Dietary Protein Requirement of Juvenile Dianchi Golden‐line Barbell, Sinocyclocheilus grahami. Issue 4 (August 2014)

• Record Type: Journal Article
• Authors: Deng, Junming; Zhang, Xi; Han, Xuemei; Tao, Linli; Bi, Baoliang; Kang, Bin
• Is Part Of: Journal of the World Aquaculture Society. Volume 45:Issue 4(2014)
• Page Start: 421
• Page End: 429
• Publication Date: 2014-08
• Subjects: Aquaculture -- Periodicals; 639.8
• DOI: 10.1111/jwas.12137
• Languages: English
• ISSNs: 0893-8849

Abstract

<abstract abstract-type="main" id="jwas12137-abs-0001"> <title>Abstract</title> <p id="jwas12137-para-0001">A 10‐wk feeding trial was conducted to estimate the dietary protein requirements of juvenile Dianchi golden‐line barbell, <italic>Sinocyclocheilus grahami</italic> (initial average weight 7.55 g). Five isocaloric diets were formulated to contain graded levels of protein (29, 34, 39, 44, and 49%). Each diet was fed to triplicate groups of fish in a recirculating rearing system maintained at 18–22 C. Feed intake of fish fed the diet with 39% protein was significantly higher than those fed the diet with 29, 34, and 49% protein (<italic>P</italic> &lt; 0.05). Weight gain, specific growth rate (SGR), and protein gain significantly increased with increasing dietary protein levels up to 39% (<italic>P</italic> &lt; 0.05), whereas no significant differences were observed among fish fed the diet with 39, 44, and 49% protein (<italic>P</italic> &gt; 0.05). In contrast, feed conversion ratio was significantly decreased with increasing dietary protein levels up to 39%. Maximum protein retention and protein efficiency ratio were observed in fish fed the diet with 39% protein. The regression analysis based on SGR and protein gain showed that the dietary protein requirements of juvenile <italic>S. grahami</italic> were 38.57% or 41.09% (equivalent to ca. 32.94% or 35.42% estimated digestible protein) of diet with a calculated digestible energy of 3.6 kcal/g.</p> </abstract>