Author
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Mitchell, Andrew |
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Submitted to: Annual Eastern Fish Health Workshop
Publication Type: Abstract Only Publication Acceptance Date: 3/10/2005 Publication Date: 6/13/2005 Citation: Mitchell, A.J. 2005. The control of fish parasites and the eradication of Asian tapeworm infections in grass carp using praziquantel bath treatments [abstract]. Annual Eastern Fish Health Workshop. p. 30. Interpretive Summary: Technical Abstract: There are few studies on the control of fish parasites and even fewer effective or accepted methods for the direct or indirect control of these parasites. When parasite eradication from fish stocks is the goal, the probability for success is very low. Condition of host, life cycle of parasite, water quality, temperature, and chemical formulation, dose, and contact time are some of the factors that affect the outcome of control methods. In this session, presentations will be made on the use of chemicals to control alternate hosts, pre-parasitic phases, and parasites on the hosts. Presentations will also be given on management techniques to limit the number of pre-parasitic phases in a water system, to prevent parasite infection through disinfection, and to potentially enhance the production of natural host-produced substances that kill invading parasites. A number of states require that imported fish be free of the Asian tapeworm Bothriocephalus acheilognathi. Eradication of this tapeworm from the intestines of infected fish can be achieved by Praziquantel bath treatments. To obtain successful treatment, consideration must be given not only to dose, but also to treatment duration, fish holding concentration, and the intensity of the tapeworm infection. At a low fish density (6 g fish/L of water) a 1.5 mg/L Praziquantel bath treatment for 24 h is completely effective in eliminating tapeworm infections from heavily infected grass carp Ctenopharyngodon idella (30-150 tapeworms/fish). |
