We will also request that the extension issue be decided through an oral hearing, defence lawyer Taavi Tuula tells TT.
The captain is suspected on probable cause of causing death after the accident at the end of July, when a merchant ship collided with a pleasure boat off Tjörn.
The reason the defence opposes remand is the captain's attitude - he denies the crime.
Of the four people on the pleasure boat, two died: a woman and a child.
