RESEARCH ARTICLE


The Intestinal Evacuation and Maximum Daily Consumption of Purified Formulated Diets by Juvenile Grass Carp (Ctenopharyngodon idella)



Zhen-Yu Du1, 2, *, Li-Xia Tian1, Gui-Ying Liang1, Han-Bing Lan3, Yong-Jian Liu1, *
1 Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, 510275 Guangzhou, P.R. China
2 National Institute of Nutrition and Seafood Research (NIFES), 5005 Bergen, Norway
3 Guangdong Academy of Agriculture Sciences, 510640 Guangzhou, P.R. China


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© 2009 Du et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the National Institute of Nutrition and Seafood Research (NIFES), Postboks 2029 Nordnes, 5817 Bergen, Norway; Tel: +47 91132279; Fax: +47 5590 5298; E-mail: zdu@nifes.noCorrespondence: Institute of Aquatic Economic Animals, Sun Yat-sen University, Xin’gang Xi, Road, 510275 Guangzhou, P.R. China; Tel: +86 84110789; E-mail: edls@mail.sysu.edu.cn


Abstract

The intestinal evacuation and maximum daily consumption of two formulated diets with different lipid content (6 and 10%) was examined in juvenile grass carp at 28°C. Fish were fed formulated diets to satiety and removed at 1 hour interval for intestine weighing. The study showed that both diets were evacuated from intestine in 12h and the process of evacuation was expressed by linear regression. In the later study of maximum daily consumption, fish were fed formulated diets to satiety four times in a single day. The sum of diet consumption in the day was recorded. The experiment was repeated in 4, 7, 10, 13, 16, 19, 22 day by the same fish. The result showed the maximum daily consumption of two formulated diets is 3.64 ± 0.23 % body weight (416.79 ± 28.84 J/g.d-1) and 3.75 ± 0.16 % body weight (481.73 ± 19.44 J/g.d-1).

Keywords: Grass carp, intestinal evacuation, maximum daily consumption, formulated diet.