Survival of reared Atlantic salmon and sea trout in relation to marine conditions of smolt year in the Baltic Sea

Kallio‐Nyberg, Irma; Jutila, Eero; Jokikokko, Erkki; Saloniemi, Irma

doi:10.1016/j.fishres.2006.03.026

Cited by 42 publications

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“…Release to both sea areas (GF + BS) was included in these models. Model M2 is similar to model M1, except it includes release date that may be relevant for smolt survival (e.g., Kallio-Nyberg et al, 2006). We applied the SAS MIXED procedure with the arcsine-transformed proportions of returned tags in each release group as the response variable.…”

Section: Statistical Analysesmentioning

confidence: 99%

“…However, the latest stock assessments suggest that the main reason for the decreasing catch trend and low yield of stockings is the increased post-smolt mortality of salmon in the Baltic Sea basin (WGBAST, 2007). The recapture rate of both tagged hatchery-reared and wild salmon smolts has decreased since 1990 Kallio-Nyberg et al, 2006). The marine survival of salmon in the North Atlantic has also decreased (Jonsson and Jonsson, 2004;Todd et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…The marine survival of salmon in the North Atlantic has also decreased (Jonsson and Jonsson, 2004;Todd et al, 2008). The annual variation in the marine survival of salmon has been linked to the sea surface temperature (SST) and prey fish abundance in the sea in the release year (Friedland et al, 1998(Friedland et al, , 2000Salminen et al, 1995;Kallio-Nyberg et al, 2006). The present declining trend in the marine survival of Atlantic salmon may thus be indicative of largescale changes in the marine ecosystem, potentially associated with climatic changes (Jonsson and Jonsson, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Marine survival of reared Atlantic salmon in the Baltic Sea: The effect of smolt traits and annual factors

Kallio‐Nyberg¹,

Salminen²,

Saloniemi

et al. 2009

Fisheries Research

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Section: Statistical Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Marine survival of reared Atlantic salmon in the Baltic Sea: The effect of smolt traits and annual factors

Kallio‐Nyberg¹,

Salminen²,

Saloniemi

et al. 2009

Fisheries Research

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“…Since the 1980s, fishing pressure has been heavy, and it has threatened the naturally reproducing stocks [12,15,35,36]. In addition, since the 1990s, high post-smolt mortality for unknown reasons has impaired the state of the natural stocks [26,[37][38][39]. Changes in adaptive traits such as a decrease in the spawning age and size may constitute further risks to the viability of the remaining wild stocks.…”

Section: Introductionmentioning

confidence: 99%

Spawning-Age Differences and their Temporal Trends in Wild and Sea-Ranched Atlantic Salmon Stocks, from Stock Mixture Data

Kallio‐Nyberg¹,

Koljonen²,

Saloniemi³

2014

TOFISHSJ

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Origin and age was determined for individual fish caught in offshore catches of Atlantic salmon stocks (Salmo salar L.) in the Baltic Sea over the years [2000][2001][2002][2003][2004][2005][2006][2007][2008][2009]. DNA microsatellite loci and smolt age were used to probabilistically assign returning spawners to their stock of origin. Data for this study were based on approximately 2600 catch samples of the five most common wild and four sea-ranched, hatchery-reared stocks. Spawning age, and sex ratio differed both within and between these wild, and sea-ranched groups. The females were mainly (78.7%) two sea-winters old and the males usually (68.7%) only one sea-winter old. In both sexes, the mean age at maturity was lower in the hatchery-reared, sea-ranched stocks than in naturally reproducing stocks. In the 2000s, there was a weak decreasing trend in the male spawning age, but not in that of females. The sex-ratio of the spawners was female dominant in the naturally reproducing stocks, but male dominant in hatchery-reared stocks. Published historical data from two of the same rivers suggest that the majority of males were multi-sea-winter spawners in the 1930s, and variation in the age distribution of the spawners has become narrower and skewed towards a younger age in the present data (2000-2009) compared to the earlier situation.

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“…Después de varios años en el medio marino, esta variedad de trucha café regresa al río donde nació para reproducirse al igual como ocurre con los salmones (Kallio-Nyberg et al, 2006;De Leeuw et al, 2007). Dentro de la etapa de migración al mar ocurre un proceso fisiológico llamado esmoltificación donde un juvenil tipo parr se transforma en un juvenil tipo smolt, que le permite adaptarse a un ambiente de mayor salinidad.…”

Section: Esmoltificaciónunclassified

Cultivo de la trucha cafe anadroma: una nueva alternativa para la diversificacion de la salmonicultura nacional

Colihueque¹

2015

lajar

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RESUMEN.Con el propósito de aportar información para contribuir al desarrollo del cultivo de la trucha café anádroma (Salmo trutta trutta) en Chile, también llamada seatrout, en este trabajo se revisan los siguientes aspectos: i) características genéticas y origen evolutivo de la trucha café naturalizada existente en el país, ii) rendimiento reproductivo bajo condiciones de cautiverio, and iii) eficiencia del proceso de esmoltificación, tasa de crecimiento y maduración sexual en agua dulce y agua de mar de la trucha café anádroma. Estos últimos parámetros son particularmente relevantes para una apropiada evaluación de su desempeño bajo condiciones de cultivo intensivo. El análisis de estos aspectos indica que las poblaciones naturalizadas de trucha café en Chile presentan un alto grado de variación genética, junto con un probable origen único (línea filogenética Atlántica, norte de Europa); éstas también presentan un rendimiento reproductivo óptimo, que excede aquel observado en otros salmónidos. Además, el proceso de esmoltificación de la trucha café anádroma es equivalente al observado en salmónidos totalmente anádromos, como el salmón del Atlántico y el salmón coho. Asimismo, con excepción de la maduración precoz, que es más alta que en el salmón del Atlántico, sobre todo en los machos, esta variedad también muestra una favorable tasa de crecimiento y sobrevivencia en agua de mar. Todos estos antecedentes indican que el cultivo de la trucha café anádroma es una alternativa interesante, con potencial para ser incorporada en la salmonicultura nacional. Palabras clave: Salmo trutta trutta, trucha café, variabilidad genética, cultivo, rendimiento, acuicultura. Anadromous brown trout farming: a new alternative for the diversification of the national salmon farmingABSTRACT. In order to provide information which will contribute to the development of anadromous brown trout (Salmo trutta trutta) farming in Chile, also called seatrout, this study reviews the following aspects: i) the genetic characteristics and the evolutionary origins of the naturalized populations of brown trout distributed in our country, ii) their reproductive performance under conditions of captivity, and iii) the efficiency of smoltification process, growth rate and sexual maturation in freshwater and seawater for the anadromous brown trout. These latter parameters are particularly relevant for an appropriate evaluation of their performance under intensive culture conditions. The analysis of these issues indicates that naturalized populations of brown trout in Chile have a high degree of genetic variation, along with a probable single origin (Atlantic phylogenetic lineage, northern Europe); they also exhibit optimal reproductive performance, exceeding that observed in other farmed salmonids. Moreover, the smoltification process of the anadromous brown trout is equivalent to that of fully anadromous salmonids, such as Atlantic salmon and coho salmon. With the exception of early maturation, which is higher than in the Atlantic salmon, especially in...

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Survival of reared Atlantic salmon and sea trout in relation to marine conditions of smolt year in the Baltic Sea

Cited by 42 publications

References 33 publications

Marine survival of reared Atlantic salmon in the Baltic Sea: The effect of smolt traits and annual factors

Marine survival of reared Atlantic salmon in the Baltic Sea: The effect of smolt traits and annual factors

Spawning-Age Differences and their Temporal Trends in Wild and Sea-Ranched Atlantic Salmon Stocks, from Stock Mixture Data

Cultivo de la trucha cafe anadroma: una nueva alternativa para la diversificacion de la salmonicultura nacional

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