Four trials were performed to evaluate the effects of water temperature on critical aspects of L. salmonae development in rainbow trout (Oncorhynchus mykiss). The permissive water temperature range in which xenomas developed was between 9 degrees C and 20 degrees C. Parasite development was arrested...

Chinook salmon Oncorhynchus tshawytscha were experimentally infected per os with Loma salmonae and held in flow-through seawater tanks at 12 to 14 degrees C. The fish exhibited 100% infection when first examined at 7 wk post initial exposure (p.e.), and by 20 wk p.e. they had completely recovered fr...

The effects of formalin and chloramine-T on oxygen consumption of juvenile brook trout (Salvelinus fontinalis) at low water temperature (2 degrees C) were studied with a flow-through respirometer. No changes were found in the oxygen consumption of these fish after exposure to formalin at 200 and 400...

Loma salmonae OA- and SV-strains were isolated from Oncorhynchus kisutch after passage of infective gill material through rainbow trout Oncorhynchus mykiss and brook trout Salvelinus fontinalis, respectively. In infection Trial I, six groups of thirty-five 10-g fish were isolated into 70-litre fibre...

Loma salmonae is a common gill parasite of salmonids, and essentially all species in the genus Oncorhynchus are susceptible. Infections occur in both fresh and salt water. Loma salmonae is directly transmissible by ingestion of spores or infected tissue. The parasite infects the wall of blood vessel...

A series of challenge and re-challenge studies was conducted in which juvenile rainbow trout were exposed to L. salmonae to determine if a primary exposure, conducted at a water temperature outside of the range which permits the parasite to undergo sporogony and form branchial xenomas, would stimula...

The oxygen consumption of 3 species of pleuronectids, the yellowtail flounder, Pleuronectes ferruginea, the winter flounder, P. americanus, and the American plaice, Hippoglossoides platessoides, were studied under simulated, land-based aquaculture conditions. Routine oxygen consumption (ROC) rates f...

Two groups of Arctic char (Salvelinus alpinus) and one of rainbow trout (Oncorhynchus mykiss) from a commercial fish farm in eastern Canada were found to have mixed infection of the gills with Flavobacterium branchiophilum (the causative agent of bacterial gill disease (BGD) and amoebae similar to t...

The therapeutic effect of dietary treatment with monensin was examined in 70 rainbow trout experimentally infected with 200 000 spores of L. salmonae. 35 fish were then a commercial diet containing ionophore monensin (10 g of monensin per kg of diet) and the remaining fish were fed the same diet wit...

Specific diseases identified from harvested wild baitfish (Notropis spp.) in Ontario included skin necrosis and/or 'tail-rot' caused by either saprophytic fungi (Saprolegnia spp.) or filamentous bacteria such as Cytophaga columnaris or C. psychrophila, furunculosis caused by Aeromonas salmonicida su...

A skin disease of intensively reared rainbow trout in Ontario, Canada, known to the farmers as 'no-mucus skin disease' , is reported for the first time. It is characterized by erosive and ulcerative lesions found mainly on the flanks of fingerlings which results in exposure of the tips of the scales...

This paper describes the gross findings, histopathology, and ultrastructural and scanning electron microscopical (SEM) appearance of farmed Norwegian Atlantic salmon dying from a disease known locally as 'acute heart failure'. Pathological findings were mainly cardiac, and some fish showed haemoperi...

Piscine nodaviruses are frequently being reported from a variety of cultured and wild finfish. These pathogens are responsible for viral encephalopathy and retinopathy (VER), also known as viral nervous necrosis (VNN) or fish encephalitis. Recently, nodavirus infections have posed serious problems f...

The oxygen consumption rates of three species of pleuronectids, the yellowtail flounder, Pleuronectes ferrugineus (Storer), the winter flounder, Pleuronectes americanus (Walbaum), and the American plaice, Hippoglossoides platessoides (Fabricius), were examined under simulated, land-based, aquacultur...

Piscine nodaviruses (Betanodaviridae) are frequently reported from a variety of cultured and wild finfishes. These non-enveloped, single-stranded RNA virions cause viral encephalopathy and retinopathy (VER), also known as viral nervous necrosis (VNN) or fish encephalitis. Recently, nodavirus infecti...

Using gill tissue from chinook salmon (Oncorhynchus tshawytscha) that contained mature xenomas laden with Loma salmonae spores, the infection was successfully transmitted to rainbow trout (O. mykiss). The infection developed in an identical manner and over a similar time course in trout as in chinoo...

The induction of protection against xenoma development by vaccinated (previously exposed to a low-virulence strain of Loma salmonae; n=40) and naive (n=40) rainbow trout (Oncorhynchus mykiss) challenged with the virulent typical strain of L. salmonae, was determined. Prevalence of infection was lowe...