International Journal of Fisheries and Aquatic Studies
2020, Vol. 8, Issue 3, Part F
The response of juvenile largemouth bass (Micropterus salmoides) to varying protein and carbohydrate levels in extruded feed
Author(s): Zhou Fan, Chen Liupu, Peng Jian, Zhu Ningyu, Bei Yijiang, Xian Ting, Yao Gaohua, Ma Wenjun and Ding Xueyan
Abstract: The present feeding trial was conducted to evaluate the growth and physiological-biochemical indexes response of largemouth bass (
Micropterus salmoides) juvenile to varying protein and carbohydrate levels in extruded feed. Six experimental diets containing one of two carbohydrate (CHO) levels (10% or 13%) and three crude protein (CP) levels (42%, 45%, or 48%) were fed to three replicate groups of
M. salmoides (18.21 ± 0.03 g) for 56 days in indoor concrete ponds. The results show that fish fed 42% CP level diets had significantly lower WG and SGR than those of fish fed 48% CP level diets(
P<0.05), while there was no statistical difference between 45% and 48% CP levels diets (
P>0.05). No significant differences in growth were observed by increment of dietary CHO level from 10% to 13% (
P>0.05). Dietary 43% CP level increased feed conversion ratio (FCR) of fish when compared with 48% CP level treatment (
P<0.05), however, fish fed 45% CP with two CHO diets showed very comparatively values in FCR and protein efficiency ratio (PER) with 48% CP diets (
P>0.05). Hepatosomatic index of the experimental fish fed 13% CHO level was significantly higher than fish fed 10% CHO level (
P<0.05), while this parameter was not affected by dietary CP levels (
P>0.05). Dorsal muscle compositions of
M. salmoides were unaffected by dietary treatments with exception of the lower protein content in fish fed 42% CP level diets (
P<0.05). The highest GPT activity was observed in liver of
M. salmoides fed 48%CP13%CHO diet, while GPT level was enhanced by either dietary CP or CHO level (
P<0.05). High CP or CHO level in diets increased hepatic HK and PK activities, however, PEPCK activities were depressed by high CHO level diets. Pepsin activities in stomach of
M. salmoides fed 42% CP level diets were significantly lower, while amylase activities of fish fed 13% CHO level diets were significantly higher (
P<0.05). By overall consideration, extruded feed containing 45% CP with 10% or 13% CHO levels are applicable for
M. salmoides juveniles under the current trial conditions.
Pages: 466-473 | 607 Views 176 DownloadsDownload Full Article: Click Here
How to cite this article:
Zhou Fan, Chen Liupu, Peng Jian, Zhu Ningyu, Bei Yijiang, Xian Ting, Yao Gaohua, Ma Wenjun, Ding Xueyan. The response of juvenile largemouth bass (Micropterus salmoides) to varying protein and carbohydrate levels in extruded feed. Int J Fish Aquat Stud 2020;8(3):466-473.
