Molecular Nutrition

Dietary Protein Requirement of Barbatula barbatula nuda Juvenile

  • HAN Ruzheng ,
  • LUO Xiaonian ,
  • HAN Yuzhe ,
  • LIU Zongying ,
  • XU Haoran ,
  • JIANG Xianghui
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  • 1. Freshwater Fisheries Research Academy of Liaoning Province, Liaoyang 111000, China;
    2. College of Fisheries and Life Sciences, Dalian Ocean University, Dalian 116023, China

Received date: 2016-06-24

  Online published: 2016-12-17

Abstract

A 60-day feeding trial was conducted to investigate the dietary protein requirement of Barbatula barbatula nuda juvenile. Fish meal, fermented soybean meal and casein were used as the protein sources to formulate 5 isolipidic and isocaloric experimental diets containing different protein levels of 22.85%, 31.09%, 40.72%, 47.21% and 54.08%, respectively. Triplicate tanks were assigned to each experimental diet, and 40 fish with initial body weight of (0.77±0.02) g were assigned to each tank (water body volume:80 cm×50 cm×20 cm). The result showed as follows:when dietary protein levels were 22.85% to 40.72%, the weight gain rate (WGR) and special growth rate (SGR) were significantly increased with the dietary protein level increasing (P<0.05), but continued to increase the dietary protein level, the WGR and SGR were significantly decreased (P<0.05). When dietary protein levels were 22.85% to 40.72%, the feed efficiency (FE) and survival rate (SR) showed increase trends with the dietary protein level increasing; when dietary protein levels were 40.72% to 54.08%, the FE and SR showed decrease trends with the dietary protein level increasing. The WGR, SGR FE and SR of Barbatula barbatula nuda juvenile reached the maximum values when dietary protein level was 40.72%. Condition factor (CF), viscerosomatic index (VSI), hepatosomatic index (HSI) and the contents of whole body moisture and crude protein were not significantly affected by dietary protein level (P>0.05). The crude lipid content of whole body was significantly decreased when dietary protein level was over 40.72% (P<0.05), it was decreased with the dietary protein level increased from 31.09% to 54.08%. Base on the quadratic regression equation of WGR and dietary protein level, dietary protein requirement of Barbatula barbatula nuda juvenile to reach the maximum growth rate is 41.57%.

Cite this article

HAN Ruzheng , LUO Xiaonian , HAN Yuzhe , LIU Zongying , XU Haoran , JIANG Xianghui . Dietary Protein Requirement of Barbatula barbatula nuda Juvenile[J]. Chinese Journal of Animal Nutrition, 2016 , 28(12) : 3905 -3911 . DOI: 10.3969/j.issn.1006-267x.2016.12.023

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