Variation in the temperature preference and growth rate of individual fish reconciles differences between two growth models

摘要: Summary 1. A growth model, originally developed for brown trout (Salmo trutta), has now been fitted to data Atlantic salmon (S. salar) and stone-loach (Barbatula barbatula) from English populations, Arctic charr (Salvelinus alpinus) Sweden. The model relates rate temperature a fish of standard size the functional relationship triangular shape with sharp peak at optimal zero base triangle. It was unsuitable Norwegian salmon, curvilinear Ratkowsky provided better fit, though experimental protocol different in experiments. 2. were kept groups each tank, had compete food, be divided into slow, moderate fast growers before could fitted. Each its own tank fed individually. For replicate experiments, similar selected. Variation among under conditions therefore small, essentially individual fish, not fish. 3. present simulation study tests hypothesis that differences response account growth-temperature salmon. used generate group having slightly preference rate. result response, well approximated by (adjusted R2 = 0.96). When variability increased, an even fit R2 = 0.98). Therefore, apparent discrepancy between two models reconciled allowing within fish.