: 0.02, 0.31) to 0.23 (HPD95%: 0.06, 0.47). Heritability estimates for cortisol concentration, antibody titer, and body weight were 0.19 (HPD95%: 0.07, 0.34), 0.36 (HPD95%: 0.16, 0.59) and 0.57 (HPD95%: 0.33, 0.84), respectively. Phenotypic relationships between traits were trivial and not statistically significant, except for the estimated correlation between antibody titer and body weight (0.24). Genetic correlations of mortality with body weight or antibody titer (− 0.39) exhibited a 0.89 probability of being negative. A negligible genetic correlation between mortality and cortisol concentration was detected. Antibody titer was estimated to be positively correlated with body weight (0.49). Conclusions Antibody titer against NNV offers the opportunity to use indirect selection to enhance resistance, while the use of cortisol concentration as an indicator trait in breeding programs for VNN resistance is questionable. The estimate of heritability for VNN mortality indicates the feasibility of selective breeding to enhance resistance to NNV and raises attention to the development of genomic prediction tools to simplify testing procedures for selection candidates.

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 &lt; 0.05) and lower RMR (P &lt; 0.001). There was also a significant effect of population, where AT fish had lower FE (P &lt; 0.05) and greater RMR (P &lt; 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 &gt; 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.

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