so it can swim faster.
To swim.
if by larger you mean thicker,its because that is the base of the tail and there is also a joint there,so it needs to be strong
their largest muscles are the tail
The scales on their belly are large, and overlap going towards the tail. Strong muscles enable them to push against the ground, pushing them forward.
its almost as strong as chuck norris
it is so strong it poops out babies
Dolphins do have a strong tail with strong kick. That is showcased in many aquariums when they perform tail-walking above water or jumps.
They flap their tails and fins and they use their fin and tail muscles! :)
Answer
very
Yes, a fish needs a tail to swim.
She's pretty strong. Her legs are strong from her tail she has to swim in. Her arms are strong from swimming in general.