428 research outputs found
Nonstrangulating small colon obstruction caused by a submucosal haematoma
No full textS. Stahel, C. B. Riley, M. Wichtel and P.-Y. Daous
The Canadian harp seal hunt: observations on the effectiveness of procedures to avoid poor animal welfare outcomes
No full textThe Canadian harp seal (Pagophilus groenlandicus) hunt has, for several decades, raised public concerns related to animal welfare. The field conditions under which this hunt is carried out do not lend themselves easily to detailed observations and analyses of its killing practices. This article reports observations carried out over several seasons that aimed at obtaining more specific information about the conditions under which seals are killed, in order to assess potential welfare issues and explore avenues for possible improvements in its practice. A standardised three-step process for killing seals (ie stunning, checking by palpation of the skull, and bleeding) was recently implemented to maximise the proportion of animals that are killed rapidly with minimum pain. Based on field observations, the rifle and the hakapik, when used properly, appeared to be efficient tools for stunning and/or killing young harp seals. All carcases of seals observed to be killed with a rifle, either on the ice or in the water, could be recovered. However, shooting seals in water rather than on ice carried a higher risk of poor welfare outcome because of the limited opportunities to shoot the animals again if not stunned with the first shot. Based on current practices, there is no reliable evidence that the Canadian harp seal hunt differs from other forms of exploitation of wildlife resources from the perspective of animal welfare. Although opportunistic field observations may be less amenable to generalisation than structured studies, we believe that they reflect the reality of the hunt and provide valuable information to direct the evolution of its practice.P.-Y. Daoust and C. Carague
Nodular gill disease: a unique form of proliferative gill disease in rainbow trout, Salmo gairdneri Richardson
No full textIn an outbreak of proliferative gill disease in laboratory rainbow trout fingerlings lesions were multifocal among filaments and uniquely severe in the distal region of affected filaments, forming nodules. This contrasted with the more common forms of proliferative gill disease in Ontario, such as bacterial gill disease, in which lesions are diffuse along and among filaments. The cause is unknown, although cells with a very distinctive morphology were closely associated with the lesions..RE: 22 ref.; SC: ZA; CA; VE; 0V; 0ISource type: Electronic(1) http://upei-resolver.asin-risa.ca?sid=SP:CABI&id=pmid:&id=&issn=0140-7775&isbn=&volume=8&issue=6&spage=511&pages=511-522&date=1985&title=Journal%20of%20Fish%20Diseases&atitle=Nodular%20gill%20disease%3a%20a%20unique%20form%20of%20proliferative%20gill%20disease%20in%20rainbow%20trout%2c%20Salmo%20gairdneri%20Richardson.&aulast=Daoust&pid=%3Cauthor%3EDaoust%2c%20P%20Y%3bFerguson%2c%20H%20W%3C%2Fauthor%3E%3CAN%3E19862272504%3C%2FAN%3E%3CDT%3EJournal%20article%3C%2FDT%3
The pathology of chronic ammonia toxicity in rainbow trout, Salmo gairdneri Richardson
No full textTwo groups of rainbow trout fingerlings were exposed for 90 days to 0.2 and 0.4 mg/l of un-ionized ammonia, respectively. Several fish exposed to the higher concentration soon developed clinical signs suggestive of a neurological dysfunction but subsequently recovered. No lesion attributable to ammonia was seen in the gills of any of the fish. This raises questions about the precise role of ammonia in the production of gill diseases in intensively cultured trout..RE: 25 ref.; RN: 7664-41-7; SC: ZA; CA; VE; EC; 0V; 0ISource type: Electronic(1) http://upei-resolver.asin-risa.ca?sid=SP:CABI&id=pmid:&id=&issn=0140-7775&isbn=&volume=7&issue=3&spage=199&pages=199-205&date=1984&title=Journal%20of%20Fish%20Diseases&atitle=The%20pathology%20of%20chronic%20ammonia%20toxicity%20in%20rainbow%20trout%2c%20Salmo%20gairdneri%20Richardson.&aulast=Daoust&pid=%3Cauthor%3EDaoust%2c%20P%20Y%3bFerguson%2c%20H%20W%3C%2Fauthor%3E%3CAN%3E19842244566%3C%2FAN%3E%3CDT%3EJournal%20article%3C%2FDT%3
Potential for recovery in nodular gill disease of rainbow trout, Salmo gairdneri Richardson
No full textNodular gill disease characterized by severe multifocal epithelial hyperplasia was diagnosed in a group of rainbow trout fingerlings. Gills of a large proportion of fish transferred from the affected tank to smaller aquaria showed a marked decrease in severity of the lesions after 2 months. Repair of hyperplastic lesions may occur in various forms of proliferative gill disease, provided that the basement membrane lining the filaments and lamellae remains intact..RE: 11 ref.; SC: ZA; CA; VE; 0V; 0ISource type: Electronic(1) http://upei-resolver.asin-risa.ca?sid=SP:CABI&id=pmid:&id=&issn=0140-7775&isbn=&volume=9&issue=4&spage=313&pages=313-318&date=1986&title=Journal%20of%20Fish%20Diseases&atitle=Potential%20for%20recovery%20in%20nodular%20gill%20disease%20of%20rainbow%20trout%2c%20Salmo%20gairdneri%20Richardson.&aulast=Daoust&pid=%3Cauthor%3EDaoust%2c%20P%20Y%3bFerguson%2c%20H%20W%3C%2Fauthor%3E%3CAN%3E19862285526%3C%2FAN%3E%3CDT%3EJournal%20article%3C%2FDT%3
Comparison of the thickness of the calvarium between young grey (Halichoerus grypus) and harp (Pagophilus groenlandicus) seals = Comparaison de l'épaisseur de la calotte crânienne entre les jeunes phoques gris (Halichoerus grypus) et les jeunes phoques du Groenland (Pagophilus groenlandicus)
No full textCharles Caraguel, Pierre-Yves Daoust and Fiep de Bie.; 1 online resource (ii, 6 pages); 1919-5044; Distributed by the Government of Canada Depository Services Program (Weekly checklist 2013-35).; Includes bibliographical references.; Mode of access: Internet.; Issued by: Fisheries and Oceans, Quebec Region.; Co-author Pierre-Yves Daoust is a member of faculty at University of Prince Edward Island.; Research document (Canadian Science Advisory Secretariat : Online) ; 2012/172
A review of animal welfare implications of the Canadian commercial seal hunt
No full textAbstract not availablePierre-Yves Daoust, Mike Hammill, Garry Stenson, Charles Carague
Journal of the Helminthological Society of Washington 60 2 205 210
No full textSpecimens of Bolbosoma capitatum and Bolbosoma sp. were recovered from 2 male Physeter macrocephalus that died following a mass stranding on Prince Edward Island, Canada. Some aspects of previous descriptions of B. capitatum have been incomplete, particularly with characteristics of the hooks of the proboscis being poorly defined. Females of B. capitatum were found to have 16-18 longitudinal rows of hooks with either 7-8 or 8-9 hooks in each row. The largest hooks with strongly curved blades were apical to median (overall range 69-112 micro m long), whereas the basal hooks were spinelike (68-91 micro m long). The basal hooks had a unique transverse orientation of the roots, an attribute apparently shared only with B. physeteris, among the 14 species of Bolbosoma from cetaceans and pinnipeds. Although Bolbosoma capitatum had apparently been reported from P. macrocephalus in the eastern Atlantic Ocean, none of these records could be substantiated. The current report constitutes a new geographic record (Gulf of St. Lawrence, Canada) and the first account of this parasite in sperm whales from North American waters.
Polar Biology 25 8 562 568 SPRINGER-VERLAG NEW YORK; 175 FIFTH AVE, NEW YORK, NY 10010 USA
No full textBeach surveys for harp (Phoca groenlandica) and hooded (Cystophora cristata) seals documented a dramatic increase in their numbers on Sable Island in the mid-1990s. From late 1994 to 1998, 1,191 harp and 870 hooded seals, mostly young animals, were recorded on the island whereas, in the 1980s, no more than 5 animals of both species were observed each year. Of the 2,061 harp and hooded seals examined, 41.7% were found alive, 26.7% were killed by sharks, and 31.6% were found dead but intact. This increase in numbers of harp and hooded seals on Sable Island, which is south of their historic northern range, is consistent with the recent increase of extralimital occurrences of these species along the east coast of North America. However, the large number of seals recorded in this study provides more information on their demography than has previously been possible
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