The effect of two commercial feeds of differing protein content, 35% or 40% (HI-35 and EXP), on Pacific White Shrimp Litopenaeus vannamei, performance, and system water quality were investigated. J...

01 Aug 2018·Aquaculture Research

Organic acids blend as dietary antibiotic replacer in marine fish olive flounder,Paralichthys olivaceus

Author: Bharadwaj, Anant S ; Park, Gunhyun ; Bai, Sungchul C ; Browdy, Craig L ; Vazquez-Anon, Mercedes ; Katya, Kumar

The present study was conducted to evaluate the efficacy of organic acid blends as dietary antibiotic replacer in marine fish olive flounder, Paralichthys olivaceus.Fish averaging 3.5 ± 0.05 g (mean ± SD) were fed one of the four exptl. diets: (1) without antibiotic or organic acid (Control/CON); (2) with antibiotic-50 mg oxytetracycline per kg body weight per day (OTC); (3) with organic acid blend A-4 g/kg diet (OA_A); and (4) with organic acid blend B-4 g/kg diet (OA_B), for 10 wk.At the end of the experiment, total intestinal bacterial counts in fish-fed OA_A, OA_B and OTC were significantly lower than that of fish-fed CON diet (p < 0.05).Further, the group of fish-fed organic acid blends (OA_A, OA_B) or antibiotic (OTC)-supplemented diets exhibited lower intestinal Vibrio sp. counts compared with fish-fed CON diet.Disease challenge test with bacteria Edwardsiella tarda showed significantly lower cumulative mortality rates for the group of fish-fed OA_A, OA_B or OTC than that of fish-fed CON diet (p < 0.05).There were no neg. effects on the growth, serol. characteristics and proximate composition among the group of fish-fed different exptl. diets.Therefore, the present experiment demonstrates that blends of organic acid could be a promising alternative to dietary antibiotics for the preventive and/or curative health management in marine fish olive flounder aquaculture.

01 Feb 2000·Lab animalQ1 · AGRICULTURAL & FORESTRY SCIENCE

Factors influencing required dietary nutrient concentrations.

Q1 · AGRICULTURAL & FORESTRY SCIENCE

Article

Author: Knapka, J J

A review of the genetic and environmental factors that must be considered when forming nutritionally adequate diets for specific laboratory animal colonies.

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