两种养殖方式对高白鲑冷藏品质的影响

Effects of Two Culture Systems on Quality Changes of Coregonus peled During Chilled Storage

目的:探究高白鲑在恒温循环水养殖(CTRAS)和流水槽养殖(FAS)2种不同的养殖条件下,生长160 d后尾重和体长的差别以及鱼肉冷藏品质差异。方法:将2种养殖方式的高白鲑在4℃下分别贮藏0、2、4、6 d,测定它们的pH、挥发性盐基氮(TVBN)、硫代巴比妥酸(TBA)、质构特性、色泽变化、菌落总数(TVC)。结果:恒温循环水和流水槽养殖的高白鲑,尾重分别为43.27、11.64 g,体长分别为17.50、12.05 cm。恒温循环水和流水槽养殖的高白鲑肌肉在4℃冷藏期间,pH均呈现先下降再上升的趋势。TVBN、TBA、TVC均呈现持续上升的趋势,质构特性呈现下降的趋势,色泽呈现暗淡的趋势。结论:流水槽养殖条件下的高白鲑生长速度慢,鱼肉在冷藏初期硬度、弹性和咀嚼性都高于恒温循环水养殖的高白鲑,但随着冷藏时间的延长,口感和质地等品质明显下降。而恒温循环水养殖的高白鲑生长速度快,冷藏过程中鱼肉蛋白质降解产生不良物质较少,脂肪氧化、质构特性的变化小,更适合在冷藏条件下的保存与运输。

Objective The difference in tail weight and body length and quality changes of two systems cultured Coregonus peled(160 days)were compared during chilled storage.Method Two culture systems included constant temperature recirculating aquaculture system(CTRAS)and flume aquaculture system(FAS).The pH value,total volatile basic nitrogen(TVBN),thibarbituric acid(TBA),texture properties,color,and total viable count(TVC)were tested during chilled storage at the 0,2 rd,4 th and 6 th day.Result The weight of CTRAS and FAS samples were 43.27 g and 11.64 g,respectively.The length of CTRAS and FAS samples were 17.50 cm and 12.05 cm,respectively.During the chilled storage,the pH of both two cultured samples showed a downward and then upward trend The TVBN,TBA and TVC showed a trend of continuous increase,while the texture showed a trend of decline and the color showed a trend of dim.Conclusion The growth rate of Covegonus peled in FAS is slow,and the initial hardness,elasticity and chewability of samples were higher than that of CTRAS.However,the original taste and texture had decreased significantly with the extension of chilled storage.Compared with FAS,the grow rate of CTRAS was high.In addition,the CTRAS changes of protein degradation products,lipid oxidation,and texture characteristics were less than FAS during chilled storage.In conclusion,the CTRAS cultured samples were more suitable for preservation and transportation.