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Effect of autoclaved Ulva meal on growth performance, nutrient utilization and fatty acid profile of rainbow trout, Oncorhynchus mykiss

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Abstract

A feeding trial was conducted to investigate the effects of the dietary incorporation of autoclaved and raw (non-autoclaved) Ulva meal on juvenile rainbow trout (Oncorhynchus mykiss) growth, nutrient utilization, body composition, diet digestibility and fatty acid composition. An algae-free control diet and four experimental diets with either 5 or 10 % inclusion levels of raw Ulva meal (5 % = RU5; 10 % = RU10) or autoclaved Ulva meal (5 % = AU5; 10 % = AU10) were formulated. Fish were fed three times daily to apparent satiation for 12 weeks. The growth of fish fed RU10 (final weight = 76.7 ± 3.31 g; SGR = 2.8 ± 0.05 %) diet was significantly higher than that in fish fed the AU10 diet (67.5 ± 1.61 g; SGR = 2.6 ± 0.03 %). The feed conversion ratio (FCR) was significantly better in fish fed the RU10 diet (0.9 ± 0.06) compared with control diet (1.0 ± 0.06). Condition factor, viscerosomatic index and dress-out remained unaffected by dietary treatment. The hepatosomatic index (HSI) was significantly lower (P < 0.05) in fish fed the AU10 diet (1.2 ± 0.19) than fish fed the other diets (≥1.6). The level of eicosapentaenoic acid (20:5n-3—EPA) in muscle from fish fed the RU10, AU5 and AU10 diets was significantly higher than in fish fed control diet (P < 0.05). Dietary inclusion of Ulva meals resulted in a significant increase in muscle docosapentaenoic acid (22:5n-3—DPA) levels at the end of the feeding period. The results indicate that the dietary inclusion of raw Ulva meal at levels of up to 10 % can be used without significant negative effects on the growth performance, nutrient utilization, dietary digestibility and muscle fatty acid composition. In fact, the inclusion of dietary raw and autoclaved Ulva meal elevated n-3 fatty acids levels of rainbow trout muscle.

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Acknowledgments

The authors kindly thank Zeki Sönmez, İzzet Şahin, Volkan Tepe and Serhan Mantoğlu for their technical assistance. We would also like to thank Agromey Feed Mill Company and Kartal Chemical Incorporated for providing feed ingredients.

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Authors and Affiliations

  1. Department of Aquaculture, Armutlu Vocational College, University of Yalova, 77500, Yalova, Turkey

    Betül Güroy & Derya Güroy

  2. Department of Aquaculture, Faculty of Fisheries, Canakkale Onsekiz Mart University, 17100, Canakkale, Turkey

    Sebahattin Ergün

  3. Aquaculture and Fish Nutrition Research Group, School of Biomedical and Biological Sciences, Plymouth University, Plymouth, Devon, PL4 8AA, UK

    Daniel L. Merrifield

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  1. Betül Güroy
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  2. Sebahattin Ergün
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  4. Derya Güroy
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Correspondence to Betül Güroy.

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Güroy, B., Ergün, S., Merrifield, D.L. et al. Effect of autoclaved Ulva meal on growth performance, nutrient utilization and fatty acid profile of rainbow trout, Oncorhynchus mykiss . Aquacult Int 21, 605–615 (2013). https://doi.org/10.1007/s10499-012-9592-7

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