The authors investigated the dead fragments of 22 species of submerged plants in the water from three limnological and trophical different water bodies (spring, river and pond). A total of 184 species of aquatic fungi, including 119 zoosporic and 65 conidial species were found on the fragments investigated plants. The most common fungus species were Aphanomyces laevis, Saprolegnia litoralis, Pythium rostratum (zoosporic fungi) and Acrodictys elaeidicola, Anguillospora longissima, Angulospora aquatica, Lemonniera aquatica, Mirandina corticola, Tetracladium marchalianum, Tetracladium maxiliformis, Trinacrium subtile (conidial fungi).Most fungus species were observed on the specimens of Elodea canadensis (33 fungus species), Hippuris vulgaris f. submersa (33), Myriophyllum spicatum (34) and Potamogeton crispus (33), fewest on Ceratophyllum demersum (24), Fontinalis dalicarlica and Potamogeton nitens (each 25).The most fungi were growing in the water from River Supras´l (107), the fewest in the water from Pond Dojlidy (99). Some aquatic fungus species were observed in the water of only one of the three water bodies -in Pond Dojlidy (30), in Spring Jaroszo´wka (32) and in the River Supras´l (39) species. Seventy-five species growing only on fragments of single submerged plants. A number of zoosporic and conidial species (22 and four, respectively) appeared new to Polish waters. Out of these 119 zoosporic species, some are known as parasites or necrotrophs of fish.
We investigated the growth of straminipilous organisms on the skin, muscles and liver of herbivorous pirapitinga (Piaractus brachypomus) and carnivorous piranha (Pygocentrus nattereri) in water of three different eutrophication levels. Sixteen straminipilous organism species were found growing on the investigated body parts of both species of fish used as baits. The higher number of species was found on the baits of carnivorous species (15) when compared with the ones from the herbivorous pirapitinga (10 species). The highest number of straminipilous organisms species developed on the skin of both species of fish. The highest number of species of straminipilous organisms was observed growing in the water of the Biała river (middle eutrophication), while the lowest number occurred in the baits of vessels with water from the Dojlidy pond (low eutrophication).Keywords: straminipilous organisms, Piaractus brachypomus, pirapitinga, Pygocentrus nattereri, red piranha.
Organismos stramenophila em crescimento na herbívora pirapitinga (Piaractus brachypomus) e na carnívora piranha (Pygocentrus nattereri) da Polônia ResumoInvestigamos o crescimento de organismos stramenophila sobre a pele, músculos e fígado da herbívora pirapitinga (Piaractus brachypomus) e da carnívora piranha (Pygocentrus nattereri) em águas de três diferentes níveis de eutrofização. Dezesseis espécies de organismos stramenophila foram encontradas crescendo sobre as partes do corpo investigadas de ambas as espécies de peixes utilizadas como cobaias. O maior número de espécies foi encontrado em cobaias de espécies carnívoras (15), quando comparado com o da herbívora pirapitinga (10 espécies). A maioria das espécies de organismos stramenophila desenvolveu-se sobre a pele de ambas as espécies de peixes. O maior número de espécies de organismos stramenophila foi observado em crescimento nas águas do rio Biała (eutrofização do meio), enquanto o número mais baixo ocorreu em cobaias de vasos com água do lago de Dojlidy (eutrofização baixa).
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