Liv Østevik

• Cand. med. vet. Dipl ECVP PhD
• Professor (Associate) at Norwegian University of Life Sciences

Denne rapporten sammenstiller resultatet av en systematisk gjennomgang av vitenskapelig litteratur, innhenting av erfaringsbasert kunnskap og analyse av tilgjengelige felt- og forskningsdata om gjellelokkforkortelse og andre gjellelokkforandringer hos laksefisk. I tillegg omtales gjellelokkforandringer og årsaker og konsekvenser av disse hos andre...

Gill disease is a major threat to aquaculture of Atlantic salmon, with an unknown and likely underestimated contribution from cnidarians such as jellyfish and biofouling hydroids. To better understand the risk and thus enable mitigation, technology for the certain identification of cnidarian-related gill damage is needed. We used the hydroid Ectopl...

This paper describes histopathological changes and present data from cases of mycobacteriosis in Norwegian farmed Atlantic salmon in our diagnostic material at Pharmaq Analytiq and Fish Vet Group Norway.

Last year (2021) 54 million Atlantic salmon died at Norwegian food producing sea sites. This constitutes a loss of 15,5% of the fish that were transferred to sea. Gill diseases are among the health issues that causes considerable mortality, economic loss, and reduced fish welfare in salmonid mariculture. The overall aim of the Ph.D. work was to inv...

Gill disease is an important cause of economic losses, fish mortality and reduced animal welfare in salmonid farming. We performed a prospective cohort study, following groups of Atlantic salmon in Western Norway with repeated sampling and data collection from the hatchery phase and throughout the 1st year at sea. The objective was to determine if...

English: Reduced gill health has become an important challenge for Norwegian salmon producers and can lead to reduced fish welfare and economic losses in both the fresh water and sea water phases of production. Infectious and non-infectious factors can impact the development and outcomes of gill disease. Gill disease can be a simple or multifactori...

Widespread resistance to medicinal delousing compounds has resulted in non-medicinal delousing methods being the preferred treatment option for sea lice infestation in Norwegian aquaculture. Thermal delousing involves submerging fish in water with a temperature of 28–34 °C for 20–30 s, while mechanical delousing entails removing the lice with flush...

Introduction: Salmon gill poxvirus (SGPV) was first detected in Norwegian farmed Atlantic salmon in 1995 and was characterized in 2015. The virus can cause outbreaks of clinical gill disease and high mortality in freshwater, but SPGV-infections have also been detected in the seawater phase of salmon farming. The aim of this study was to examine the...

Regular in situ cleaning of net pens is performed to prevent overgrowth and negative effects of biofouling during the sea phase of salmon production in Norway. Possible negative health effects of in situ net cleaning include a reduction in appetite, increased stress, and gill damage. Gill lesions have been reported after exposure to Ectopleura lary...

Agreement between a point of care device and a laboratory blood analysis machine for parameters lactate, sodium, potassium and chloride was evaluated using samples from two different Atlantic salmon populations. The results were summarised using scatter plots and calculations of Lin´s concordance correlation coefficient, and Pearson´s correlation c...

Toxoplasma gondii infection was diagnosed in 2 captive Patagonian maras (Dolichotis patagonum). One animal developed fatal systemic toxoplasmosis and had concurrent localized bacterial and fungal infections; its daughter remained clinically healthy. Microscopic findings included acute, coagulative necrosis, lymphohistiocytic inflammatory infiltrate...

Gross gill scoring is widely used for monitoring of amoebic gill disease, however a gill score system encompassing all gill lesions likely associated with reduced gill health may provide useful information when making decisions with regards to treatment and other management operations. We report preliminary results on agreement between newly develo...

Mykobakteriose, som forårsakes av ulike mykobakterier, opptrer hos en rekke fiskearter i ferskvann, brakkvann og sjøvann. Fra juli til desember 2018 har Veterinærinstituttet og Fish Vet Group Norge påvist mykobakteriose hos laks fra ett RAS-settefiskanlegg og tre matfiskanlegg (A, B og C). Smolten på matfiskanleggene var levert fra RAS-settefiskanl...

Background: An aural cholesteatoma, more appropriately named tympanokeratoma, is an epidermoid cyst of the middle ear described in several species, including dogs, humans and Mongolian gerbils. The cyst lining consists of stratified, keratinizing squamous epithelium with central accumulation of a keratin debris. This case report describes vestibul...

Scuticociliatosis in farmed lumpfish

Failure of the cartilage canal blood supply leads to ischemic chondronecrosis which causes osteochondrosis, and osteochondral lesions. Osteochondrosis is a disease with a heritable component and usually occurs under aseptic conditions. Because bacteria can bind to growth cartilage and disrupt the blood supply in pigs and chickens, we considered whe...

Fra januar 2016 til april 2018 har Fish Vet Group Norge mottatt relativt mange prøver der histologisk undersøkelse viser kronisk betennelse assosiert med såkalt Splendore-Hoeppli-materiale i indre organer hos laks uten klar årsak til dette fenomenet. Splendore-Hoeppli-fenomenet er dannelsen av antistoff-antigen komplekser som ofte omslutter infeksi...

Case-report of a abdominal malignant melanoma in an farmed Atlantic salmon.

Key Clinical Message A uveal leiomyosarcoma of a horse is reported. There are few published reports of intraocular tumors in horses. Intraocular tumors challenge animal welfare by causing uveitis, glaucoma, and loss of vision. Knowledge regarding treatment of intraocular tumors with globe preservation is sparse, and further investigations on this t...

An aural cholesteatoma, more appropriately named tympanokeratoma, is an epidermoid cyst of the middle ear reported in several species, including dogs, humans and Mongolian gerbils . The cyst lining consists of stratified, keratinizing squamous epithelium with accumulation of keratin debris centrally. This report shows histopathological evidence of...

A multiparous Celebes crested macaque presented with dystocia due to foetal macrosomia, causing foetal mortality and hindlimb paresis. After emergency caesarean section, recovery of motor function took 1 month before hindlimbs were weight bearing and 2 months before re-integration with the troop.

We would like to report rupture of a urinary bladder during manual expression in a male piglet. This event took place at the Norwegian University of Life Sciences in April 2015, during an experimental study investigating haemodynamic parameters in intravenously (IV) anaesthetized experimental piglets. The National Animal Research Authority, ID7236,...

Complete Freund’s adjuvant (CFA) is a mixture of a mineral oil and heat-killed and dried mycobacteria, with or without a surfactant. Intradermal, subcutaneous and intramuscular injections of CFA have been found to induce disseminated granulomatous inflammation in several species (Munson et al., 2005; Tabel and Ingram, 1971), but to our knowledge th...

Diagnostic exercise, a case of canine articular histiocytic sarcoma

Osteochondrosis arises as a result of focal failure of the blood supply to growth cartilage. The current aim was to examine the pathogenesis of pseudocysts and true cysts in subchondral bone following failure of the blood supply to the articular-epiphyseal cartilage complex in horses. Cases were recruited based on identification of lesions (n = 17)...

Equine recurrent uveitis (ERU) is a leading cause of blindness in horses worldwide and is the only spontaneously occurring animal model of human immune mediated uveitis (Deeg et al., 2008). Deposition of amyloid like material along the nonpigmented ciliary epithelium (NPCE) is reported to be a specific finding in ERU and is diagnostic for this cond...

Localized nasal, conjunctival and corneal amyloidosis was diagnosed in a 15-year-old pony with nasal and conjunctival masses and severe dyspnoea. Multiple swellings had been evident in the nostrils for at least two years and had gradually increased in size before presentation due to dyspnoea and exercise intolerance. Surgical debulking of the masse...

Two horses with chronic uveitis and histological lesions consistent with equine recurrent uveitis (ERU) were examined. Microscopical findings in the ciliary body included deposits of amyloid lining the non-pigmented epithelium, intracytoplasmic, rod-shaped, eosinophilic inclusions and intraepithelial infiltration of T lymphocytes. Ultrastructural e...

Surgical techniques for castration of the Vietnamese pot-bellied boar and outcome are described. Vietnamese pot-bellied pig (VPBP) boars (n = 8) were admitted for castration. Data retrieved from medical records (2002-2011) for these pigs included signalment, history, reason for castration, perioperative management, surgical technique, and complicat...