scholarly journals Effects of dietary taurine level on visual function in European sea bass (Dicentrarchus labrax)

2019 ◽  
Author(s):  
Richard W. Brill ◽  
Andrij Z. Horodysky ◽  
Allen R. Place ◽  
Mary E.M. Larkin ◽  
Renate Reimschuessel
Keyword(s):  
Spectral Sensitivity ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
European Sea Bass ◽  
Flicker Fusion Frequency ◽  
Taurine Level ◽  
Plant Protein Sources ◽  
Cultured Fish ◽  
And Function ◽  
The Cost

AbstractDietary insufficiencies have been well documented to decrease growth rates and survival (and therefore overall production) in fish aquaculture. By contrast, the effects of dietary insufficiencies on the sensory biology of cultured fish remains largely unstudied. Diets based solely on plant protein sources could have advantages over fish-based diets, because of the cost and ecological effects of the latter, but lack the amino acid taurine. Adequate levels of taurine are, however, necessary for the development of a fully functional visual system in mammals. As part of ongoing studies to determine the suitability of plant-based diets, we investigated the effects of normal and reduced taurine dietary levels on retinal anatomy and function in European sea bass (Dicentrarchus labrax). We could not demonstrate any effects of dietary taurine level on retinal anatomy, nor the functional properties of luminous sensitivity or temporal resolution (measured as flicker fusion frequency). We did, however, find an effect on spectral sensitivity. The peak of spectral sensitivity of individuals fed a 5% taurine diet was rightward shifted (i.e., towards longer wavelengths) relative to that of fish fed a 0% or 1.5 % taurine diet. This difference in in spectral sensitivity was due to a relatively lower level of middle wavelength pigment (maximum absorbance ≈500 nm) in fish fed a 5% taurine diet. Changes in spectral sensitivity resulting from diets containing different taurine levels are unlikely to be detrimental to fish destined for market but could be in fishes that are being reared for stock enhancement programs.

scholarly journals Intestinal B0AT1 (SLC6A19) and PEPT1 (SLC15A1) mRNA levels in European sea bass (Dicentrarchus labrax) reared in fresh water and fed fish and plant protein sources

2015 ◽  
Vol 4 ◽  
Author(s):  
Simona Rimoldi ◽  
Elena Bossi ◽  
Sheenan Harpaz ◽  
Anna Giulia Cattaneo ◽  
Giovanni Bernardini ◽  
...  
Keyword(s):  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Fish Growth ◽  
Mrna Levels ◽  
Feed Conversion ◽  
European Sea Bass ◽  
Protein Sources ◽  
Plant Protein Sources

AbstractThe objective of the present study was to examine the effect of diets with descending fish meal (FM) inclusion levels and the addition of salt to the diet containing the lowest FM level on growth performances, feed conversion ratio, and intestinal solute carrier family 6 member 19 (SLC6A19) and oligopeptide transporter 1 (PEPT1) transcript levels, in freshwater-adapted European sea bass (Dicentrarchus labrax). We first isolated by molecular cloning and sequenced a full-length cDNA representing the neutral amino acid transporter SLC6A19 in sea bass. The cDNA sequence was deposited in GenBank database (accession no. KC812315). The twelve transmembrane domains and the ‘de novo’ prediction of the three-dimensional structure of SLC6A19 protein (634 amino acids) are presented. We then analysed diet-induced changes in the mRNA copies of SLC6A19 and PEPT1 genes in different portions of sea bass intestine using real-time RT-PCR. Sea bass were fed for 6 weeks on different diets, with ascending levels of fat or descending levels of FM, which was replaced with vegetable meal. The salt-enriched diet was prepared by adding 3 % NaCl to the diet containing 10 % FM. SLC6A19 mRNA in the anterior and posterior intestine of sea bass were not modulated by dietary protein sources and salt supplementation. Conversely, including salt in a diet containing a low FM percentage up-regulated the mRNA copies of PEPT1 in the hindgut. Fish growth correlated positively with the content of FM in the diets. Interestingly, the addition of salt to the diet containing 10 % FM improved feed intake, as well as specific growth rate and feed conversion ratio.

scholarly journals Effects of dietary taurine level on visual function in European sea bass (Dicentrarchus labrax)

PLoS ONE ◽  
2019 ◽  
Vol 14 (6) ◽  
pp. e0214347 ◽  
Author(s):  
Richard W. Brill ◽  
Andrij Z. Horodysky ◽  
Allen R. Place ◽  
Mary E. M. Larkin ◽  
Renate Reimschuessel
Keyword(s):  
Visual Function ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
European Sea Bass ◽  
Taurine Level

scholarly journals Potential application and beneficial effects of a marine microalgal biomass produced in a high-rate algal pond (HRAP) in diets of European sea bass, Dicentrarchus labrax

2021 ◽  
Author(s):  
Giulia Pascon ◽  
Maria Messina ◽  
Lisa Petit ◽  
Luisa Maria Pinheiro Valente ◽  
Beatriz Oliveira ◽  
...  
Keyword(s):  
Control Diet ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
Nutrient Digestibility ◽  
Fish Growth ◽  
High Rate ◽  
European Sea Bass ◽  
Microalgal Biomass ◽  
Distal Intestine ◽  
Plant Protein Sources

AbstractMicroalgae have been used as live food in aquatic species. In recent years, the interest in microalgae has considerably increased, thanks to the evolution of production techniques that have identified them as an ecologically attractive aquafeed ingredient. The present study provides the first data about the effects of dietary inclusion of a microalgae consortium grown in a high-rate algal pond system on zootechnical performance, morphometric indices, and dietary nutrient digestibility as well as morphology and functionality of the digestive system of European sea bass, Dicentrarchus labrax. A dietary treatment including a commercial mono-cultured microalgae (Nannochloropsis sp.) biomass was used for comparison. Six hundred and thirty-six European sea bass juveniles (18 ± 0.28 g) were randomly allotted into 12 experimental groups and fed 4 different diets for 10 weeks: a control diet based on fish meal, fish oil, and plant protein sources; a diet including 10% of Nannochloropsis spp. biomass (100 g/kg diet); and two diets including two levels (10% and 20%) of the microalgal consortium (100 and 200 g/kg diet). Even at the highest dietary inclusion level, the microalgal consortium (200 g/kg diet) did not affect feed palatability and fish growth performance. A significant decrease in the apparent digestibility of dry matter, protein, and energy was observed in diets including 10 and 20% of the microalgal consortium, but all fish exhibited a well-preserved intestinal histomorphology. Moreover, dietary inclusion with the microalgal consortium significantly increased the enzymatic activity of maltase, sucrase-isomaltase, and ɤ-glutamil transpeptidase in the distal intestine of the treated European sea bass. Algal consortium grown using fish farm effluents represents an attempt to enhance the utilization of natural biomasses in aquafeeds when used at 10 % as substitute of vegetable ingredients in diet for European sea bass.

Vaccination of European sea bass Dicentrarchus labrax with avirulent Mycobacterium marinum (iipA::kan mutant)

2019 ◽  
Vol 90 ◽  
pp. 317-327 ◽  
Author(s):  
Shay Ravid-Peretz ◽  
Angelo Colorni ◽  
Galit Sharon ◽  
Michal Ucko
Keyword(s):  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
Mycobacterium Marinum ◽  
European Sea Bass

Cortisol concentration in scales is a valid indicator for the assessment of chronic stress in European sea bass, Dicentrarchus labrax L

Aquaculture ◽  
2021 ◽  
pp. 737257
Author(s):  
A. Samaras ◽  
A. Dimitroglou ◽  
S. Kollias ◽  
G. Skouradakis ◽  
I.E. Papadakis ◽  
...  
Keyword(s):  
Chronic Stress ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
Cortisol Concentration ◽  
European Sea Bass

Cellular alterations in different organs of European sea bass Dicentrarchus labrax (L.) exposed to cadmium

Chemosphere ◽  
2007 ◽  
Vol 67 (6) ◽  
pp. 1171-1181 ◽  
Author(s):  
L. Giari ◽  
M. Manera ◽  
E. Simoni ◽  
B.S. Dezfuli
Keyword(s):  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
European Sea Bass ◽  
Cellular Alterations

Morphology of the european sea bass (dicentrarchus labrax) tongue

2011 ◽  
Vol 75 (5) ◽  
pp. 643-649 ◽  
Author(s):  
Francesco Abbate ◽  
Maria Cristina Guerrera ◽  
Giuseppe Montalbano ◽  
Felix De Carlos ◽  
Alberto Álvarez Suárez ◽  
...  
Keyword(s):  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
European Sea Bass

Analysis of the Sox gene family in the European sea bass (Dicentrarchus labrax)

2004 ◽  
Vol 137 (2) ◽  
pp. 279-284 ◽  
Author(s):  
Malyka Galay-Burgos ◽  
Lynda Llewellyn ◽  
Constantinos C Mylonas ◽  
Adelino V.M Canario ◽  
Silvia Zanuy ◽  
...  
Keyword(s):  
Gene Family ◽  
Dicentrarchus Labrax ◽  
Sea Bass ◽  
European Sea Bass ◽  
Sox Gene

scholarly journals Antioxidant Activities and Selenogene Transcription in the European Sea Bass (Dicentrarchus labrax) Liver Depend, in a Non-linear Manner, on the Se/Hg Molar Ratio of the Feeds

2021 ◽  
Author(s):  
Marinelle Espino ◽  
Harkaitz Eguiraun ◽  
Oihane Diaz de Cerio ◽  
José Antonio Carrero ◽  
Nestor Etxebarria ◽  
...  
Keyword(s):  
Antioxidant Activities ◽  
Dicentrarchus Labrax ◽  
Thioredoxin Reductase ◽  
Sea Bass ◽  
Molar Ratio ◽  
Antioxidant Systems ◽  
European Sea Bass ◽  
Thioredoxin System ◽  
Non Linear ◽  
Linear Manner

AbstractFeeding 3.9 and 6.7 mg Hg/kg (Se/Hg molar ratios of 0.8 and 0.4, respectively) for 14 days negatively affected Dicentrarchus labrax growth and total DNTB- and thioredoxin-reductase (TrxR) activities and the transcription of four redox genes (txn1, gpx1, txnrd3, and txnrd2) in the liver, but a diet with 0.5 mg Hg/kg (Se/Hg molar ratio 6.6) slightly increased both reductase activities and the transcription of txn1, gpx1, and txnrd2. Feeding 6.7 mg Hg/kg for 53 days downregulated the genes of the thioredoxin system (txn1, txnrd3, and txnrd2) but upregulated gpx1, confirming the previously proposed complementarity among the antioxidant systems. Substitution of 20% of the feed by thawed white fish (hake) slightly counteracted the negative effects of Hg. The effects were not statistically significant and were dependent, in a non-linear manner, on the Se/Hg molar ratio of the feed but not on its Hg concentration. These results stress the need to consider the Se/Hg molar ratio of the feed/food when evaluating the toxicity of Hg.

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