Physiological performance of ballan wrasse (Labrus bergylta) at different temperatures and its implication for cleaner fish usage in salmon aquaculture

Publication date: Available online 15 May 2019Source: Biological ControlAuthor(s): Jeffrey William Yuen, Tim Dempster, Frode Oppedal, Malthe HvasAbstractBallan wrasse (Labrus bergylta) are used extensively as cleaner fish to control salmon lice (Lepeophtheirus salmonis) infestations in the Atlantic salmon (Salmon salar) aquaculture industry. Fish are either cultured or caught in the wild before being transferred to salmon sea cages. Ballan wrasse are a poorly studied species, and fundamental knowledge of physiological performances and environmental limits are therefore needed for better deployment strategies and to predict when animal welfare may be at risk. We acclimated ballan wrasse for a minimum of 2 weeks to 5, 10, 15, 20 and 25 °C, representing the full range of temperatures wrasse may experience in salmon sea cages. Swim tunnel respirometry was performed at each temperature to measure standard and maximum metabolic rates, aerobic scope, and critical swimming speed (Ucrit). No mortalities occurred at any acclimation temperature. However, fish were generally inactive at lower temperatures, as evidenced by low metabolic rates. It was not possible to stimulate fish to swim continuously between 5 and 20 °C, and Ucrit was only obtained at 25 °C as 27 cm s−1 (1.1 body lengths s−1). The aerobic scope increased throughout the thermal interval tested from 129 ± 7 mg O2 kg−1 h−1 at 5 °C to 265 &plusm...
Source: Biological Control - Category: Biology Source Type: research

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Abstract Gene editing offers opportunities to solve fish farming sustainability issues that presently hampers expansion of the aquaculture industry. In for example Atlantic salmon farming, there are now two major bottlenecks limiting the expansion of the industry. One is the genetic impact of escaped farmed salmon on wild populations, which is considered the most long-term negative effect on the environment. Secondly and the utmost acute problem is the fish parasite salmon lice, which is currently causing high lethality in wild salmonids due to high concentrations of the parasite in the sea owing to sea cage salmo...
Source: Transgenic Research - Category: Genetics & Stem Cells Authors: Tags: Transgenic Res Source Type: research
Pediculosis is an infestation of lice on the body, head, and/or pubic region that occurs worldwide. Lice are ectoparasites of the order Phthiraptera that feed on the blood of infested hosts. Their morphotype dictates their clinical features. Body lice may transmit bacterial pathogens that cause trench fever, relapsing fever, and epidemic typhus, which are potentially life-threatening diseases that remain relevant in contemporary times. Recent data from some settings suggest head lice may harbor pathogens.
Source: Journal of the American Academy of Dermatology - Category: Dermatology Authors: Source Type: research
In this study we have monitored microbial communities in a fish farm for lumpfish during normal operational conditions with no disease outbreak by using 16S rRNA gene amplicon sequencing. The study involved weekly samplings of water and biofilms from fish tanks, and fish. The results revealed that the microbial communities in fish tank water were different from the intake water. The water and biofilm in fish tanks were highly similar in regards to microbial community members, but with large differences in relative abundances for some taxa. The sampled fish were associated with mostly the same taxa as in tank water and biof...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
Conclusions: Health education about the harmful effect of this traditional practice for head lice infestation will prevent further similar events.
Source: Cornea - Category: Opthalmology Tags: Clinical Science Source Type: research
Psychiatric Services, Ahead of Print.
Source: Psychiatric Services - Category: Psychiatry Authors: Source Type: research
This report came just over a month afterDHS OIG ’s May 30 report on “dangerous overcrowding” in El Paso.What are the conditions in CBP ’s detention camps?Across the entire border, CBPwas detaining from May to June between 4 and 5 times as many people as its facilities were designed to hold. It is impossible to list here everything that the OIG reports exposed, but here are some of what they found:A cell with a maximum capacity of 35 held 155 detaineesA cell with a maximum capacity of 8 held 41 detaineesDetainees were wearing soiled clothing for days or weeks.Children at three of the five Border Patr...
Source: Cato-at-liberty - Category: American Health Authors: Source Type: blogs
PMID: 31300428 [PubMed - in process]
Source: Canadian Family Physician Medecin de Famille Canadien - Category: Primary Care Authors: Tags: Can Fam Physician Source Type: research
Publication date: August 2019Source: Epilepsy &Behavior, Volume 97Author(s): Loretta Giuliano, Angela La Neve, Carlo Andrea Galimberti, Umberto Aguglia, Leonilda Bilo, Caterina Ermio, Giulia Monti, Elena Zambrelli, Corrado Zenesini, Barbara MostacciAbstractIntroductionAfter the European Medicines Agency (EMA) warning on the use of valproate (VPA) in female patients, we explored the antiepileptic drug (AED) prescribing attitudes of Italian epileptologists with regard to sex and VPA use in patients with epilepsy.Material and methodsA specifically designed 30-item questionnaire was distributed at the annual multicenter me...
Source: Epilepsy and Behavior - Category: Neurology Source Type: research
via Polák et al, 2019 By Christian Jarrett You may be best advised not to read this article late at night or before you eat. Psychologists at the National Institute of Mental Health and Charles University in the Czech Republic have surveyed a large sample of non-clinical volunteers to gauge their reaction to 24 creatures that are commonly the source of specific animals phobias. The results, published in the British Journal of Psychology, not only contribute to our understanding of animal phobias, but could prove incredibly useful to horror writers. Among the key findings is that spiders were unique in being both int...
Source: BPS RESEARCH DIGEST - Category: Psychiatry & Psychology Authors: Tags: Emotion evolutionary psych Mental health Source Type: blogs
Abstract INTRODUCTION: After the European Medicines Agency (EMA) warning on the use of valproate (VPA) in female patients, we explored the antiepileptic drug (AED) prescribing attitudes of Italian epileptologists with regard to sex and VPA use in patients with epilepsy. MATERIAL AND METHODS: A specifically designed 30-item questionnaire was distributed at the annual multicenter meeting of the Italian League Against Epilepsy (LICE), held in Rome on January 2018. One hundred and sixty-nine physicians answered the questionnaire. RESULTS: In females, VPA was significantly less prescribed as first-choice AED ...
Source: Epilepsy and Behaviour - Category: Neurology Authors: Tags: Epilepsy Behav Source Type: research
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