Comparative performance of juvenile sea trout families in high and low feeding environments

Groups of right full-sibling wild sea trout Salmo trutta L. families, commu nally reared. exhibited highly significant differences in family representa tion in the largest 75 percentile within each tank at the end of the observ ation period (referred to as family performance). Despite these large diffe rences in family performance within tanks, there were no significant differ ences in performances of families relative to each other between high and l ow feeding levels. These results are discussed in the context of domesticat ion selection. (C) 2001 The Fisheries Society of the British Isles.