We investigate drivers of performance and behavior for six strains of brook trout. Although less studied than commonly stocked and aquacultured rainbow trout, brook trout have a higher per mass protein content and popular among anglers. Therefore, brook trout represent an untapped resource and understanding variability in hatchery performance among strains could optimize culture. We compare growth, feeding styles and catchability for Assinica, Horn Lake, Little Tupper, Temiscamie, Temiscamie x Domestic hybrid and Windfall.
Differences were observed among strains in specific growth rate (Figure 1A), length-to-weight relationships, and dry weight. Although there was not a relationship between surface feeding frequency and specific growth rate, surface feeding frequency was strongly related to order of capture in a lined earthen pond (Figure 1B).
Our study shows among strain variation in traits relevant to hatchery and aquaculture production, with Assinica, Temiscamie x Domestic hybrids and Little Tupper well suited due to strong growth. Interstrain variability in performance underscores the importance of exploring a range of strains to better understand potential under aquaculture conditions. An improved understanding of strain-specific traits will improve our capacity to select ideal strains for different contexts. For example, selecting strains with more aggressive surface feeding to support catchable populations or culturing strains that maintain high growth and fat content.