A Comparative Study in Isolation of Saprolegniaceae Species from Infected Eggs, Larvae and Adults Common Carp Fish in Two Fish Hatcheries, in Middle of Iraq
This study was undertaken during the period from January 2010 till the end of July 2010, its aim was to find out if there are differences in fungal infections in two main fish hatcheries (Al-Manahel and Al-Wahda ) in middle of Iraq. From 472 samples 147 samples from adult fish; 75 from larvae and 250 from eggs. The Saprolegniaceae genera (Aphanomyces, Achlya, Dictyuchus, Saprolegniaparasitica and S. ferax). Saprolegniaparasitica was the most occurrence percentage in eggs and larvae (33.2% and 52%) respectively, Saprolegnia sp. the most frequent in larvae (46.6%) whereas Aphanomyces was the most frequent in eggs (29.9%). The high percentage of infection in the early life stages of the fish because the lack of the defense system and depends on the crowding and aggregations of eggs and larvae. Regarding natural Saprolegnia species infection in both hatcheries on adult fish, there were no significant differences in fungal infections between the two hatcheries. Nevertheless, there were highly significant differences (P<0.01) between months in percentage of fungal infection in fish body, which was 1% in both mouth and eyes and 61% in the dorsal fin.
Saprolegniaceae, Common Carp, Middle of Iraq
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