Cannibalism in non‐native brown trout Salmo trutta and rainbow trout Oncorhynchus mykiss stream‐dwelling populations Journal of Fish Biology

Introduced and allopatric populations of brown trout Salmo trutta and rainbow trout Oncorhynchus mykiss were sampled in Slovenia for stable isotope analysis to assess dietary niche shifts through ontogeny and estimate the propensity for cannibalism. Both S. trutta and O. mykiss are cannibals, with higher average relative contribution of conspecific assimilated energy for S. trutta (27·9%) compared with O. mykiss (7·7%). The smallest cannibal was 166 mm in the S. trutta population and 247 mm in the O. mykiss population.

本研究在斯洛文尼亚采集了引入的异域分布褐鳟（Salmo trutta）与虹鳟（Oncorhynchus mykiss）种群样本，通过稳定同位素分析，旨在评估其食性生态位随个体发育的动态变化，并估算同类相食的发生倾向。两种鳟鱼均存在同类相食行为，其中褐鳟种群的同种同化能量平均相对贡献占比为27.9%，显著高于虹鳟种群的7.7%。褐鳟种群中发生同类相食的最小个体体长为166毫米，虹鳟种群则为247毫米。