Effects of Dietary Iron Level on Growth Performance, Body Composition, Enzyme Activity and Tissue Iron Content of Juvenile Peanut Worm, Sipunculus nudus Linnaeus

XU Mingzhu, ZHANG Qin, TONG Tong, DONG Lanfang, YANG Jialin, JIANG Yan, HUANG Guoqiang

doi:10.3969/j.issn.1006-267x.2014.11.019

2014 , Vol. 26 >Issue 11: 3325 - 3331

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.11.019

Aquaculture Nutrition

Effects of Dietary Iron Level on Growth Performance, Body Composition, Enzyme Activity and Tissue Iron Content of Juvenile Peanut Worm, Sipunculus nudus Linnaeus

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Key Laboratory of Marine Biotechnology of Guangxi, Guangxi Institute of Oceanology, Beihai 536000, China

Received date: 2014-05-16

Online published: 2014-11-17

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Abstract

This trial was conducted to investigate the effects of dietary iron level on growth performance, body composition, enzyme activity and tissue iron content of juvenile peanut worm, Sipunculus nudus Linnaeus. Sipunculus nudus juveniles with average body weight of (16.11±0.09) mg were randomly divided into 6 groups with 3 replicates per group and 400 juveniles per replicate, and fed diets with six iron levels (11.2, 2.5, 61.3, 115.6, 283.7, 482.1 mg/kg, respectively) for 56 d. The results showed that the dietary iron levels had significant effects on weight gain rate (WGR), specific growth rate (SGR) and survival ratio (SR) of Sipunculus nudus (P<0.05). With the increasing of dietary iron level, WGR, SGR and SR trended to increase firstly and then decrease. The results of body composition analysis showed that dietary iron level had significant effects on body ether extract content (P<0.05). The body ether extract content trended to increase firstly and then decrease with the increasing of dietary iron level. No significant differences were observed in body moisture, crude protein and ash contents of Sipunculus nudus (P>0.05). Dietary iron level significantly affected catalase (CAT) activity of Sipunculus nudus (P<0.05). With the increasing of dietary iron level, the CAT activity was firstly increased and then tended to be stable. And dietary iron could be absorbed by Sipunculus nudus. In conclusion, the best dietary iron level which can acquire the best WGR is 115.6 mg/kg, and the dietary iron level 118.65 mg/kg can acquire the highest body iron content (233.85 μg/g).

Key words： Sipunculus nudus Linnaeus; iron level; growth performance; body composition; CAT; tissue iron content

Cite this article

XU Mingzhu, ZHANG Qin, TONG Tong, DONG Lanfang, YANG Jialin, JIANG Yan, HUANG Guoqiang . Effects of Dietary Iron Level on Growth Performance, Body Composition, Enzyme Activity and Tissue Iron Content of Juvenile Peanut Worm, Sipunculus nudus Linnaeus[J]. Chinese Journal of Animal Nutrition, 2014 , 26(11) : 3325 -3331 . DOI: 10.3969/j.issn.1006-267x.2014.11.019

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