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First report of Ichthyophthirius multifiliis (Ciliophora: Oligohymenophorea) from Aphanius dispar (Cyprinodontidae) in Iran
Authors: Zeinab Gholami, Mohammad Taghi Rahimi, Roghayeh Zarei, Eshrat Beigom Kia, Iraj Mobedi, Sajad Vatandoost
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Objective: To determine the infection of Aphanius dispar (A. dispar) by Ichthyophthirius multifiliis
(I. multifiliis) in Iran.
Methods: A total of 97 (22 males and 75 females) individuals were collected using dip net
from Mehran River, Hormuzgan Province, South of Iran in January 2008. Total length, standard
length and weight of the collected specimens were measured to using vernier caliper. Whole
body of fish was examined macroscopically for the presence of any blister. For the detection of
Ichthyophthirius, the mucus was scraped gently from skin onto a micro slide and stained by Azocarmine. Prevalence, intensity and abundance of parasite were analyzed.
Results: In this study 50 (51.55%) specimens including 12 males and 38 females were found
infected with I. multifiliis which is an obligate protozoan parasite of freshwater fishes with a
direct life cycle and it causes weight loss and mortality in fishes. The infection is known as
ichthyophthiriasis or white spot disease, one of the most serious diseases in freshwater fishes.
Prevalence, intensity and abundance of parasite in female and male fishes were 50.67%, 29.26,
14.83 and 54.55%, 18 and 9.82, respectively. No sex preference and predilection of body site as
microhabitats for this parasite in A. dispar, as well as in three length groups of fish standard
length ranging 18-23 mm, 23-28 mm and 28-34 mm. However, prevalence and abundance are
significantly increased in larger fish than smaller one.
Conclusions: This is the first report of I. multifiliis (Fouquet, 1876) from A. dispar in Iran and this
fish is considered as a new host for the parasite.