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Dietary protein requirement for juvenile Chinese sucker ( Myxocyprinus asiaticus )
Author(s) -
Zhang G.,
Gong S.,
Yuan Y.,
Chu Z.,
Yuan H.
Publication year - 2009
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.2009.01280.x
Subject(s) - biology , dietary protein , net protein utilization , juvenile , zoology , protein efficiency ratio , sucker , fish meal , feed conversion ratio , weight gain , protein requirement , body weight , fish <actinopterygii> , endocrinology , fishery , anatomy , ecology
Summary This study was conducted to determine the dietary protein requirement for juvenile Chinese sucker, Myxocyprinus asiaticus . Six fishmeal‐based experimental diets containing various crude protein levels ranging from 300 to 500 g kg −1 were fed to triplicate groups of 20 fish each (initial weight 13.5 ± 1.1 g) for 56 days at a temperature of 28 ± 1°C (tank size 400 × 45 × 40 cm, linked to a recirculation system). Survival was not affected by dietary protein level (overall survival 71 to 90%). Weight gain (WG) and specific growth rate (SGR) increased with an increasing dietary protein level up to 460 g kg −1 . The feed conversion rate (FCR) generally showed a decline at higher protein levels (from 1.62 in 300 g protein kg −1 to 1.13 in 500 g protein kg −1 feed). Protein efficiency ratio (PER) showed gradual improvements with increasing dietary protein up to 460 g kg −1 . A similar trend was found for the protein productive value (PPV). Among the proximate compositions of the fish, crude protein content increased significantly with increasing dietary protein levels. Based on broken‐line regression analysis of SGR against dietary protein levels, the optimal dietary protein requirement for juvenile Chinese sucker was estimated to be close to 465 g kg −1 .