排序方式： 共有8条查询结果，搜索用时 31 毫秒
1
1.
《African Zoology》2013,48(3):107-111
Enteromius mattozi Guimaraes, 1884, a popular eating fish among local people, were examined for monogenean parasites as part of a larger study to ascertain the feasibility of establishing aquaculture production in Limpopo, South Africa. In this study a new monogenean parasite of the genus Dactylogyrus was collected from the gills of E. mattozi, and described. It differs from known species of this group in the shape, size and structure of the heavily sclerotized vaginal prop. The proximal end of the vaginal prop has three layers similar to stacked funnels of decreasing sizes leading into a tube. The male copulatory organ is also much larger and robust than those of related species. The name Dactylogyrus mattozii is proposed for this new species. 相似文献
2.
3.
Roberto A R de Souza Wesley F da Annunciação Stephane M Lins Eduardo G Sanches Maurício L Martins Mônica Y Tsuzuki 《Aquaculture Research》2014,45(4):619-628
The interaction between cultured barber goby Elacatinus figaro (cleaner fish) and the dusky grouper Epinephelus marginatus, and the efficiency of the cleaner fish in removing ectoparasites were evaluated. When the interaction between these two species was observed, cleaner fish showed a preference for the largest groupers. In a second trial, treatments: TWC (Control) – two groupers without a cleaner fish, T1C – two groupers with one cleaner fish, T3C – two groupers with three cleaner fish and T6C – two groupers with six cleaner fish were tested in four replicates. After 8 days, monogeneans were removed and identified as Neobenedenia melleni. The highest mean abundance of parasites was found on the groupers in the TWC group (37 parasites per host) and the lowest on those in the T6C group (4.1 parasites per host). By increasing the number of cleaner fish, a higher cleaning efficiency was obtained, as observed in T6C, where almost 90% of the parasites were removed. Possibly, this removal would have been complete if the number of cleaners had not been reduced in the treatments due to the mortalities observed. This study demonstrates the possibility of using gobies to remove monogeneans and in improving grouper health. 相似文献
4.
5.
在乌鲁木齐市周边某大口黑鲈(Micropterus salmoides)养殖场采样过程中,采集到大口黑鲈鳃部一种单殖吸虫(monogenean),经过形态学初步鉴定,确定这一单殖吸虫为锚首虫科(Ancyrocephalidae)锁钩虫属(Onchocleidus Mueller)的异形锁钩虫(Onchocleidus dispar)。异形锁钩虫的特征主要为:背、腹中央大钩形态相似,但背中央大钩几乎是腹中央大钩的一倍,背联接片平直,两端膨胀呈圆形,有一细长、漏斗状的交接管,并在尖端末梢有点螺旋;附属片呈"钳形"。通过资料检索发现,异形锁钩虫在我国属首次报道,系我国新纪录属种。 相似文献
6.
【目的】建立活体杀灭鱼类单殖吸虫药物筛选及药效评价的方法。【方法】通过活体杀虫的方法,测试甲苯咪唑、吡喹酮对6种常见单殖吸虫(拟指环虫、坏鳃指环虫、中型指环虫、小鞘指环虫、鲢指环虫、伸展指环虫)的杀灭活性。首先用甲苯咪唑、吡喹酮、二硫氰基甲烷和氟甲砜霉素对试验鱼进行预处理,获得无虫鱼,以备感染试验用;然后对5种指环虫(坏鳃指环虫、中型指环虫、小鞘指环虫、鲢指环虫、伸展指环虫)进行纯化,再连同拟指环虫一并进行相应寄主感染试验,评价各种单殖吸虫的感染率和感染强度(以聚集指数表示);最后在不同的条件下对单殖吸虫进行活体保种试验,考察最佳的保种条件。【结果】自然条件下,寄生于金鱼的坏鳃指环虫、中型指环虫和寄生于欧洲鳗鲡的拟指环虫感染率均达到100%。药敏试验中,在相同质量浓度甲苯咪唑下,伸展指环虫、小鞘指环虫、坏鳃指环虫和鲢指环虫均比较敏感,在0.7mg/L时均被完全杀灭,中型指环虫和拟指环虫相对不敏感,在试验最高质量浓度0.8mg/L时仍未被完全杀灭,杀灭率分别为97.0%和90.5%;在相同质量浓度吡喹酮下,拟指环虫较其他5种指环虫更敏感,在2.2mg/L时即被完全杀灭,而中型指环虫、坏鳃指环虫、小鞘指环虫、鲢指环虫和伸展指环虫在试验最高质量浓度2.4mg/L时,仍未被完全杀灭,杀灭率分别为86.9%,82.7%,81.8%,81.4%和56.3%。感染试验中,拟指环虫对欧洲鳗鲡的感染率最高,达100%,聚集指数为5.9;其次是中型指环虫感染金鱼,感染率为97%,聚集指数为5.0。单殖吸虫保种试验表明,水温在20℃时各种单殖吸虫的感染率均能达到100%,且鱼的死亡率较低,是最佳的保种水温。【结论】选择体型小、价格低、易获得的金鱼及其寄生的中型指环虫作为药物筛选的指示生物,可进行杀灭鱼类单殖吸虫的药物筛选工作。 相似文献
7.
Bettina Schelkle Elizabeth L Richards Donna Snellgrove Jo Cable 《Aquaculture Research》2016,47(9):2928-2936
Infectious diseases are a major welfare issue, economically costly and, from a conservation perspective, threaten susceptible fish populations. Parasite control in aquaculture is over reliant on a limited range of treatments which tend to be low in efficacy, toxic to hosts and have negative consequences on human health and the environment. Here, we tested 22 botanical treatments alongside five controls against Gyrodactylus turnbulli (Harris 1986), in vitro and in vivo, infecting guppies (Poecilia reticulata Peters 1859). Survival of detached parasites was significantly reduced by all treatments with cajuput oil, bay rum oil, bladderwrack, octanoic acid, pine tree oil and barberry killing worms instantly. In vivo, cajuput oil applied with emulsifier was as effective as a licensed livestock dewormer, Levamisole, which is not routinely prescribed for use in fish; hence, cajuput can be considered for further research to replace Levamisole in UK research laboratories as well as in ornamental aquaculture. 相似文献
8.
Infections by the gill fluke Zeuxapta seriolae are a serious concern for sea cage aquaculture of kingfish, Seriola lalandi. The present study aimed to determine the pathophysiological effects of a progressive infection with Z. seriolae and the effects of treatment with hydrogen peroxide. For the progression of infection study, infected fish were taken from a sea cage farm, treated to remove parasites and then infected by cohabitation with heavily infected fish. Samples were taken at 2-week intervals for 8 weeks. Infection intensity peaked at 4 weeks post-infection (mean intensity 565.9) and the number of mature worms (2 mm fixed length or larger) peaked at 6 weeks post-infection. Attachment of Z. seriolae appeared to cause little localized pathology; however, the occurrence of hyperplastic lamellae increased as the infection progressed. Haemoglobin concentrations were negatively correlated with Z. seriolae intensity and were lower than controls at 4 weeks (35.8% decrease) and 6 weeks (57.4% decrease) post-infection. Blood lactate concentration and plasma osmolality increased throughout the course of infection. For the effect of treatment experiment, groups of infected and non-infected fish were sampled either before or after treatment with hydrogen peroxide. Treated fish from both infected and uninfected groups had increased plasma lactate, osmolality and pH compared with pre-treatment groups. Treatment with hydrogen peroxide appeared to have acute effects on fish health but the magnitude (e.g. lactate, osmolality) and extent of the effects (e.g. haemoglobin) was much less than that caused by chronic infection with Z. seriolae. 相似文献
1