pavanah pavatam asmi
ramah shastra-bhrtam aham
jhasanam makaras casmi
srotasam asmi jahnavi

"Of purifiers I am the wind, of the wielders of weapons I am Rama, of fishes I am the shark, and of flowing rivers I am the Ganges."

Pavatam = among the circulating, asmi = I [Sri Krishna] am, pavana = wind. Shastra-bhrtam = among the weapon holding [persons], rama = Sri Rama. Jhasanam = among aquatic animals, makaram = Makara [vehicle of Varuna]. Srotasam = among running water, jahnavi = [river] Ganges. Wind is never stagnant at one place and it always is in circulation. Lord Vayu, god of Wind is strongest. Vayavyam, an yagna performed to please lord Vayu, would get wealth. Hanuman is considered as the son of lord Vayu. Circulation of air is essential for our living. When the Lord is telling He is Sri Rama, among those wielding weapons, we may get a doubt whether Sri Krishna is an avatar of Sri Rama and not of Sriman Narayana. But we have to note that the Lord speaks of the quality of handling weapons. So, the Lord is the weapon handling quality of Sri Rama. This is the same as when He mentiones He is Vishnu among Adityas. Or, like He is Sama Veda among Vedas. In all these contexts He is mentioning the quality. Both Sri Rama and Sri Krishna are avatars of Sriman Narayana and that is how Alwars have praised also. River Ganges has many names like Ganga, Jhanavi, Bhagirathi, Alakananda, etc.