It's Water Hyacinth all right :-), but the bird doesn't look like an
Acrocephalus at all. Some juvenile Prinia, maybe?
-- ams
I suppose so.
> I am also attaching a similar picture taken in Dec.'06 in wetlands of
> Kolkata & identified as Paddyfield Warbler.
Yes, that one is a Paddyfield Warbler, but the two birds look very
different to me.
-- ams