Fish Pathology最新文献_第7页

On the Skin Flukes Found in Farmed Thunnus orientails 养殖黄鳝皮肤吸虫的研究

IF 0.6 4区农林科学

Fish Pathology Pub Date : 2020-09-15 DOI: 10.3147/jsfp.55.88

引用次数: 0

Different Virulence of Flavobacterium psychrophilum Isolates in Two Stocks of Ayu Plecoglossus altivelis 两种阿育鱼种群嗜冷黄杆菌分离株的毒力差异

IF 0.6 4区农林科学

Fish Pathology Pub Date : 2020-09-15 DOI: 10.3147/jsfp.55.71

T. Nagai, T. Nakai

引用次数: 0

Subsequent Changes in the Thymus of Ayu Plecoglossus altivelis Reared from Juveniles with Temperature-induced Differential Thymus Growth 温度诱导的不同胸腺生长幼畜胸腺的后续变化

IF 0.6 4区农林科学

Fish Pathology Pub Date : 2020-06-15 DOI: 10.3147/jsfp.55.31

Yuzo Takada, K. Taguchi, Kyuma Suzuki, A. Ashizawa, K. Kaji, Shun Watanabe, S. Wada, O. Kurata

{"title":"Subsequent Changes in the Thymus of Ayu Plecoglossus altivelis Reared from Juveniles with Temperature-induced Differential Thymus Growth","authors":"Yuzo Takada, K. Taguchi, Kyuma Suzuki, A. Ashizawa, K. Kaji, Shun Watanabe, S. Wada, O. Kurata","doi":"10.3147/jsfp.55.31","DOIUrl":"https://doi.org/10.3147/jsfp.55.31","url":null,"abstract":"― The temperature of water used to rear juvenile stages of ayu affects the development of the thymus. However, subsequent differences in the thymus in adults after rearing juveniles at different temperatures are unclear. We analyzed thymus development of ayu grown at a constant water temperature of 15 ° C from juveniles reared at different water temperatures. Juvenile ayu weighed at 0.6 g and 1.4 g were reared at different temperatures (10 ° C, 12 ° C, 15 ° C, 18 ° C and 22 ° C) for 64 days and 54 days, respectively, and then held at 15 ° C for analysis of the thymus development. Thymus volume was measured by computed tomography and thymus development of experimental ﬁsh was evaluated as the ratio of thymus volume to body length. The thymus volume ratios of juveniles immediately after rearing at lower water temperatures (10 ° C, 12 ° C) were higher than in those reared at the higher temperatures (18 ° C, 22 ° C). These levels of thymus volume ratio were preserved in grown ayu continuously reared at 15 ° C. After the summer solstice, the thymus began to atrophy and no longer exhibited differences among the experimental groups. Thus the thymus formed at the juvenile stage retains its morphological properties until the summer solstice.","PeriodicalId":51052,"journal":{"name":"Fish Pathology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88685439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Detection of Flavobacterium psychrophilum in Adult Chum Salmon and Prevention of Vertical Transmission in a Hatchery 成鱼嗜冷黄杆菌的检测及孵化场垂直传播预防

IF 0.6 4区农林科学

Fish Pathology Pub Date : 2020-06-15 DOI: 10.3147/jsfp.55.42

Toshimasa Kobayashi, N. Takahashi

引用次数: 0

Control of the Daily Rhythms by Photoperiods in Protomont Detachment and Theront Excystment of the Parasitic Ciliate Cryptocaryon irritans 光周期对寄生纤毛虫隐孢子虫包囊前脱落和囊前分泌的控制

IF 0.6 4区农林科学

Fish Pathology Pub Date : 2020-06-15 DOI: 10.3147/jsfp.55.38

Yuho Watanabe, Kah Hui How, Kosuke Zenke, N. Itoh, T. Yoshinaga

引用次数: 7

Bacterial Hemolytic Jaundice 细菌性溶血性黄疸

IF 0.6 4区农林科学

Fish Pathology Pub Date : 2020-06-15 DOI: 10.3147/jsfp.55.25

T. Takano, T. Matsuyama

引用次数: 0

Prevalence of Infection with Nocardia seriolae in Juvenile of Yellowtail Seriola quinqueradiata Cultured in Owase Bay, Japan 日本奥濑湾养殖的五角黄尾七叶鳗幼鱼感染诺卡菌的流行情况

IF 0.6 4区农林科学

Fish Pathology Pub Date : 2020-03-15 DOI: 10.3147/jsfp.55.1

G. Kato, Kensuke Oka, M. Matsumoto, Motohisa Kanemaru, Masato Yamamoto, M. Sano

{"title":"Prevalence of Infection with Nocardia seriolae in Juvenile of Yellowtail Seriola quinqueradiata Cultured in Owase Bay, Japan","authors":"G. Kato, Kensuke Oka, M. Matsumoto, Motohisa Kanemaru, Masato Yamamoto, M. Sano","doi":"10.3147/jsfp.55.1","DOIUrl":"https://doi.org/10.3147/jsfp.55.1","url":null,"abstract":"Nocardiosis caused by Nocardia seriolae makes severe losses of fish production of Seriola spp. in Japan. In this study, we investigated prevalence of N. seriolae infection in yellowtail Seriola quinqueradiata cultured in an open sea net-cage in Owase Bay, Japan. The gills, serum and spleen were sampled from juvenile fish (n = 5) on May, June, July, August, November 2017 and January 2018. Serum antibody titer against N. seriolae were significantly increased on November 2017 and January 2018. N. seriolae 16S rRNA gene were detected by PCR in the spleen and/or gills of 1–4 individuals sampled on May, July, August, November 2017 and January 2018, while the bacterium was not isolated from any individuals on Ogawa medium. Granulomatous inflammation which is the typical characteristic of pathological feature of nocardiosis was not observed in any spleen sections examined. However, fluorescent immunohistochemistry with anti-N. seriolae rabbit serum detected the longand short-rod shaped bacteria in the spleen of all fish examined in this study. These data suggest that the juvenile yellowtail cultured in Owase Bay had been already infected with N. seriolae even in May. In addition, N. seriolae may be in viable but non-culturable state (VBNC), resulting in latent infection in cultured yellowtail.","PeriodicalId":51052,"journal":{"name":"Fish Pathology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78061303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Comparative Analysis of Plasmid DNAs from Two Strains of Photobacterium damselae subsp. piscicida Isolated from Japan and the United States 两株少女光杆菌质粒dna的比较分析。从日本和美国分离的鱼尾虫

IF 0.6 4区农林科学

Fish Pathology Pub Date : 2020-03-15 DOI: 10.3147/jsfp.55.18

Akito Tsuchiya, Aki Nishihara, A. Saeki, Yuki Teru, T. Aoki, T. Kono, M. Sakai, J. Hikima

引用次数: 1

Ultrastructural and Molecular Phylogenetic Identification of the Diplomonad Flagellate Spironucleus salmonis Infecting Hatchery-reared Salmonid Fishes in Hokkaido 北海道孵化场养殖鲑科鱼类感染双鞭毛螺旋体的超微结构及分子系统发育鉴定

IF 0.6 4区农林科学

Fish Pathology Pub Date : 2020-03-15 DOI: 10.3147/jsfp.55.8

S. Mizuno, S. Urawa, Yoshitomo Katsumata, T. Morishita, M. Ban

{"title":"Ultrastructural and Molecular Phylogenetic Identification of the Diplomonad Flagellate Spironucleus salmonis Infecting Hatchery-reared Salmonid Fishes in Hokkaido","authors":"S. Mizuno, S. Urawa, Yoshitomo Katsumata, T. Morishita, M. Ban","doi":"10.3147/jsfp.55.8","DOIUrl":"https://doi.org/10.3147/jsfp.55.8","url":null,"abstract":"― Systemic infections caused by diplomonad ﬂagellates belonging to the genus Spironucleus commonly result in heavy mortalities in salmonids. Diplomonad ﬂagellates were found in the intestinal lumen of hatchery-reared juvenile chum Oncorhynchus keta and masu salmon O. masou in Hokkaido. We performed ultrastructural observation and molecular phylogenetic analysis using the small subunit ribosomal RNA gene (SSUrDNA) of the ﬂagellates to clarify their taxonomy. The ﬂagellates showed elongated and tapered nuclei, and sub-apical location of the kinetosomes relative to the nuclei: which are the distinguishing characters of the genus Spironucleus among three genera of parasitic diplomonads. In addition, the ﬂagellates had electron dense plaques at their posterior end, a posterior sac of dense free ribosomes, an electron dense body, and bowl-shaped membranous structures, identifying them as S. salmonis among four Spironucleus species that affect fish. The ultrastructure of the flagellates showed no variations between the two host species of salmon. All the isolated ﬂagellate SSUrDNAs had the same 1,031 bp sequence, and no difference in the sequence. The SSUrDNA showed the highest homology (99%) with S. salmonis among 11 diplomonad ﬂagellates. Thus, this study successfully used ultrastructure diagnosis and molecular phylogenetic analysis to conﬁrm S. salmonis as the diplomonad ﬂagellate that has infected hatchery-reared chum and masu salmon in Hokkaido.","PeriodicalId":51052,"journal":{"name":"Fish Pathology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74514422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bucephalid Metacercarial Infection in Wild Larval and Juvenile Ayu Plecoglossus altivelis 野生阿育银舌鱼幼鱼双头蚴感染的研究

IF 0.6 4区农林科学

Fish Pathology Pub Date : 2020-01-15 DOI: 10.3147/jsfp.54.93

S. Shirakashi, Tsukasa Waki, K. Ogawa

{"title":"Bucephalid Metacercarial Infection in Wild Larval and Juvenile Ayu Plecoglossus altivelis","authors":"S. Shirakashi, Tsukasa Waki, K. Ogawa","doi":"10.3147/jsfp.54.93","DOIUrl":"https://doi.org/10.3147/jsfp.54.93","url":null,"abstract":"Ayu Plecoglossus altivelis is a native amphidromous fish in Japan and an important target for farming and recreational fishing. We have found high infection of hitherto unknown digenean metacercariae in wild ayu larvae and juveniles captured from the sea and a river in Wakayama Prefecture. The infection prevalence was 95% and 100% in larvae and juvenile ayu, respectively with variable intensities up to 566 metacercariae per fish. The metacercariae were located primarily around fins and inside caudal fins, but appeared to cause no serious pathological features to the fish. The phylogenetic analysis based on the internal transcribed spacer 2 and 28S rDNA sequences revealed its identity as a member of Bucephalinae (Bucephalidae) with no identical genetic information on the database. Morphological characteristics of the larval trematode resembled those of the genus Prosorhynchoides. Genetically identical metacercariae were also found from Scomber japonicus and Engraulis japonicus captured at the same location as P. altivelis with variable infection levels, which suggested that it was a marine species. Experimental infection challenge of the metacercariae to several marine fish via oral intubation failed to obtain adult specimen and thus the precise identification of the parasite remains unknown.","PeriodicalId":51052,"journal":{"name":"Fish Pathology","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75474393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3