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Bg 10.31

pavanaḥ pavatām asmi
rāmaḥ śastra-bhṛtām aham
jhaṣāṇāṁ makaraś cāsmi
srotasām asmi jāhnavī
Synonyms: 
pavanaḥ — the wind; pavatām — of all that purifies; asmi — I am; rāmaḥ — Rāma; śastra-bhṛtām — of the carriers of weapons; aham — I am; jhaṣāṇām — of all fish; makaraḥ — the shark; ca — also; asmi — I am; srotasām — of flowing rivers; asmi — I am; jāhnavī — the river Ganges.
Translation: 
Of purifiers I am the wind, of the wielders of weapons I am Rāma, of fishes I am the shark, and of flowing rivers I am the Ganges.
Purport: 

Of all the aquatics the shark is one of the biggest and is certainly the most dangerous to man. Thus the shark represents Kṛṣṇa.