O twice-born, from the ocean of goodness are the Lord His incarnations as innumerable as the thousands of streams found from the lakes.
O brâhmanas, the incarnations of the Lord are innumerable, like rivulets flowing from inexhaustible sources of water.
Text 27:
All the powerful sages, the godly, the Manus and their progeny, as well as the Prajâpatis [founding fathers] are aspects of the Lord.
All the rishis, Manus, demigods and descendants of Manu, who are especially powerful, are plenary portions or portions of the plenary portions of the Lord. This also includes the Prajâpatis.
Text 28:
All these are part of Lord Krishna, the Supreme Lord [Bhagavân] in person who gives protection in all ages and worlds against the enemies of the king of heaven [Indra].
All of the above mentioned incarnations are either plenary portions or portions of the plenary portions of the Lord, but Lord Sri Krishna is the original personality of Godhead. All of them appear on planets whenever there is a disturbance created by the atheists The Lord incarnates to protect the theists.