All these avataras or incarnations are either amshas (portions) or kalas (fractions) of the Lord. But Shri Krishna is the Lord Himself, the incarnator, not the incarnation. When people are frustrated by the injustices of demons, then the Lord assumes many forms, age after age, for their protection || 28 ||
English translation and commentary of Srimad Bhagavatam. Adapted from the Hindi commentary of Srimad Bhagavatam by Maharajshri Shri Akhandanand Saraswati Maharaj