Abstract
The authors investigated the growth of hydromycobiota on the eggs of rainbow trout (Oncorhynchus mykiss) in waters of different trophicity. Of the O. mykiss eggs that were investigated, 16.6% were found to be infected by mycotal species. Thirty mycotal species were found on eggs obtained from adult female representatives. Achlya polyandra, A. radiosa, Aphanomyces laevis, Leptomitus lacteus, Saprolegnia ferax and Saprolegnia parasitica belonged to the species that were most commonly encountered. Aphanomyces frigidophilus, Candida albicans and Zoopage phanera were rarely found in salmonid fishes. Amino acid, carbohydrate and urease tests were used, and all analyses of species from the Achlya, Aphanomyces, Leptolegnia, Pythium and Saprolegnia genera showed that they assimilate glucose and starch. However, they did not assimilate glycine, leucine, lysine, ornithine, and arabinose. Urease was assimilated only by species from the Leptolegnia, Pythium and Saprolegnia genera. Key words: Oncorhynchus mykiss, rainbow trout, eggs, mycotal species, infection, hydrochemistry.
Highlights
Observa ations of my ycotal specie s es grow wth on the ra ainbow w gs (Onc corhyn nchus mykis ss) trout egg
The highest number of species was growing in water samples from Pond Fosa, while the lowest number occurred in water from River Supraśl and Pond Komosa
The present study has proven that the growth of aquatic mycotic species on the eggs of rainbow trout depends on the chemical characteristic of the water bodies from which the water samples are obtained for the experiment
Summary
Observa ations of my ycotal specie s es grow wth on the ra ainbow w gs (Onc corhyn nchus mykis ss) trout egg. The authors investigate ed the grow wth of hydrom mycobiota o on the eggs of rainbow trout (Oncorrhynchus mykiss) in waters w of diffferent trophicity. Carbohydrate and urease tests s were used,, and all anallyses of spec cies from the Achlya,, Aphanomy yces, Leptole egnia, Pythiu um and Saprrolegnia gen nera showed d that they a assimilate glucose and starch. Ho owever, they did not assimilate glyciine, leucine, lysine, ornitthine, and arrabinose. Urease was s assimilated d only by spe ecies from th he Leptolegn nia, Pythium and Saprole egnia genera
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