Seven species of the genus Trichodina Ehrenberg, 1838 were identified during a sampling programme of twenty freshwater fish species from approximately sixty sites in Scotland, England and Wales. Species found include: Trichodina acuta Lom, 1961 from Cyprinus carpio L., Carassius auratus L., Oncorhynchus mykiss (Walbaum), Salmo trutta L. and Phoxinus phoxinus L.; Trichodina domerguei Wallengren,...

the objective of the study was to investigate pollution sources in the Vilnia river and evaluate the toxicity of sewage, contamination of the Vilnia river water and bottom sediments, using a complex of biological methods. toxicity was assessed by use of various indices of test-organisms: seed germination and root growth in Lepidium sativum l., and mortality and physiological indices in early on...

Incorporation of marine-derived nutrients (MDN) into freshwater food webs of southeastern Alaska was studied by measuring the natural abundance of nitrogen and carbon stable isotopes in biota from artificial and natural streams. Biofilm, aquatic macroinvertebrates (detritivores, shredders, and predators), and fish (coho salmon, Oncorhynchus kisutch, and cutthroat trout, Oncorhynchus clarki) wer...

Technological solutions used in the course of artificial reproduction chum salmon (Oncorhynchus keta) conditions private farming Magadan region are considered.
 The potential effectiveness fish-breeding measures carried out Takhtoyam fish hatchery to preserve stocks and increase volume its catch rivers Shelikhov Bay is shown.

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A coho salmon Oncorhynchus kjsutch (Walbaum) was found to develop lesions associated with so called X-cells propagating in the liver parenchyma. The ultrastructural features, insufficient to determine the origin of X-cells, corresponded to those found in pseudobranchial tumours of Atlantic cod by Watermann & Dethlefsen (Helgolander Meeresunters. 35: 231-242, 1982).