Determination of the quality parameters of pike perch <Emphasis Type="Italic">Sander lucioperca</Emphasis> caught by gillnet,longline and harpoon in Turkey     

Gülsün Özyurt  Yesim Özogul  Caner Enver Özyurt  Abdurrahman Polat  Fatih Özogul  Cengiz Gökbulut  Beyza Ersoy  Esmeray Küley 《Fisheries Science》2007,73(2):412-420

ABSTRACT:   The effects of the different catching methods (gillnet, longline, harpoon) on sensory, chemical (pH, total volatile base nitrogen, K -value) and microbiological (total viable count [TVC]) changes in pike perch Sander lucioperca stored in ice were investigated. The same soaking time was used for both gillnet and longline fishing. The catching method had considerable influence on the freshness quality of pike perch. The acceptable shelf life was 15 days for pike perch caught by gillnet, and 22 days for longline and harpoon. The initial concentrations of inosine monophosphate (2.4 μmol/g) in pike perch caught by gillnet were significantly lower ( P  < 0.05) than longline (4.1 μmol/g), and especially by harpoon (16.7 μmol/g). However, the initial K -values for fish caught by harpoon were significantly ( P  < 0.05) lower (24.36%) than fish caught by longline and gillnet (57.69%, 64.41%, respectively). The average K , Ki, G and H -values at rejection day in terms of sensory assessment were approximately 90, 98, 156 and 40%, respectively, for all catching methods during ice storage. However, TVC reached 7.0 log cfu/g after approximately 11 days of storage for fish caught by gillnet, 19 days for fish caught by longline and 8 days for fish caught by harpoon. The result of this study suggests that the best catching method for preserving the freshness of pike perch is longline, based on the data obtained from the sensory and microbiological analysis.  相似文献   

Post-release movement and diel activity patterns of hatchery-reared and wild black-spot tuskfish <Emphasis Type="Italic">Choerodon schoenleinii</Emphasis> determined by ultrasonic telemetry     

Yuuki Kawabata  Junichi Okuyama  Hiromichi Mitamura  Kimio Asami  Kenzo Yoseda  Nobuaki Arai 《Fisheries Science》2007,73(5):1147-1154

ABSTRACT:   Post-release movement and diel activity patterns of hatchery-reared and wild black-spot tuskfish were examined using ultrasonic telemetry. Five hatchery-reared and four wild fish were released in the sandy bottom of Urasoko Bay, Ishigaki Island, Okinawa, Japan, and monitored using automated monitoring receivers from November 2005 to February 2006. Both hatchery-reared and wild fish tended to stay near the release site for over two weeks, before leaving the release site. Both hatchery-reared and wild tuskfish showed diurnal rhythm intermittently; signals were recorded more frequently in the daytime and less frequently in the nighttime, suggesting that the fish of both origins were active during the day and inactive during the night. These findings indicate that the one-year-old hatchery-reared tuskfish have some consistent behavioral characteristics with those of the wild.  相似文献   

Quantitative analysis of pattern of gonial proliferation during sexual maturation in Japanese scallop <Emphasis Type="Italic">Patinopecten yessoensis</Emphasis>     

Makoto Osada  Satoshi Nakamura  Akihiro Kijima 《Fisheries Science》2007,73(6):1318-1324

ABSTRACT:   This study was undertaken to describe and quantitatively analyze the pattern of development of gametes in the Japanese scallop Patinopecten yessoensis . Incorporation of 5-bromo-2'-deoxyuridine (BrdU) into gonial cells was used to quantitatively detect mitotically active gonial cells. Oogonia increased in number from November to December and decreased rapidly to March. A small number of oocytes was detected in November. Oocytes steadily increased in number and size up to March. The number of spermatogonia slightly increased from November to December, and increased markedly from January to March. Both ratios of BrdU-immunopositive gonial cells in the ovary and testis to gonial cells moderately increased from September to December. The ratio of BrdU-immunopositive spermatogonia to gonial cells drastically increased from January to February and kept an elevated level in March, whereas the oogonia started to disappear in January. The results suggest that the pattern of proliferation of gonial cells can be divided into two phases: (i) phase I, oogonia and spermatogonia slowly proliferate through the growing stage; and (ii) phase II, oogonia develop into oocytes and spermatogonia begin to proliferate rapidly through the mature and spawning stages. The proliferation of gonial cells is likely under different endocrine controls in phases I and II.  相似文献   

鱼在腌制过程中水份活度和有关参数的变化关系     

尹文娟  郭晓峰  包建强 《水产学报》1987,11(4):315-321

本文研究了腌制鱼的水分活度(Aw值)变化及其与其他有关参数的关系。以鲳鱼作为试验原料,用混合腌渍法对鱼品进行不同时间的腌制,然后观察鱼体中水分活度、盐分含量和水分含量的变化情况,并进一步探索这些参数之间相互的变化关系。实验结果表明,鱼体中水分活度和水分含量的降低,盐分的增加均在开始腌制至18小时时为最快;18小时后变化缓慢;34小时后基本趋向平衡。实验表明,水分活度,盐分含量与水分含量之间存在简单的线性关系,因此在腌制过程中,测定出水分和盐分含量就可以计算出水分活度Aw值,从而达到控制鱼品质量的目的。此方法在提高鱼品的保藏效果上具有一定的实用价值。  相似文献   

饵料种类和密度对毛蚶浮游幼虫生长的影响     

沈伟良  尤仲杰  施祥元 《河北渔业》2007,(9):18-20,23

通过投喂不同种类和不同浓度藻类对毛蚶浮游幼虫的生长进行了研究。结果表明在三种不同的单细胞藻类中湛江球等鞭金藻的效果最好,微绿球藻次之,而小球藻最差。在不同饵料浓度下,表明在初期投喂5×107L-1(cells/L)比较适宜,而后期以10×107L-1比较合适。  相似文献   

罗非鱼鱼种肠炎病的病理组织学及病原体的研究     

张晓君  田在滋 《河北渔业》1996,(5):5-7

本文从病理组织学的角度,研究了罗非鱼鱼种肠炎病的发生与发展,为其诊断与防治奠定了理论基础。结果表明,该病病原体为产气单胞菌。  相似文献   

宋庄镇创意休闲农业发展规划研究   总被引：1，自引：0，他引：1  

鲍顺淑  杜孝明  张秋玲  李淼  简保权 《农林科学实验》2014,(8):310-312

创意休闲农业是一种新型创意产业,它以农业资源为基础。将都市型现代农业与文化相结合,通过深度拓展农业功能,融合农业、科技、文化、创新等于一体而发展形成的满足特定市场需求的新兴产业。该文以北京市通州区宋庄镇为例,分析了宋庄镇创意休闲农业的发展条件,探讨了未来宋庄镇创意休闲农业的发展思路和布局,为宋庄创意休闲农业的特色化、品牌化发展提供建议。  相似文献   

Evaluation of cross-protection against three topotypes of serotype O foot-and-mouth disease virus in pigs vaccinated with multi-epitope protein vaccine incorporated with poly(I:C)     

Yimei Cao  Zengjun Lu  Dong Li  Pengju Fan  Pu Sun  Huifang Bao  Yuanfang Fu  Pinghua Li  Xingwen Bai  Yingli Chen  Baoxia Xie  Zaixin Liu 《Veterinary microbiology》2014,168(2-4):294-301

Epitope-based vaccines are always questioned for their cross-protection against the antigenically variable foot-and-mouth disease virus (FMDV). In this study, we proved the cross-protection effect of a multi-epitope vaccine incorporated with poly(I:C) against three topotypes of O type FMDV. A total of 45 naïve pigs were vaccinated with different doses of multi-epitope protein vaccine incorporated with poly(I:C). At 28 days post-vaccination, 45 vaccinated and 6 unvaccinated control pigs (two pigs for each group) were challenged with three topotypes of virulent O type FMDV, namely, O/Mya/98 (Southeast Asia topotype), O/HN/CHA/93 (Cathay topotype) and O/Tibet/CHA/99 (PanAsia topotype) strains. All unvaccinated pigs developed generalised FMD clinical signs. Results showed that all pigs (n = 15) conferred complete protection against the O/Mya/98 and O/HN/CHA/93 FMDV strains, 11 of which were protected against the O/Tibet/CHA/99 FMDV strain. The 50% protective dose values of the vaccine against the O/Mya/98, O/HN/CHA/93 and O/Tibet/CHA/99 FMDV strains were 15.59, 15.59 and 7.05, respectively. Contact challenge experiment showed that transmission occurred from the donors to the unvaccinated but not to vaccinated pigs. These results showed that vaccination with multi-epitope protein vaccine incorporated with poly(I:C) can efficiently prevent FMD in pigs.  相似文献   

柠檬酸、Nisin-檬酸联合对三种常见水产病原菌的作用     

石玉新马艳丽  齐树亭 《河北渔业》2006,(9):17-21

选用嗜水气单胞菌、副溶血弧菌、荧光假单胞菌三种常见水产病原菌，用于测定柠檬酸的抑菌效果及最小抑菌浓度，并研究了柠檬酸抑菌作用的稳定性。三种菌均为革兰氏阴性菌。试验结果表明，柠檬酸对三种菌都有不同程度的抑菌作用，并得到最小抑菌浓度，依次是：0．0011g／mL，0．0008g／mL，0．00125g／mL；在最小浓度下抑菌作用可达6d之久，柠檬酸抑菌效果有一定的稳定性。将Nisin溶于0．00125g／mL，得到复合液的抑菌效果强于柠檬裴单独作用，且稳定性增强。  相似文献   

毛蚶(Scapharaca subcrenata Lischke)人工育苗技术的初步研究     

蒋宏雷  施祥元  刘伟健 《现代渔业信息》2006,21(8):21-23,29

本文介绍毛蚶全人工育苗的过程和相关要点。亲贝通过蓄养促熟，经12h阴干、1h流水刺激可获催产成功；经选优、幼虫培育、附着基的选择和洗苗、疏苗等相关措施，在28-30℃，pH8．0-8．2，比重1．016-1．018条件下经40余天的培育获800～1．000um出池稚贝3．98亿。通过对无基质培育的试验，改变了毛蚶育苗模式，简化了生产程序。  相似文献