The study investigated the growth of hydromycoflora on the eggs of common carp (Cyprinus carpio L.) in five water bodies of different eutrophication levels. Thirty-three (33) species of mycotal organisms, including 28 species belonging to Peronosporomycota, 2 to anamorphic fungi and 1 each to Ascomycota, Blastocladiomycota and Zygomycota were identified on the eggs. The water from River Biala and Pond Fosa, which are more biogenic, had the largest number of mycotal species (20 and 19, respectively) on the eggs of common carp. The smallest number of those species was found on the eggs of common carp in water from Spring Cypisek, Pond Komosa and River Suprasl, which are low in biogenes (12, 11 and 11, respectively). Achlya diffusa, Aphanomyces laevis, Saprolegnia ferax, Saprolegnia parasitica and Pythium ultimum belong to the species that were most frequently found on C. carpio eggs. The following rare mycotal species were also found: Allomyces arbuscula, Aphanomyces frigidophilus, Candida albicans, Fusarium aquaeductum, F. culmorum and Zoopage phanera. Amino acid, carbohydrate and urease tests were used. Of the C. carpio eggs that were investigated, 12.7% were found to be infected with mycotal species.

No abstract

The straminipiles (Oomycota), lineage of fungus-like eukaryotic microorganism, growing on the eggs of an African catfish, Clarias gariepinus, in water of different trophicity in Poland have been investigated. Twenty-one (21) species were recorded. The largest number of species occurred on eggs in water from River Biala and Pond Fosa (more biogenic), the smallest in water from River Suprasl and Pond Dojlidy (poor in biogenes). The most commonly encountered species on the C. gariepinus eggs were: Saprolegnia parasitica, Achlya polyandra, A. oblongata, A. prolifera, Aphanomyces frigidophilus, S. ferax and Leptomitus lacteus. Amino-acid, carbohydrate and urease tests were used. 11.4% of C. gariepinus eggs investigated were found to be infected by Straminipiles species.

The authors investigated the growth of straminipilous organisms on the eggs of inconnu (Stenodus leucichthys) and nelma (Stenodus nelma) in water from three different eutrophication levels. Thirty (30) straminipilous species were found growing on the investigated eggs (of both fish species) used as baits. The majority of species has been found on the eggs of inconnu (20) in comparison with those found on the eggs of nelma (15). The highest number of infected eggs of both investigated species has been observed also in the water from Biała river (27.3% of the inconnu and 21.6% of the nelma; the most eutrophication), the smallest in water from Supraśl River (6.3 and 8.8% respectively; the less eutrophication). These differences for both species were statistically significant. Amino acid, carbohydrate and urease tests were used.

The authors investigated the growth of straminipiles fungi on the alevins of Nile tilapia (Oreochromis niloticus niloticus L.) in water from eight limnologically and trophically different water bodies. Twentyseven species were recorded. The largest number of species occurred on alevins in water from the Biala River and Fosa Pond (more biogenic), and the fewest in water from Dojlidy Pond and Lake Blizno (poor in biogenesis). The most commonly encountered species on Nile tilapia alevins were Saprolegnia parasitica, Saprolegnia ferax, Achlya polyandra, Achlya oligocantha, Achlya prolifera, Leptomitus lacteus, and Pythium diclinum. Amino acid, carbohydrate, and urease tests were used.