77 research outputs found
The epidemiology of the sea lice, Caligus elongatus Nordmann, in marine aquaculture of Atlantic salmon, Salmo salar L., in Scotland
Exophiala angulospora infection in hatchery reared lumpfish (Cyclopterus lumpus) broodstock
Funding Information Biotechnology and Biological Sciences Research Council. Grant Numbers: BB/M026566/1, BB/P020224/1 Natural Environment Research Council. Grant Number: NE/P007570/1 University of AberdeenPeer reviewedPublisher PD
The Efficacy of Emamectin Benzoate against Infestations of Lepeophtheirus salmonis on Farmed Atlantic Salmon (Salmo salar L) in Scotland, 2002–2006
Infestations of the parasitic copepod Lepeophtheirus salmonis, commonly referred to as sea lice, represent a major challenge to commercial salmon aquaculture. Dependence on a limited number of theraputants to control such infestations has led to concerns of reduced sensitivity in some sea lice populations. This study investigates trends in the efficacy of the in-feed treatment emamectin benzoate in Scotland, the active ingredient most widely used across all salmon producing regions. Study data were drawn from over 50 commercial Atlantic salmon farms on the west coast of Scotland between 2002 and 2006. An epi-informatics approach was adopted whereby available farm records, descriptive epidemiological summaries and statistical linear modelling methods were used to identify factors that significantly affect sea lice abundance following treatment with emamectin benzoate (SLICEH, Schering Plough Animal Health). The results show that although sea lice infestations are reduced following the application of emamectin benzoate, not all treatments are effective. Specifically there is evidence of variation across geographical regions and a reduction in efficacy over time. Reduced sensitivity and potential resistance to currently available medicines are constant threats to maintaining control of sea lice populations on Atlantic salmon farms. There is a need for on-going monitoring of emamectin benzoate treatment efficacy together with reasons for any apparent reduction in performance. In addition, strategic rotation of medicines should be encouraged and empirical evidence for the benefit of such strategies more fully evaluated
Using model selection to choose a size-based condition index that is consistent with operational welfare indicators
Quantitative and qualitative measures of fish health and welfare are essential for management of both wild capture and aquaculture species. These measures include morphometric body condition indices, energetic condition, and aquaculture operational welfare indicators (OWI). Measures vary in ease of measurement (and may require destructive sampling), and it is critical to know how well they correlate with fish health and welfare so appropriate management decisions can be based on them. Lumpfish (Cyclopterus lumpus) is a new farming species that needs non-destructive OWIs to be developed and validated. In this study, we developed a C. lumpus fin damage score. Four different body condition indexes based on individual weight relative to either length-weight relationships, or relative to other fish in its local environment were tested (using model selection) as predictors of individual fin damage. Results showed severity of fin damage was predicted by small size relative to the other individuals in the tank or cage. Body condition based on length-weight relationship was not found to predict fin damage, indicating that using established indices from fisheries or from other species would not predict welfare risks from fin damage. Implications are that especially in hatchery conditions grading will improve the condition index, and is expected to mitigate fin damage, but that low weight at length was not of use in predicting fin damage. Model selection to choose between a suite of possible indices proved powerful, and should be considered in other applications where an easily measured index is needed to correlate with other health measures
The Ecological Conditions That Favor Tool Use and Innovation in Wild Bottlenose Dolphins (Tursiops sp.)
Dolphins are well known for their exquisite echolocation abilities, which enable them to detect and discriminate prey species and even locate buried prey. While these skills are widely used during foraging, some dolphins use tools to locate and extract prey. In the only known case of tool use in free-ranging cetaceans, a subset of bottlenose dolphins (Tursiops sp.) in Shark Bay, Western Australia habitually employs marine basket sponge tools to locate and ferret prey from the seafloor. While it is clear that sponges protect dolphins' rostra while searching for prey, it is still not known why dolphins probe the substrate at all instead of merely echolocating for buried prey as documented at other sites. By ‘sponge foraging’ ourselves, we show that these dolphins target prey that both lack swimbladders and burrow in a rubble-littered substrate. Delphinid echolocation and vision are critical for hunting but less effective on such prey. Consequently, if dolphins are to access this burrowing, swimbladderless prey, they must probe the seafloor and in turn benefit from using protective sponges. We suggest that these tools have allowed sponge foraging dolphins to exploit an empty niche inaccessible to their non-tool-using counterparts. Our study identifies the underlying ecological basis of dolphin tool use and strengthens our understanding of the conditions that favor tool use and innovation in the wild
A survey of the ATP-binding cassette (ABC) gene superfamily in the salmon louse (Lepeophtheirus salmonis)
Salmon lice,Lepeophtheirus salmonis(Krøyer, 1837), are fish ectoparasites causing significant economic damage in the mariculture of Atlantic salmon,Salmo salarLinnaeus, 1758. The control ofL.salmonisat fish farms relies to a large extent on treatment with anti-parasitic drugs. A problem related to chemical control is the potential for development of resistance, which inL.salmonisis documented for a number of drug classes including organophosphates, pyrethroids and avermectins. The ATP-binding cassette (ABC) gene superfamily is found in all biota and includes a range of drug efflux transporters that can confer drug resistance to cancers and pathogens. Furthermore, some ABC transporters are recognised to be involved in conferral of insecticide resistance. While a number of studies have investigated ABC transporters inL.salmonis, no systematic analysis of the ABC gene family exists for this species. This study presents a genome-wide survey of ABC genes inL.salmonisfor which, ABC superfamily members were identified through homology searching of theL.salmonisgenome. In addition, ABC proteins were identified in a reference transcriptome of the parasite generated by high-throughput RNA sequencing (RNA-seq) of a multi-stage RNA library. Searches of both genome and transcriptome allowed the identification of a total of 33 genes / transcripts coding for ABC proteins, of which 3 were represented only in the genome and 4 only in the transcriptome. Eighteen sequences were assigned to ABC subfamilies known to contain drug transporters,i.e. subfamilies B (4 sequences), C (11) and G (2). The results suggest that the ABC gene family ofL.salmonispossesses fewer members than recorded for other arthropods. The present survey of theL.salmonisABC gene superfamily will provide the basis for further research into potential roles of ABC transporters in the toxicity of salmon delousing agents and as potential mechanisms of drug resistance
Examination of extensive data sets reveal patterns of sea lice abundance in Scotland
abstract: A database of sea lice counts from 33 sea water farms in Scotland, UK from the Firth of Cyde to Loch We, Sky and the Western Isles, was compiled. Data were assimilated for a 5-year period (1996-2000), involving counts on 70 824 fish (salmon). The pattern of abundance is reported for Lepeophtheirus salmonis. Lice numbers had strong seasonal and annual patterns. When stocking took place, after fallowing, sea lice numbers were very low and increased slowly to a level of around 7 lice per fish by the end of the first year of production. In the second year, a decline in counts was noted in the early spring but thereafter lice numbers increased throughout the year with fluctuations due to treatments with sea lice medicines. Mean lice abundance was not significantly influenced by coastal exposure or geographical region
Veterinary Record 151 25 753 757 BRITISH VETERINARY ASSOC LONDON; 7 MANSFIELD ST, LONDON W1M 0AT, ENGLAND
A recently compiled national database on sea lice infestations on farmed Atlantic salmon, contains detailed records for the period 1996 to 2000 from over 30 commercial sites on the west coast of Scotland. The data indicate that the two prevalent species of lice, Lepeophtheirus salmonis and Caligus elongatus, have different trends in abundance and distinctive seasonal patterns of infestation on farmed salmon. For the economically important species L salmonis, its abundance on fish varies with the time of the production cycle, the time of year and the particular year. Weekly fluctuations in sea lice counts indicate that treatment can be very effective in controlling infestations but that the counts recover rapidly and regular treatments are necessary to ensure control. A comparison of sites using medium or large numbers of treatments suggests that they do not reduce sea lice infestations to the same levels. There is also evidence that sites using treatments based on different chemical constituents had significantly different levels of infestation.CR: BOWERS JM, 2000, J FISH DIS, V23, P165 BOXASPEN K, 1997, ICES J MAR SCI, V54, P1144 BRON JE, 1993, J FISH DIS, V16, P487 BRON JE, 1993, PATHOGENS WILD FARME, P263 BUSH AO, 1997, J PARASITOL, V83, P575 COSTELLOE M, 1999, BULL EUR ASSN FISH P, V19, P260 FINSTAD B, 1994, AQUACULTURE FISHERIE, V25, P761 GRANT AN, 1993, PATHOGENS WILD FARME, P255 HOGANS WE, 1995, CANADIAN TECHNICAL R, V2067 JACKSON D, 2000, CONTRIB ZOOL, V69, P71 JACOBSEN JA, 1997, ICES J MAR SCI, V54, P1113 JAWORSKI A, 1992, AQUACULT FISH MANAGE, V23, P577 KABATA Z, 1979, PARASITIC COPEPODA B, P179 MACKENZIE K, 1998, ICES J MAR SCI, V55, P151 NAGASAWA K, 1993, PATHOGENS WILD FARME, P166 PIKE AW, 1999, ADV PARASIT, V44, P233 RAE GH, 2002, PEST MANAG SCI, V58, P515 REVIE CW, 2002, J FISH DIS, V23, P309 REVIE CW, 2002, PEST MANAG SCI, V58, P576 TODD CD, 2000, HYDROBIOLOGIA, V429, P181 TREASURER JW, 2000, AQUACULTURE, V187, P247 TUCKER CS, 2000, J FISH DIS, V23, P309 TULLY O, 1989, J MAR BIOL ASSOC UK, V69, P279 TULLY O, 1999, PARASITOLOGY 1, V119, P41 WADSWORTH SL, 1998, THESIS U ABERDEEN UK WALLACE C, 1998, THESIS U BERGEN NORW WHITE HC, 1940, J FISH RES BOARD CAN, V5, P172 WOOTEN R, 1982, P ROY SOC EDINB B, V81, P18
Exposure of goldsinny, rock cook and corkwing wrasse to low temperature and low salinity: survival, blood physiology and seasonal variation
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