Records of post-smolt Atlantic salmon, Salmo salar L., in the Faroe-Shetland Channel in June 1996

Spatial and temporal distribution of post-smolts of Atlantic salmon (Salmo salar L.) in the Norwegian Sea and adjacent areas

“…We assume this reflects the observed tendency of post-smolts to stay in the uppermost water layers, as reported from tracking acoustically tagged post-smolts in fjords (Holm et al, 1982;Moore et al, 1998) and in net catches in nearshore waters (Dutil and Coutu, 1982;Sturlaugsson and Thorisson, 1995). Shelton et al (1997) observed that no post-smolts were caught during the dark in the areas south of 62 N where they carried out trawling, and proposed that the post-smolts stayed below the sampling depth of the trawl during dark periods. Our data from the same areas as well as those from further north show that the majority of catches are made during daylight hours (Holm et al, 1998).…”

“…The fish move relatively quickly through estuaries and fjords towards oceanic areas (Holm et al, 1982;LaBar et al, 1978;Jonsson et al, 1993). Until recently, most available information on Atlantic salmon post-smolts relates to the first days or weeks after they have left freshwater (Holm et al, 1982;LaBar et al, 1978;Dutil and Coutu, 1988;Levings et al, 1994;Sturlaugsson and Thorison, 1995;Hvidsten et al, 1995;Moore et al, 1998), while information from the open ocean is sparse (Reddin and Short, 1988;Holst et al, 1993;Shelton et al, 1997). The oceanic environment has been observed to affect the performance of salmon, and a general decline in marine survival and growth of salmon in recent years has been observed to be correlated with a reduction in sea surface temperatures in the North Atlantic (Friedland et al, 1993(Friedland et al, , 1998.…”

Impact of early infestation with the salmon louse Lepeophtheirus salmonis on the subsequent survival of outwardly migrating Atlantic salmon smolts from a number of rivers on Ireland's south and west coasts

“…Studies at Burrishoole have shown that salmon ranched smolts have moved into coastal waters within 48 hours (Moore et al, 2008). Studies by Shelton et al, 1997 andDadswell et al, 2010 have shown that smolts from the study area have travelled a distance of over 700 kilometres in seven weeks and are in an area north of Scotland and west of Norway. By comparing their survival and return rates with control fish, which have not been treated with the therapeutant and do not enjoy this protection it is possible to differentiate any additional mortality associated with lice infestation in the first six to eight weeks post migration.…”

Recapture of cultured salmon following a large-scale escape experiment

“…A surface trawl can cover a large area in a short period of time, and may therefore be useful for the recapture of salmon that have dispersed widely and are swimming close to the surface. Trawls have been used to catch young salmonids along the continental shelf of western North America (Trudel et al 2009), for research trawling in the Bering Sea (Radchenko & Mathisen 2004, Fukuwaka et al 2008 and for the capture of postsmolts in the Norwegian Sea (Shelton et al 1997, Holm et al 2000; adult salmon have been taken as bycatch in trawling on the Newfoundland continental shelf (Lear 1976). Although trawling has several applications in salmon research, this method has not yet been tested for the purpose of catching escaped adult salmon.…”