Valmiki Ramayana Bala Kanda Sarga 43 Shloka 21

तदा then, शिंशुमारोरगगणै: by multitudes of sea animals and serpents, चञ्चलै: which had fickle movements, मीनैरपि च with the fish also, आकाशम् the sky, विद्युद्भिः with flashes of lightening, विक्षिप्तमिव as if scattered, अभवत् became.

The sky strewn with lightnings appeared as if it was inhabited by seaanimals, serpents and fishes fickle.