Rice-fish co-culture has gained increasing attention to remediate the negative environmental impacts induced by intensive aquaculture. However, the effect of rice-fish co-culture on oxygen depletion has rarely been in...Rice-fish co-culture has gained increasing attention to remediate the negative environmental impacts induced by intensive aquaculture. However, the effect of rice-fish co-culture on oxygen depletion has rarely been investigated. We constructed a rice-fish co-culture system in yellow catfish(Pelteobagrus fulvidraco) and freshwater shrimp(Macrobrachium nipponense) ponds using a new high-stalk rice variety, and conducted a field experiment to investigate the effect of rice-fish co-culture on water parameters and oxygen consumption. The results showed that rice-fish co-culture reduced the nutrients(total nitrogen, ammonia-N, total phosphorous and potassium) and the dissolved oxygen content in fish and shrimp ponds. However, they showed similar seasonal change of dissolved oxygen in the water of fish and shrimp ponds. Rice-fish co-culture reduced the total amount of oxygen consumption and optimized the oxygen consumption structure in pond. The respiration rates in water and sediment were significantly reduced by 66.1% and 31.7% in the catfish pond, and 64.4% and 38.7% in the shrimp pond, respectively, by additional rice cultivation. Rice-fish co-culture decreased the proportions of respiration in sediment and water, and increased the proportion of fish respiration. These results suggest that rice-fish co-culture is an efficient way to reduce hypoxia in intensive culture pond.展开更多
将植物乳杆菌(Lactobacillus plantarum CD101)和模仿葡萄球菌(Staphylococcus simulans NJ201)作为功能性发酵剂接种发酵鱼肉香肠,并以自然发酵为对照,利用pH值、质构、色差、抗氧化能力、挥发性风味物质、游离氨基酸等指标,探究功能...将植物乳杆菌(Lactobacillus plantarum CD101)和模仿葡萄球菌(Staphylococcus simulans NJ201)作为功能性发酵剂接种发酵鱼肉香肠,并以自然发酵为对照,利用pH值、质构、色差、抗氧化能力、挥发性风味物质、游离氨基酸等指标,探究功能性发酵剂对发酵鱼肉香肠品质、风味及多肽抗氧化活性的影响。结果表明:接种功能性发酵剂能够使鱼肉香肠在发酵期间pH值迅速降低,具有更低的pH值,提高了香肠的稳定性和安全性;提高了香肠的硬度和咀嚼性、提升了亮度和色泽,使之拥有更好的品质;显著提高了香肠多肽对1,1-二苯基-2-三硝基苯肼自由基、2,2’-联氮双(3-乙基苯并噻唑啉-6-磺酸)阳离子自由基以及羟自由基的清除率,有助于香肠多肽抗氧化活性的提升;增加了酮类、酯类等风味物质的含量,丰富了香肠的风味,使其有更强烈的甜味和果香;促进了香肠中游离氨基酸的释放,这些氨基酸有利于香肠营养性、抗氧化能力、风味的提升。展开更多
以嗜盐古生菌TBN4(Halobacteriaceae sp.)、深红盐颗粒形菌RO2-11(Halogranum rubrum)和向烟氏盐微菌9738(Halomicrobium mukohataei)3株嗜盐古生菌为混合菌株发酵剂,以低值龙头鱼为原料,以氨基酸态氮含量、可溶性总氮含量、组胺含量、...以嗜盐古生菌TBN4(Halobacteriaceae sp.)、深红盐颗粒形菌RO2-11(Halogranum rubrum)和向烟氏盐微菌9738(Halomicrobium mukohataei)3株嗜盐古生菌为混合菌株发酵剂,以低值龙头鱼为原料,以氨基酸态氮含量、可溶性总氮含量、组胺含量、游离氨基酸总含量和有价值挥发性风味物质相对比例为指标,利用均匀设计方法对加盐量、发酵温度、发酵时间、接种量和添加3种菌的比例等参数进行优化。结果表明,利用上述3种嗜盐古生菌对龙头鱼发酵生产鱼露的最佳发酵条件为添加盐量15%、发酵温度42℃、发酵6个月、添加菌种量107CFU/m L、菌种比例3:1:1。氨基酸态氮含量、可溶性总氮含量、组胺含量、游离氨基酸总含量和有价值挥发性风味物质相对比例理论值分别为1.682 g/100 m L、3.615 g/100 m L、24.395 mg/100 m L、485.898 mg/100 m L和0.856。展开更多
基金supported by the Natural Science Foundation of China(Grant No.31400379)Natural Science Foundation of Zhejiang Province of China(Grant No.LY15C030002)Innovation Program of Chinese Academy of Agricultural Sciences
文摘Rice-fish co-culture has gained increasing attention to remediate the negative environmental impacts induced by intensive aquaculture. However, the effect of rice-fish co-culture on oxygen depletion has rarely been investigated. We constructed a rice-fish co-culture system in yellow catfish(Pelteobagrus fulvidraco) and freshwater shrimp(Macrobrachium nipponense) ponds using a new high-stalk rice variety, and conducted a field experiment to investigate the effect of rice-fish co-culture on water parameters and oxygen consumption. The results showed that rice-fish co-culture reduced the nutrients(total nitrogen, ammonia-N, total phosphorous and potassium) and the dissolved oxygen content in fish and shrimp ponds. However, they showed similar seasonal change of dissolved oxygen in the water of fish and shrimp ponds. Rice-fish co-culture reduced the total amount of oxygen consumption and optimized the oxygen consumption structure in pond. The respiration rates in water and sediment were significantly reduced by 66.1% and 31.7% in the catfish pond, and 64.4% and 38.7% in the shrimp pond, respectively, by additional rice cultivation. Rice-fish co-culture decreased the proportions of respiration in sediment and water, and increased the proportion of fish respiration. These results suggest that rice-fish co-culture is an efficient way to reduce hypoxia in intensive culture pond.
文摘将植物乳杆菌(Lactobacillus plantarum CD101)和模仿葡萄球菌(Staphylococcus simulans NJ201)作为功能性发酵剂接种发酵鱼肉香肠,并以自然发酵为对照,利用pH值、质构、色差、抗氧化能力、挥发性风味物质、游离氨基酸等指标,探究功能性发酵剂对发酵鱼肉香肠品质、风味及多肽抗氧化活性的影响。结果表明:接种功能性发酵剂能够使鱼肉香肠在发酵期间pH值迅速降低,具有更低的pH值,提高了香肠的稳定性和安全性;提高了香肠的硬度和咀嚼性、提升了亮度和色泽,使之拥有更好的品质;显著提高了香肠多肽对1,1-二苯基-2-三硝基苯肼自由基、2,2’-联氮双(3-乙基苯并噻唑啉-6-磺酸)阳离子自由基以及羟自由基的清除率,有助于香肠多肽抗氧化活性的提升;增加了酮类、酯类等风味物质的含量,丰富了香肠的风味,使其有更强烈的甜味和果香;促进了香肠中游离氨基酸的释放,这些氨基酸有利于香肠营养性、抗氧化能力、风味的提升。
文摘以嗜盐古生菌TBN4(Halobacteriaceae sp.)、深红盐颗粒形菌RO2-11(Halogranum rubrum)和向烟氏盐微菌9738(Halomicrobium mukohataei)3株嗜盐古生菌为混合菌株发酵剂,以低值龙头鱼为原料,以氨基酸态氮含量、可溶性总氮含量、组胺含量、游离氨基酸总含量和有价值挥发性风味物质相对比例为指标,利用均匀设计方法对加盐量、发酵温度、发酵时间、接种量和添加3种菌的比例等参数进行优化。结果表明,利用上述3种嗜盐古生菌对龙头鱼发酵生产鱼露的最佳发酵条件为添加盐量15%、发酵温度42℃、发酵6个月、添加菌种量107CFU/m L、菌种比例3:1:1。氨基酸态氮含量、可溶性总氮含量、组胺含量、游离氨基酸总含量和有价值挥发性风味物质相对比例理论值分别为1.682 g/100 m L、3.615 g/100 m L、24.395 mg/100 m L、485.898 mg/100 m L和0.856。
