A 3-month enclosure experiment was carried out to examine the effects of different stocking (monoculture of freshwater pearl mussel Hyriopsis cumingii, polyculture of the pearl mussel and gibel carp Carassius auratus ...A 3-month enclosure experiment was carried out to examine the effects of different stocking (monoculture of freshwater pearl mussel Hyriopsis cumingii, polyculture of the pearl mussel and gibel carp Carassius auratus gibelio, and polyculture of the pearl mussel, silver carp Hypophthalmichthys molitrix and bighead carp Aristichthys nobilis) and management (fertilizing, combination of fertilizing and feeding) models on chemical water quality. During the experiment, mean value of dissolve oxygen (DO) in the enclosures was over 8.9 mg·L-1, and pH ranged from 6.99 to 10.69. The enclosures with monoculture of the pearl mussel had high DO and pH. Mean value of Ca2+, hardness and alkalinity in the enclosures ranged within 15.6-23.2 mg·L-1, 80.6-96.6 mg CaCO3·L-1 and 72.1-89.1 mg CaCO3·L-1, respectively. Mean value of nitrate (NO3-N), nitrite (NO2-N), ammonia (TAN), reactive phosphate (PO4-P), total nitrogen(TN) and total phosphorus (TP) ranged within 0.115-0.202 mg·L-1, 0.002 -0.005 mg·L-1, 0.088-0.163 mg·L-1, 0.018-0.055 mg·L-1, 1.906-2.989 mg·L-1 and 0.327-0.539 mg·L-1, respectively. There were no significant differences in NO3-N, NO2-N and TAN among the enclosures. High PO4-P occurred in the enclosures in which the pearl mussel and gibel carp were polycultured with fertilizing and feeding or the pearl mussel was monocultured with fertilizing. TN and TP were high in the enclosure in which the pearl mussel was monocultured with fertilizing and feeding. Mean value of (NO3-N+NO2-N+TAN )/PO4-P in each enclosure ranged from 9 to 18, and TN/TP from 6 to 8, respectively. No significant difference was found in ( NO3-N+NO2-N +TAN)/PO4-P and TN/TP among the enclosures. Mean value of chemical oxygen demand (CODMn ) ranged from 17.29 to 17.33 mg·L-1 in the enclosures of monoculture, and from 11.21 to 13.91 mg·L-1 in the enclosures of polyculture. TN and CODMn increased, while TP decreased, with advance of the experiment. Results of the present experiment indicate using different stocking and management models could not展开更多
为研究池塘和稻田养殖模式对全州禾花鲤(Cyprinus carpio var. Quanzhounensis)风味物质的影响,采用顶空固相微萃取法检测全州禾花鲤肌肉和肝胰腺中的E-2-壬烯醛、2-甲基异茨醇(2-MIB)和土臭素(GSM)的含量,以及利用高效液相色谱串联质...为研究池塘和稻田养殖模式对全州禾花鲤(Cyprinus carpio var. Quanzhounensis)风味物质的影响,采用顶空固相微萃取法检测全州禾花鲤肌肉和肝胰腺中的E-2-壬烯醛、2-甲基异茨醇(2-MIB)和土臭素(GSM)的含量,以及利用高效液相色谱串联质谱仪检测次黄嘌呤核苷酸(IMP)的含量,并进行比较分析。结果显示,在土腥味物质方面,稻田养殖模式下禾花鲤肌肉的2-MIB和GSM含量极显著高于池塘养殖模式,肝胰腺的E-2-壬烯醛和GSM含量极显著高于池塘养殖模式(P<0.01);在鲜味物质方面,稻田养殖模式下禾花鲤肌肉的IMP含量极显著高于池塘养殖模式(P<0.01),肝胰腺的IMP含量不存在显著差异(P>0.05)。综上所述,稻田养殖的全州禾花鲤鲜味更高,但土腥味更重;池塘养殖的全州禾花鲤土腥味淡,但鲜味不浓。展开更多
文摘A 3-month enclosure experiment was carried out to examine the effects of different stocking (monoculture of freshwater pearl mussel Hyriopsis cumingii, polyculture of the pearl mussel and gibel carp Carassius auratus gibelio, and polyculture of the pearl mussel, silver carp Hypophthalmichthys molitrix and bighead carp Aristichthys nobilis) and management (fertilizing, combination of fertilizing and feeding) models on chemical water quality. During the experiment, mean value of dissolve oxygen (DO) in the enclosures was over 8.9 mg·L-1, and pH ranged from 6.99 to 10.69. The enclosures with monoculture of the pearl mussel had high DO and pH. Mean value of Ca2+, hardness and alkalinity in the enclosures ranged within 15.6-23.2 mg·L-1, 80.6-96.6 mg CaCO3·L-1 and 72.1-89.1 mg CaCO3·L-1, respectively. Mean value of nitrate (NO3-N), nitrite (NO2-N), ammonia (TAN), reactive phosphate (PO4-P), total nitrogen(TN) and total phosphorus (TP) ranged within 0.115-0.202 mg·L-1, 0.002 -0.005 mg·L-1, 0.088-0.163 mg·L-1, 0.018-0.055 mg·L-1, 1.906-2.989 mg·L-1 and 0.327-0.539 mg·L-1, respectively. There were no significant differences in NO3-N, NO2-N and TAN among the enclosures. High PO4-P occurred in the enclosures in which the pearl mussel and gibel carp were polycultured with fertilizing and feeding or the pearl mussel was monocultured with fertilizing. TN and TP were high in the enclosure in which the pearl mussel was monocultured with fertilizing and feeding. Mean value of (NO3-N+NO2-N+TAN )/PO4-P in each enclosure ranged from 9 to 18, and TN/TP from 6 to 8, respectively. No significant difference was found in ( NO3-N+NO2-N +TAN)/PO4-P and TN/TP among the enclosures. Mean value of chemical oxygen demand (CODMn ) ranged from 17.29 to 17.33 mg·L-1 in the enclosures of monoculture, and from 11.21 to 13.91 mg·L-1 in the enclosures of polyculture. TN and CODMn increased, while TP decreased, with advance of the experiment. Results of the present experiment indicate using different stocking and management models could not
文摘为研究池塘和稻田养殖模式对全州禾花鲤(Cyprinus carpio var. Quanzhounensis)风味物质的影响,采用顶空固相微萃取法检测全州禾花鲤肌肉和肝胰腺中的E-2-壬烯醛、2-甲基异茨醇(2-MIB)和土臭素(GSM)的含量,以及利用高效液相色谱串联质谱仪检测次黄嘌呤核苷酸(IMP)的含量,并进行比较分析。结果显示,在土腥味物质方面,稻田养殖模式下禾花鲤肌肉的2-MIB和GSM含量极显著高于池塘养殖模式,肝胰腺的E-2-壬烯醛和GSM含量极显著高于池塘养殖模式(P<0.01);在鲜味物质方面,稻田养殖模式下禾花鲤肌肉的IMP含量极显著高于池塘养殖模式(P<0.01),肝胰腺的IMP含量不存在显著差异(P>0.05)。综上所述,稻田养殖的全州禾花鲤鲜味更高,但土腥味更重;池塘养殖的全州禾花鲤土腥味淡,但鲜味不浓。
