Diseases of wild sea trout in Scotland in relation to fish population decline

McVicar, A. H.; Sharp, Linda; Walker, Andrew; Pike, Andrew R.

doi:10.1016/0165-7836(93)90017-2

Cited by 17 publications

(11 citation statements)

References 5 publications

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“…Similar to results from laboratory studies, fin erosion and haemorrhage at the base of the dorsal fin have been frequently recorded in wild-captured sea trout with heavy burdens of chalimus (McVicar et al 1993, Dawson 1998, MacKenzie et al 1998, Skaala et al 2014a). The patterns reported from laboratory studies, with attachment of chalimi primarily to the dorsal fin and mobile stages present along the dorsal or more anterior body regions, are confirmed from numerous field studies (Tully et al 1993a,b, Dawson 1998, MacKenzie et al 1998, Marshall 2003, Urquhart et al 2008.…”

Section: Effects Of Salmon Lice On Individual Sea Trout In Field Studiessupporting

confidence: 67%

“…The patterns reported from laboratory studies, with attachment of chalimi primarily to the dorsal fin and mobile stages present along the dorsal or more anterior body regions, are confirmed from numerous field studies (Tully et al 1993a,b, Dawson 1998, MacKenzie et al 1998, Marshall 2003, Urquhart et al 2008. Cranial lesions and grazing marks on the gill opercula, and along the ventral body surfaces have also been described (McVicar et al 1993, Tully et al 1993b). …”

Section: Effects Of Salmon Lice On Individual Sea Trout In Field Studiessupporting

confidence: 56%

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Effects of salmon lice Lepeophtheirus salmonis on wild sea trout Salmo trutta—a literature review

Thorstad¹,

Todd²,

Uglem³

et al. 2015

Aquacult. Environ. Interact.

129

142

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Salmon farming increases the abundance of salmon lice, which are ectoparasites of salmonids in the sea. Here we review the current knowledge on the effects of salmon lice on wild sea trout. Salmon lice feed on host mucus, skin and muscle, and infestation may induce osmoregulatory dysfunction, physiological stress, anaemia, reduced feeding and growth, increased susceptibility to secondary infections, reduced disease resistance and ultimately mortality of individual sea trout. Wild sea trout in farm-free areas generally show low lice levels. In farm-intensive areas, lice levels on wild sea trout are typically higher, and more variable than in farm-free areas. Lice on wild sea trout are found at elevated levels particularly within 30 km of the nearest farms but can also extend to further ranges. Salmon lice in intensively farmed areas have negatively impacted wild sea trout populations by reducing growth and increasing marine mortality. Quantification of these impacts remains a challenge, although population-level effects have been quantified in Atlantic salmon by comparing the survival of chemically protected fish with control groups, which are relevant also for sea trout. Mortality attributable to salmon lice can lead to an average of 12−29% fewer salmon spawners. Reduced growth and increased mortality will reduce the benefits of marine migration for sea trout, and may also result in selection against anadromy in areas with high lice levels. Salmon lice-induced effects on sea trout populations may also extend to altered genetic composition and reduced diversity, and possibly to the local loss of sea trout, and establishment of exclusively freshwater resident populations.

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Section: Effects Of Salmon Lice On Individual Sea Trout In Field Studiessupporting

confidence: 67%

Section: Effects Of Salmon Lice On Individual Sea Trout In Field Studiessupporting

confidence: 56%

Effects of salmon lice Lepeophtheirus salmonis on wild sea trout Salmo trutta—a literature review

Thorstad¹,

Todd²,

Uglem³

et al. 2015

Aquacult. Environ. Interact.

129

142

View full text Add to dashboard Cite

show abstract

“…8 Hastein and Lindstad, 1991;McAllister and Bebak, 1997;McVicar et al, 1993;Mortensen, 1993;Sonstegard et al, 1972;Wallace et al, 2008). Clinical signs of the disease and/or epizootics have not been reported in wild salmonids, however mortalities associated with IPNV in wild marine fish have been observed in non-salmonids (Atlantic menhaden, Brevoortia yrannus (Latrobe) (Stephens et al, 1980) and southern flounder, Aralichthys lethostigmata (McAllister et al, 1984).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Disease interaction and pathogens exchange between wild and farmed fish populations with special reference to Norway

Johansen¹,

Jensen²,

Mikkelsen³

et al. 2011

Aquaculture

167

121

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“…Studies were undertaken to examine the cause of the suspected collapse in stocks, focusing on disease (McVicar et al, 1993) and parasites (Sharp et al, 1994;Mackenzie et al, 1998) possibly related to the rapid expansion of the Atlantic salmon Salmo salar (L.) aquaculture industry in the region (McVicar, 1997). However, beyond rod catches no detailed long-term information Sea trout and salmon fisheries within the catchment and Loch Ewe are controlled by the Ewe District Salmon Fishery Board (DSFB), a statutory body representing owners of local fishing rights.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the Sea Trout Salmo trutta (L.) Stock Collapse in the River Ewe (Wester Ross, Scotland), in 1988‐2001

Butler

Walker

2007

Sea Trout: Biology, Conservation and Management

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Diseases of wild sea trout in Scotland in relation to fish population decline

Cited by 17 publications

References 5 publications

Effects of salmon lice Lepeophtheirus salmonis on wild sea trout Salmo trutta—a literature review

Effects of salmon lice Lepeophtheirus salmonis on wild sea trout Salmo trutta—a literature review

Disease interaction and pathogens exchange between wild and farmed fish populations with special reference to Norway

Characteristics of the Sea Trout Salmo trutta (L.) Stock Collapse in the River Ewe (Wester Ross, Scotland), in 1988‐2001

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