Two ways to help to are tagging caught fish then remove non tagged fish by electroshock or seine/trap.
Here you go Bill. Do you want the study?
Philipp et al. (2009) demonstrated that vulnerability to recreational angling is a heritable trait (heritability h2 = 0.15) by conducting multi-generation artificial selection on Largemouth Bass based on the number of times individuals were captured by experimental angling. Further studies on the lines developed by Philipp et al. (2009) revealed that selection from recreational angling acts on a suite of behavioral (Cooke et al. 2007; Nannini et al. 2011; Sutter et al. 2012), physiological (Cooke et al. 2007; Redpath et al. 2010), and reproductive (Cooke et al. 2007; Sutter et al. 2012) traits. Individuals that were bred for high angling vulnerability had higher metabolic rates (Redpath et al. 2010) and higher reproductive success (Sutter et al. 2012).
http://forums.pondboss.com/ubbthreads.ph...true#Post475742 http://forums.pondboss.com/ubbthreads.ph...true#Post159224
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