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<p>The current study investigates the combined effect of different dietary vitamins E and selenium (sodium selenite, Se) on the growth, survival, feed utilization, nutrients digestibility, body composition, activity test evaluation, intestinal bacterial load, and hematological indices of European seabass, <i>Dicentrarchus labrax</i> fry. A feeding experiment was conducted in <i>D. labrax</i> using five different diets with the same proximate composition. Introvit-ES100 oral® (ES) provides 50 mg/mL vitamin E and 0.5 mg/mL selenium, a source of VE and Se. The only distinction between the diets was the level of VE and SE. Each diet was fed to triplicate groups of fish (initial weight: 0.13&#xa0;g) for 84 days. The control diet (ES<sub>0</sub>%) did not contain any added ES. Diets 2–5 included varying: 50: 0.5 mg/kg (ES<sub>1</sub>%), 100: 1.0 mg/kg (ES<sub>2</sub>%), 150: 1.5 mg/kg (ES<sub>3</sub>%), and 200: 2.0 mg/kg (ES<sub>4</sub>%). The water quality parameters were temperature 22, with a pH range of 7.9–8.2, the salinity range is 31.3–32.4 ppt, and the nitrogen concentrations are as follows: N at 0.54, NH<sub>3</sub> at 0.73, and NH<sub>4</sub> at 0.77. The results showed that seabass fry had the highest FBW, WG, SGR, FL, and K values when fed 150: 1.5 mg kg<sup>−1</sup> of VE and Se, respectively (ES<sub>3</sub>%). Fish provided the ES<sub>4</sub>% diet had the highest survival (%) and showed inferior growth performance. Apparent digestibility coefficient analysis, which included protein, lipid, and carbohydrate digestibility, revealed that the highest values were recorded in fish fed the ES<sub>3</sub>% diets. The highest body protein was recorded in ES<sub>3</sub>%; the lowest lipid content value was recorded in ES<sub>4</sub>%. The highest white blood cell count, red blood cell count, and hematocrit values were recorded in ES<sub>3</sub>%. While the highest hemoglobin values were recorded in ES<sub>4</sub>%. The highest activity test value was recorded in ES<sub>2</sub>% and ES<sub>3</sub>% diets. The lowest <i>Vibrio</i> sp. count was recorded in ES<sub>3</sub>%. While the <i>Aeromonas</i> sp. was not detected in all experimental treatments. The results indicated that supplementing the diet with 150 mg kg<sup>−1</sup> of VE and 1.5 mg kg<sup>−1</sup> of Se improved growth performance, feed utilization, and survival rates, resulting in increased production of <i>D. labrax</i> fry after weaning in marine hatcheries.</p>

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The effects of different vitamin E and selenium levels on growth performance, feed utilization, body composition, and intestinal bacterial load of European seabass (Dicentrarchus labrax) post-weaning fry

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  • 发表日期：

    2025年1月3日

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  • A. M. Kotit,
  • E. A. Omar,
  • T. M. Srour,
  • H. A. H Ibrahim,
  • Ehab El-Haroun,
  • A.M.A.S.Goda

摘要

The current study investigates the combined effect of different dietary vitamins E and selenium (sodium selenite, Se) on the growth, survival, feed utilization, nutrients digestibility, body composition, activity test evaluation, intestinal bacterial load, and hematological indices of European seabass, Dicentrarchus labrax fry. A feeding experiment was conducted in D. labrax using five different diets with the same proximate composition. Introvit-ES100 oral® (ES) provides 50 mg/mL vitamin E and 0.5 mg/mL selenium, a source of VE and Se. The only distinction between the diets was the level of VE and SE. Each diet was fed to triplicate groups of fish (initial weight: 0.13 g) for 84 days. The control diet (ES0%) did not contain any added ES. Diets 2–5 included varying: 50: 0.5 mg/kg (ES1%), 100: 1.0 mg/kg (ES2%), 150: 1.5 mg/kg (ES3%), and 200: 2.0 mg/kg (ES4%). The water quality parameters were temperature 22, with a pH range of 7.9–8.2, the salinity range is 31.3–32.4 ppt, and the nitrogen concentrations are as follows: N at 0.54, NH3 at 0.73, and NH4 at 0.77. The results showed that seabass fry had the highest FBW, WG, SGR, FL, and K values when fed 150: 1.5 mg kg−1 of VE and Se, respectively (ES3%). Fish provided the ES4% diet had the highest survival (%) and showed inferior growth performance. Apparent digestibility coefficient analysis, which included protein, lipid, and carbohydrate digestibility, revealed that the highest values were recorded in fish fed the ES3% diets. The highest body protein was recorded in ES3%; the lowest lipid content value was recorded in ES4%. The highest white blood cell count, red blood cell count, and hematocrit values were recorded in ES3%. While the highest hemoglobin values were recorded in ES4%. The highest activity test value was recorded in ES2% and ES3% diets. The lowest Vibrio sp. count was recorded in ES3%. While the Aeromonas sp. was not detected in all experimental treatments. The results indicated that supplementing the diet with 150 mg kg−1 of VE and 1.5 mg kg−1 of Se improved growth performance, feed utilization, and survival rates, resulting in increased production of D. labrax fry after weaning in marine hatcheries.