文献类型： 外文期刊

作者： Xu, Wu-Jie ¹ ; Morris, Timothy C. ⁴ ; Samocha, Tzachi M. ⁵ ;

作者机构： 1.Minist Agr, Key Lab South China Sea Fishery Resources Exploit, Guangzhou 510300, Guangdong, Peoples R China

2.Key Lab Fishery Ecol & Environm, Guangzhou, Guangdong, Peoples R China

3.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Guangzhou 510300, Guangdong, Peoples R China

4.Texas A&M AgriLife Res Mariculture Lab Flour Bluf, Corpus Christi, TX 78418 USA

5.Marine Solut & Feed Technol, Spring, TX 77386 USA

关键词： C/N ratio; Feed; Biofloc-based system; Water quality; Shrimp performance; Litopenaeus vannamei

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

ISSN： 0044-8486

年卷期： 2018 年 490 卷

页码：

收录情况： SCI

摘要： A two-factor experiment was conducted to evaluate the effects of two commercial shrimp feeds and four different C/N ratios on biofloc development, water quality, growth performance, feed utilization and input cost in an outdoor tank system stocked with Litopenaeus vannamei juveniles under high-density and zero-exchange conditions. The two feeds used in the study were:a less expensive feed (US$0.99 kg(-1)) formulated for semi-intensive production systems and a more expensive one (US$1.75 kg(-1)) designed for hyper-intensive systems. Organic carbon (molasses) was added daily to provide calculated carbon to nitrogen (C/N) ratios of 12:1, 15:1, and 18:1 based on the carbon-nitrogen content of the feed and the carbon content of the molasses throughout the experiment. No molasses was added in the control group which had a C/N ratio of 9:1. Each treatment had four randomly assigned replicate tanks, and each tank filled with 500 L of biofloc-rich water. Juvenile shrimp (2.21 +/- 0.11 g) were stocked into tanks at 150 shrimp tank(-1) (300 juvenilesm(-3)) and cultured for six weeks. The results showed that both feed and C/N ratio had significant effects on biofloc development, water quality, shrimp performance, feed utilization and input cost. Initiating the culture with biofloc-rich water and then adding a small amount of organic carbon regularly could effectively sustain the continued development of mixotrophic bioflocs in zero-exchange high-density shrimp culture systems. The best water quality, shrimp performance, and FCR results were achieved with the C/N ratio of 12:1 for both feeds. Analysis of feed and variable costs suggest improved economic benefits when using the less expensive feed of SI-35 under the conditions of this study. Furthermore, input costs could be decreased using a C/N ratio of 12:1 due mainly to reduced molasses and NaHCO3 usage.