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| Bell, S.; Bron, J.E.; Sommerville, C.. |
| The morphology, function and distribution of exocrine glands of copepods have rarely been studied in detail and almost nothing is known about them in the sea lice species L. salmonis and C. elongatus. This study utilised a novel application of a light-microscopy staining technique to reveal a variety of glands m nauplius, copepodid, chalimus, preadult and adult stages. The stain, 3’,3-diaminobenzidine tetrahydrochloride (DAB), applied to fresh material, differentiated a population of exocrine glands and enabled a study of their distribution. The stain was successful in highlighting the ducts and pores associated with the larger glands. The locations of gland sub-populations were conserved in all life-stages, although glands in the swimming legs were found... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Gland; Sea lice; Diaminobenzidine; Peroxidase; Caligidae; Copepoda. |
| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/534416 |
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| Roth, Myron. |
| An international survey revealed that eleven compounds representing five pesticide types are currently being used on commercial salmon farms for sea lice control. These include two organophosphates (dichlorvos and azamethiphos); three pyrethrin/pyrethroid compounds (pyrethrum, cypermethrin, deltamethrin); one oxidizing agent (hydrogen peroxide); three avermectins (ivermectin, emamectin and doramectin) and two benzoylphenyl ureas (teflubenzuron and diflubenzuron). The number of compounds available in any one country is highly variable, ranging from 9 (Norway) to 6 (Chile, United Kingdom) to 4 (Ireland, Faeroes, Canada) to 2 (US)). Dichlorvos, Azamethiphos and cypermethrin were the most widely used compounds (5 countries) followed by, hydrogen peroxide,... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Sea lice; Pesticide survey; Chemotherapeutants. |
| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/534377 |
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| Treasurer, James W.; Grant, Andrew; Davis, Paul J.. |
| Licensed medicines available in the U.K. for treating Atlantic salmon infested with sea lice, dichlorvos, azamethiphos, and hydrogen peroxide, can only be administered by bath application. Adverse reactions have been reported to bath treatments including mortalities, inappetance, reduction in growth and reduced louse sensitivity to dichlorvos. The physical constraints of bath treatments are examined and improvements recommended. Oxygen saturation was adequate during treatments but declined rapidly when the tarpaulin was removed. A chemical marker dispersed uniformally both horizontally and vertically in a cage within 5 mins of dispensing indicating dispersal of a medicine is rapid and adequate during treatment. The range in enclosed volumes in 86... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Sea lice; Atlantic salmon; Salar; Bath application; Dichlorvos; Hydrogen peroxide. |
| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/534338 |
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| Jackson, David; Deady, Sandra; Hassett, Daniel; Leahy, Yvonne. |
| Infestation patterns of Caligus elongatus on farmed Atlantic salmon and rainbow trout were investigated at several sites along the west coast of Ireland. Parasite abundances were examined in relation to host species, farm location and season. Differences were found in the relative prevalence of infestation between salmon and rainbow trout. Caligus elongatus generally contributed more as a proportion of the total lice burden on rainbow trout than on Atlantic salmon. Evidence of possible parasite transmission from wild fish stocks was found at a number of sites where marked seasonal changes in parasite abundance were observed. A wide size distribution of adult female Caligus elongatus was found at a number of sites. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Sea lice; Farmed salmonids; Ireland. |
| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/534394 |
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| Jackson, David; Hassett, Daniel; Deady, Sandra; Leahy, Yvonne. |
| The investigation of specific characteristics of Lepeophtheirus salmonis populations on farmed salmon was made possible by the examination of the parasite infestation parameters of regular non destructive samples taken for up to six years in five bays. Perennial persistence of seasonal patterns of infestation as exhibited by intensity, prevalence and abundance was examined. Site specific characteristics were detected which appeared to be independent of inter-annual variations. Seasonal variations in individual lice size and fecundity, and temporal variation in population dynamics on the farmed fish in the five bays are considered in the context of the not inconsiderable changes in husbandry and lice control practices which have been introduced in the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Sea lice; Farmed salmon. |
| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/534374 |
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| Shinn, A.P.; Bron, J.E.; Gray, D.J.; Sommerville, C.. |
| Conventional nebulisation ICPMS (Inductively Coupled Plasma Mass Spectrometry), was used to determine the concentration of a broad range of elements in the salmon louse Lepeophtheirus salmonis. Lice samples were collected from Atlantic salmon in seven localities (4 fish farms and 3 wild salmon fisheries) on two separate sampling occasions and prepared for analysis. Sixty six elements were measured, 35 of these were found to be variable and were subjected to univariate and multivariate statistical analysis. The results of the single element comparisons showed that not all individual sites could be discriminated from each other. Sea lice collected from cultured salmonids could be discriminated from those on wild salmonids at the same site using the elements... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Elemental analysis; Sea lice; Crustacea; Copepoda. |
| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/534401 |
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