Annual Variation in Age Composition, Growth and Abundance of Sea Trout Returning to the River Dee at Chester, 1991‐2003

Davidson, Ian; Cove, Richard J.; Hazlewood,

doi:10.1002/9780470996027.ch6

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…However, our results suggest that SW0 and SW1 could sustain stable growth rate over the 39-year study period. In fact, Davidson et al, (2006) even reported increased post-smolt growth for these two age-class in the sea trout population of the River Dee. This differing response among sea-age classes could indicate local changes in the conditions that sea trout encountered at sea, rather than a broad decrease in growth opportunities.…”

Section: Discussionmentioning

confidence: 97%

Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France

Josset,

Beaulaton,

Romakkaniemi

et al. 2023

Preprint

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The resilience of sea trout populations is increasingly concerning, with evidence of major demographic changes in some populations. Based on trapping data and related scale collec-tion, we analysed long-term changes in body length of a sea trout population in the Bresle River, France. From 1984-2022, the length of first-time returning individuals decreased by 1.18 mm.year-1 (SD = 0.03), which resulted in the loss ofc.8% of mean body length. This decrease results from a decrease in the age at first return, with a gradual loss of the oldest individuals and an increase in the proportion of the youngest. Timing of the return migration advanced drastically, although shorter sea sojourn had little influence on body length. We found little evidence of a decrease in length-at-age, to the exception of the oldest age class, suggesting that growth conditions at sea might not have deteriorated greatly during the study period.

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Section: Discussionmentioning

confidence: 97%

Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France

Josset,

Beaulaton,

Romakkaniemi

et al. 2023

Preprint

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“…Previous studies have described the nature of sea trout populations and their life history characteristics (Nall 1930, Went 1962, Elliott 1985, Le Cren 1985, Jonsson, 1985, Solomon 1995, Davidson et al 2006, Poole et al 2006), but few long-term studies have described changes in population dynamics and examined possible underlying causes. A salmon and sea trout research programme began on the Erriff catchment in County Mayo on Ireland's west coast in 1983 to evaluate the health status of these populations, determine suitable management strategies to address identified impacts and apply findings to other salmonid catchments.…”

Section: Introductionmentioning

confidence: 99%

Temporal variation in sea trout Salmo trutta life history traits in the Erriff River, western Ireland

Gargan¹,

Kelly²,

Shephard³

et al. 2016

Aquacult. Environ. Interact.

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The demographic and life history characteristics of sea trout Salmo trutta L. populations can be changed by a range of pressures in both freshwater and marine environments. Few long-term monitoring programmes are in place to assess temporal change in population dynamics. We analysed a 20 yr time series (1985−2004) using 15 sea trout population response variables in the Erriff River, western Ireland. Over this period, when time was considered as a categorical variable comprising 4 sequential periods of 5 yr, important life history changes were observed. The most dramatic of these changes corresponded with the period immediately after the commencement of salmon farming in the local estuary, with significant decreases in the number and length of sea trout kelts, the estimated number of eggs deposited, the sea trout rod catch, the proportion of older (1+ and 2+ sea age) fish and the frequency of repeat spawners. We found a significant positive relationship between the number of salmon lice Lepeophtheirus salmonis in the local salmon farm and the number of lice found on sea trout collected contemporaneously in local rivers. Results of this long-term monitoring programme demonstrate that significant changes in sea trout population structure with respect to quantitative life history traits can occur over a relatively short time period and suggest that the introduction of salmon farming into the local estuary most likely contributed to the observed changes in sea trout population dynamics.

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“…While cutthroat and brown trout are direct descendants of unique ancestors, O. rastrosus and S. salar, respectively, (McKay et al 1996;Bernatchez et al 2004;Trotter et al 2018), their origin is the product of similar circumstances (glaciation, dispersal limitations, geographic barriers, and other climate-driven factors) in the Pleistocene era. Specifically, brown trout diverged from Atlantic salmon into several isolated geographic lineages (Bernatchez 2001;Crete-Lafreniere et al 2012) that remained separate from each other for roughly 2 million years, and all retained the capacity for anadromy (Sloat et al 2014). The anadromous form is thus not phylogenetically distinct from freshwater forms (Ferguson et al 2019).…”

Section: Origin and Phylogenymentioning

confidence: 99%

Anadromous trout from opposite sides of the globe: biology, ocean ecology, and management of anadromous brown and cutthroat trout

Losee,

Palm,

Claiborne

et al. 2023

Rev Fish Biol Fisheries

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Anadromous brown trout (Salmo trutta) in the northeastern Atlantic Ocean, and coastal cutthroat trout (Oncorhynchus clarkii clarkii) in the northeastern Pacific Ocean, are analogs in many ways. Both species display similar patterns of complex life histories and behavioral flexibility, are iteroparous and facultatively anadromous and occupy nearshore coastal marine habitats where numerous populations often mix. These characteristics create specific challenges for management and conservation that have been complicated by inadequate scientific attention in some areas. Both species are declining across their native range, and their ecology make them particularly vulnerable to habitat destruction, fishing, and climate change. Here, we review the available literature to compare the biology, ocean ecology, and management practices of these two species. We highlight ecological similarities and differences between the species and identify current knowledge gaps suggesting future research needs and management actions. Using a comparative approach, the review aims to promote and facilitate knowledge exchange between anadromous trout research communities from opposite sides of the globe to improve management and conservation of these species and stimulate the production of management plans specific to anadromous trout.

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Annual Variation in Age Composition, Growth and Abundance of Sea Trout Returning to the River Dee at Chester, 1991‐2003

Cited by 6 publications

References 2 publications

Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France

Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France

Temporal variation in sea trout Salmo trutta life history traits in the Erriff River, western Ireland

Anadromous trout from opposite sides of the globe: biology, ocean ecology, and management of anadromous brown and cutthroat trout

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