George Haydock's Catholic Commentary
Psalms 103:25
Arms. Man acts thus to denote something very extensive. (Haydock) --- The sea is frequently put for the same purpose, Job xi. 9., and Lamentations ii. 13. Arms is omitted in the Septuagint and the ancient psalters. --- Creeping. Fishes, (Genesis i. 20.; Calmet) and all animals without feet (Worthington) in the waters. (Haydock) --- Nothing multiplies so fast as fishes. (Aristotle, Anim. ix. 17.) (Worthington)