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Hemaprasanth Singh R Raghavendra A Sridhar N Raghunath MR Eknath AE 《Veterinary parasitology》2011,178(1-2):156-162
Study was conducted to find out the comparative susceptibility of fingerlings of seven species of carps (Labeo fimbriatus, L. rohita, L. calbasu, Catla catla, Ctenopharyngodon idella, Cyprinus carpio and Hypophthamichthys molitrix) grown under both mono and polyculture to Lernaea cyprinacea infection. Under monoculture, C. carpio, L. rohita and L. calbasu, did not acquire Lernaea infection and were thus considered resistant, whereas C. idella, H. molitrix, C. catla and L. fimbriatus were susceptible. Even challenge with higher infective doses of copepodids under monoculture did not result in infection in the resistant fish species. The resistance of L. rohita and C. carpio to Lernaea infection under monoculture was not sustained when these two fish species were maintained in polyculture along with susceptible fish species. Labeo calbasu, even under polyculture, however, did not acquire Lernaea infection indicating that this fish species is the most resistant and least preferred host for this parasite. Similarly, C. carpio, L. rohita and L. calbasu when grown together in polyculture and exposed to a higher infective dose (120 copepodids/fish) also did not develop the infection. The possible reasons for differences in susceptibility shown by these carp species in monoculture and the loss of resistance by rohu and common carp while in polyculture with susceptible species are discussed. The ability of resistant fish species to prevent establishment of anchor worms on them under monoculture can be utilized to control this parasitic infection commonly encountered in culture ponds. 相似文献
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The immune response in rohu,Labeo rohita (Actinopterygii: Cyprinidae) to Argulus siamensis (Branchiura: Argulidae) infection: kinetics of immune gene expression and innate immune response 
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下载免费PDF全文 Banya Kar Jyotirmaya Mohanty K P Hemaprasanth Pramoda Kumar Sahoo 《Aquaculture Research》2015,46(6):1292-1308
Argulus siamensis is a major pathogen in freshwater aquaculture. The immune responses of Indian major carp, Labeo rohita to experimental infection of A. siamensis was evaluated by quantitation of immune‐relevant gene expression in head kidney and skin, and serum innate immune parameters through the course of infection. In skin of infected fish, antioxidant genes like natural killer cell enhancing factor (NKEF‐B) and superoxide dismutase (MnSOD) were significantly up‐regulated in addition to lysozyme G and β2 microglobulin (β2M). Both tumour necrosis factor α (TNFα) and toll‐like receptor 22 (TLR22) genes were significantly down‐regulated in skin during early phases of the infection. Most of the genes exhibited significant down‐regulation in head kidney; immunoglobulin (IgM) and β2M genes being the exceptions which were significantly up‐regulated at 12 h and 3 days post infection. Most of the innate immune parameters like serum complement activity and ceruloplasmin levels showed significant reduction in infected fish. The observed results are indicative of A. siamensis modulating the immune response of rohu by down‐regulation of many immune factors which may explain the susceptibility of rohu to A. siamensis infection. The interaction of this parasite with the host need to be further explored to understand its pathogenesis. 相似文献
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Veterinary Research Communications - 相似文献
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Hemaprasanth KP Raghavendra A Singh R Sridhar N Raghunath MR 《Veterinary parasitology》2008,156(3-4):261-269
Efficacy of doramectin administered via oral and parenteral routes against experimentally induced and natural infections of the copepod parasite Lernaea cyprinacea in carps was studied. Administration of doramectin incorporated in feed at 1mg/kg b.wt. of fish for 10 days effectively controlled experimentally induced Lernaea infection in Labeo fimbriatus fingerlings within an average of 19 days of post-treatment as compared to the normal course of 41 days. Similarly, doramectin given through feed at 1mg/kgb.wt. of fish for 10 days was equally effective in controlling natural infection of this parasite in the underyearlings of Catla catla and L. fimbriatus. Intramuscular administration of doramectin at 200mug/kgb.wt. of fish effectively removed adult Lernaea infection in L. fimbriatus as early as 18 days of treatment as compared to the time period of 43 days taken by the untreated fish to get rid of the infection. Single intramuscular administration of the drug was more effective against the parasite than its administration in multiple divided doses. In all cases, doramectin did not cause any noticeable adverse reactions or toxicity to the fish host. In view of the handling associated stress and other operational difficulties involved, a single intramuscular administration of the drug at 200mug/kgb.wt. is suggested for treatment of heavily infected adults and brood stock of carps. Doramectin incorporated in feed at 1mg/kgb.wt. of fish is best suited for treatment of Lernaea infection in young fish including fingerlings. However, detailed studies on the toxicity and pharmacokinetics of doramectin upon its administration to aquatic organisms and the environmental impact of its usage are required to be undertaken before finally recommending the safe use of this drug for control of parasitic infections of aquatic organisms. 相似文献
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