On the Food Relations of Fresh-Water Fishes; a summary and discussion

The principal object of the research reported in the series of papers of which this is the concluding number, is to determine more precisely than has hitherto been done the relations to nature of the various genera and families of the fishes of an interior region. This purpose has led especially to a study of the food relations of the groups, for through these, chiefly, fishes exert their influence on the outer world, and are themselves impressed in turn; and thus have appeared a number of subordinate considerations having a bearing, more or less direct, on the main intention of the study.