Density‐dependent growth in brown trout: effects of introducing wild and hatchery fish

By T. Bohlin, L. Sundström, J. Johnsson, J. Höjesjö, J. Pettersson. 2002

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Competitive interactions between native and exotic salmonids: a combined field and laboratory demonstration (2007, background): “Bohlin et al. (2002) and Cross & Benke (2002) found that secondary production (i.e., growth rate) is an efficient way to identify and quantify interaction strength compared with apparent survival.”
Investment in territorial defence depends on rearing environment in brown trout (Salmo trutta) (2003, background): “These findings help explain why released hatchery-reared brown trout show a compromised growth and survival in the wild (Deverill et al 1999; Bohlin et al. 2002).”
The relative roles of domestication, rearing environment, prior residence and body size in deciding territorial contests between hatchery and wild juvenile salmon (2003, background): “trout stocked into streams in comparison with wild conspecifics (Bohlin et al. 2002).”
Factors that contribute to the ecological risks of salmon and steelhead hatchery programs and some mitigating strategies (2009, background): “High fish densities in fresh water have been associated with decreased growth, increased or premature emigration, increased competition for food, decreased feeding territory sizes and increased mortalities (Gee et al. 1978; Hume and Parkinson 1987; Nielsen 1994; Keeley 2000, 2001; Bohlin et al. 2002”