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<正> 近十年来,我国水产业成为大农业中发展最快的行业之一,1988年水产品总量首次突破1000万吨大关,但目前我国鲜鱼供应的流通方式主要还是现捕现卖,货架寿命只能以小时计,这种小生产方式在经济发达的地区是难以长期维持下去的。它不能适应渔业生产的集约化,更不能满足人们对食品营 相似文献
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为探究不同分子量 (50、200和500 kD) 壳聚糖涂膜对冷藏草鱼 (Ctenopharyngodon idella) 鱼片品质保持效果的差异性,比较了不同涂膜保鲜样品贮藏期间的感官评分、微生物计数 [菌落总数和假单胞菌(Pseudomonas)数] 和理化指标 [剪切力、汁液流失率、pH、挥发性盐基氮 (TVB-N)、TCA-溶解肽和生物胺] 的变化情况。结果表明,相较于对照组,3组壳聚糖涂膜处理均能有效抑制鱼肉品质劣化。结合感官评价、TVB-N与菌落总数分析结果,对照组样品冷藏货架期少于6 d,而涂膜处理能使产品货架期延长2 d以上,其中200 kD分子量壳聚糖涂膜鱼片贮藏期间的感官品质保持最佳,货架期延长效果更为明显。通过比较3组涂膜样品的微生物和理化指标,200 kD分子量壳聚糖涂膜鱼片在贮藏第8天时的菌落总数 (TVC)、假单胞菌数、剪切力、汁液流失率、TVB-N和腐胺含量等品质指标均优于另两组涂膜样品,200 kD分子量壳聚糖可作为优选的涂膜基料用于生鲜鱼肉的保鲜。 相似文献
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本文主要介绍鱼类和水产品腐败的原因及其保鲜保活技术、鱼品加工厂所进行灭菌消毒的各项切实可行的措施,文中述及使用抗生素保鲜保活试验的过去以及用TIMSEN保鲜保活的效用、用臭氧等物理方法保鲜技术的现状,文中最后述及用聚合磷酸盐提高冷冻鱼品和罐头鱼品质量的效用以及微冻保鲜技术。 相似文献
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鱼类,肉质细嫩,味道鲜美,营养丰富(含蛋白质15-20%,并含有人体所必须的八种氨基酸),容易被消化吸收,因而是深受人们喜爱的佳肴。但是,鱼体内含水份多(含水量80%左右),肌肉组织脆弱,酶类的活性强,体表被覆的粘液以及鳃部、肠道又极易沾染细菌。所以比起陆生动物来,鱼类特别容易腐败变质。这给鱼类保鲜工作造成很大困难。 相似文献
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防腐冰对鱼类保鲜效果研究↑(*) 总被引:1,自引:0,他引:1
防腐冰是水中添加防腐剂制成的,它能够增强对鱼在冰鲜期间的保藏效果。本文采用感官检定和TVB-N等鲜度指标,研究了几种Na_2-EDTA冰和苯甲酸钠冰对鲅鱼和带鱼的保鲜效果。结果表明:(1)1‰Na_2-EDTA冰具有较稳定、持久的抑菌效果,能有效地延缓鱼品感官质量下降和TVB-N上升,冰藏8天的带鱼细菌数,普通冰组为3.7×10 ̄5个/g,而1‰。Na_2-EDTA,冰组仅为2.1×10 ̄4个/g。(2)以感官检定80分为基准,与使用普通冰相比,使用1‰Na_2-EDTA冰保鲜鲅鱼,保藏期由116hr提高到140hr,保鲜带鱼,保藏期由104hr提高到164hr。 相似文献
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A jet fish pump with a throat of ø60 mm was designed to study its performance in the transport of different fish species and the physiological changes in fish thereafter. Experiments were conducted to investigate the fish transport rate and energy required to transport each ton of fish when transporting Carassius auratus, commonly known as the Chinese goldfish, Megalobrama amblycephala, or Wuchang bream, and Ctenopharyngodon idella, the grass carp. Fish were examined for external injuries as well as for several important enzymes and hormones which are indicators of tissue injury and stress. The results showed that the transport rate for all three species of fish rose dramatically with an increase in the primary stream rate. In this experiment, the transport rates of C. auratus, M. amblycephala and C. idella reached 2357 ± 37.2 kg ∙ h−1, 2888 ± 41.6 kg ∙ h−1, and 2060 ± 40.2 kg ∙ h−1, respectively. However, both injury rate and energy required to transport each ton of fish increased no matter whether the primary stream rate was too low or too high. Considering both transport rate and injury rate, the mean primary stream rate of 80 m3 ∙ h−1 was determined to be the optimal operating condition in this experiment. Fish were stressed and most likely some of their organs were damaged. However, most physiological indexes almost fully recovered after several hours. 相似文献
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In marine aquaculture, fish populations constantly decrease throughout the cultivation period because of mortality and escape. Current production management systems provide limited opportunities to count the cultured fish, making it difficult to estimate accurately the fish population in the cage. To overcome this problem, an automatic fish identifying method based on particle tracking velocimetry (PTV) flow visualization technology is proposed in this paper. The proposed method utilizes an image processing unit that extracts individual fish from the acquired image and a motion analysis unit that calculates the motion vector for each individual. Thus, the accuracy of the extraction results in the image processing unit affects the system’s counting results. To validate the efficiency and robustness of the image extraction performed by the image processing unit, individuals were extracted from images using the open-source image deep learning semantic segmentation method (SegNet), which is able to distinguish between the background and foreground in the images via analysis at the pixel level. SegNet is able to improve the image discrimination performance by multiplying the learning paths, and the robustness of the detection results can be ensured by changing the layer structure according to the detection target. Accordingly, the use of SegNet was evaluated in terms of the number of layers and images in the training set. The results of this study indicate that the application of SegNet with PTV technology represents a promising method for the automatic identifying and behavioral tracking of fish in an aquaculture net cage. 相似文献
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