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Dietary Copper Requirement of Juvenile Uriental River Prawn, Macrobrachium nipponense

  • GUO Jianlin ,
  • CHEN Jianming ,
  • PAN Qian ,
  • SHEN Binqian ,
  • SUN Lihui ,
  • JIANG Jianhu
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  • Zhejiang Institute of Freshwater Fisheries, Huzhou 313001 China

Received date: 2013-12-18

  Online published: 2014-05-30

Abstract

In order to estimate the dietary copper requirement of juvenile oriental river prawn (Macrobrachium nipponense), the effects of dietary copper content on growth performance, body composition, immunity and the contents of copper, zinc and iron in tissues of juvenile oriental river prawn were studied. Seven experimental diets were formulated with CuSO4 as the copper source, which the copper contents were 0.63, 6.70, 12.64, 19.15, 25.64, 31.99 and 65.27 mg/kg, respectively. A total of 840 juvenile oriental river prawns with an initial body weight of (0.10±0.01) g were randomly divided into 7 groups with 3 replicates per group and 40 prawns per replicate. Each group of prawns was fed one diet for 49 days. The results showed as follows: the weight gain rate (WGR) and specific growth rate (SGR) were firstly increased and then decreased with dietary cooper content increasing, while the feed conversion rate (FCR) had an opposite trend. The highest values of WGR and SGR were found in 25.64 mg/kg group, and significantly higher than those in 0.63, 6.70, 12.64, 19.15 and 65.27 mg/kg groups (P0.05). The highest values of serum phenoloxidase (PO) and copper-zinc superoxide dismutase (CuZn-SOD) activities were all found in 31.99 mg/kg group, and were increased by 101.09% (P<0.05) and 76.64% (P<0.05) compared with 0.63 mg/kg group. The whole body copper content in 0.63, 6.70 and 12.64 mg/kg groups was lower, and significantly lower than that in 31.99 and 65.27 mg/kg groups (P<0.05). The copper content in muscle and hepatopancreas was continually increased with dietary copper content increasing, which manifested as 63.70 mg/kg group was significantly higher than other groups (P<0.05). With dietary copper content increasing, the content of whole body zinc showed a trend of first stable and then decrease, while the content of whole body iron showed a trend of stagewise decrease. In conclusion, under the conditions of this experiment, moderate dietary cooper content can enhance the growth performance and immunity of juvenile oriental river prawn, and the contents of copper, zinc and iron in tissues are affected by dietary copper content. Broken-line model analysis results show that the dietary copper requirements for maximum WGR and carapace zinc deposition are 24.68 and 21.48 mg/kg, respectively.

Cite this article

GUO Jianlin , CHEN Jianming , PAN Qian , SHEN Binqian , SUN Lihui , JIANG Jianhu . Dietary Copper Requirement of Juvenile Uriental River Prawn, Macrobrachium nipponense[J]. Chinese Journal of Animal Nutrition, 2014 , 26(6) : 1706 -1714 . DOI: 10.3969/j.issn.1006-267x.2014.06.036

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