About 350 pounds.
450 pounds
not much if it's a baby
It depends on the dolphin breed. Sorry I couldn't be very specific.
A baby dolphin weigh about 300 pounds
they weigh about 30 -90 lbs at birth
5 tons
19 tonne.
It depends on what type of dolphin.
They vary in weight greatly - from 10kg, up to 10 tonnes (which is 10000kg). But since I presume you're asking for the common dolphin - a common dolphin can weigh up to 75 kg.
There are seven species of River Dolphin. With some more information, We might be able to help with your answer.
Usually, Rough-Toothed Dolphins weigh about 250 pounds as an adult.