A STUDY OF THE PATHOGENICITY OF TWO AQUATIC FUNGI ON CARP EGGS

A STUDY OF THE PATHOGENICITY OF TWO AQUATIC
FUNGI ON CARP EGGS
AL-REKABI, S.A.W.
*
, AL-JUBORI, S.S. AND SHNESHIL, S.S.
Department of Biology Al Mustansiriyah University, Baghdad College of Science.
Key words: Carp fish, Aquatic fungi, pathogenic fungi.
ABSTRACT
Oomycetes Fungi are real Aquatic Fungi, they are widely spread in Aquatic systems,
specially fresh and brackish water, few are present in saline water they are of a great
importance to the Aquatic system due to thier Saprophytic nutrition which decompose nonliving plants and animal bodies in water, In addition to that many were found to be parasitic
to Fish and their eggs.In this study two Oomycetes were isolated from the Tigris river in the
area of Baghdad, the aim of the work was to investigate if these two fungi are pathogenic
to Cyprinus Carpio (Carp Fish) eggs or not. Using different degrees of temperature and
using different baiting techniques, it was found that non-living fish eggs gave earlier
growth 24hrs. compared to Sesamum indicum (sesame) seeds which took 72hrs. to attract
the zoospores and establish growth.Test of the pathogenisity was carried out using living
eggs. It was found that the eggs were penetrated by and fully colonized with each fungi
seperatly after 20 hrs. at 20
oC.Enzymatic tests confirmed the ability of booth of S. turfosa
and Achlya spp. to produce lipase, lecithinase and proteinase in addition to parasitic nature
of these fungi to fish & their eggs, this would be confirmed in a future study.