EFFECT OF TEMPERATURE ON PATHOGENICITY OF ICHTHYOPHTHIRIUS MULTIFILIIS IN RAINBOW TROUT (ONCORHYNCHUS MYKISS)

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ALISHAHI M.

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Journal: JOURNAL OF VETERINARY PATHOBIOLOGY Year:2010 | Volume:1 | Issue:2 Page(s): 3-11

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Title

EFFECT OF TEMPERATURE ON PATHOGENICITY OF ICHTHYOPHTHIRIUS MULTIFILIIS IN RAINBOW TROUT (ONCORHYNCHUS MYKISS)

Author(s)

ALISHAHI M. | Issue Writer Certificate

Keywords

RAINBOW TROUTQ2

ICHTHYOPHTHIRIUS MULTIFILIISQ3

WATER TEMPERATUREQ3

PATHOGENICITYQ3

Abstract

The ciliate ICHTHYOPHTHIRIUS MULTIFILIIS (Ich) is a well described skin parasitic pathogen of large number of freshwater fishes. The parasite causes great loses both in freshwater aquaculture enterprises worldwide as well as in natural ecosystems. In this study the severity and distribution plan of ICHTHYOPHTHIRIUS MULTIFILIIS on surface of fish in 12C° and 20C° were investigated. First Fish were challenged with parasite then mortality and abundance of visible trophonts on fish surface were counted 3, 6 and 9 days after challenge. results shows that not only the parasite is more severe in 20C° than 12C° but, pattern of throphonts distribution on fish surface is significantly different in two groups (P<0.05). Mortality after 10 days in 12°C and 20°C were 41% and 63% respectively. Prevalence of ich in fins in 12C° was 55%, 50% and 54% in 3, 6 and 9 days after challenge respectively, whereas it was 31%, 33% and 33% in 20C°. Prevalence of Ich in skin in12C° were 37% , 34% and 39% in 3, 6 and 9 days after challenge respectively, versus it was 64%, 61% and 60% in 20C°. No significant difference was observed in prevalence of ich in gills in 20C° and 12C°. According to the results, prevalence of ich on fish skin and fins depends on the temperature in which infection occurred. Although ich is more active in higher temperature, the site of infection is another reason of higher mortality in 20C° than 12C°. Failure in osmoregulation is mentioned as an important reason of fish death caused by ICHTHYOPHTHIRIUS MULTIFILIIS, hence fish is more sensitive in higher temperature in which ich located mostly in skin, than lower temperature in which ich situated in fins.

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APA: Copy

ALISHAHI, M.. (2010). EFFECT OF TEMPERATURE ON PATHOGENICITY OF ICHTHYOPHTHIRIUS MULTIFILIIS IN RAINBOW TROUT (ONCORHYNCHUS MYKISS). JOURNAL OF VETERINARY PATHOBIOLOGY, 1(2), 3-11. SID. https://sid.ir/paper/195528/en

Vancouver: Copy

ALISHAHI M.. EFFECT OF TEMPERATURE ON PATHOGENICITY OF ICHTHYOPHTHIRIUS MULTIFILIIS IN RAINBOW TROUT (ONCORHYNCHUS MYKISS). JOURNAL OF VETERINARY PATHOBIOLOGY[Internet]. 2010;1(2):3-11. Available from: https://sid.ir/paper/195528/en

IEEE: Copy

M. ALISHAHI, “EFFECT OF TEMPERATURE ON PATHOGENICITY OF ICHTHYOPHTHIRIUS MULTIFILIIS IN RAINBOW TROUT (ONCORHYNCHUS MYKISS),” JOURNAL OF VETERINARY PATHOBIOLOGY, vol. 1, no. 2, pp. 3–11, 2010, [Online]. Available: https://sid.ir/paper/195528/en

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