Knot a Fish is the debut and most critically acclaimed EP by the Irish post-punk band Five Go Down to the Sea?, released in 1983 on the London-Irish label Kabuki records and distributed by Rough Trade. Recorded just after the band changed their name from Nun Attax, it is the only of their recordings to feature cellist Úna Ní Chanainn, and is widely considered their best work. The EP was recorded at Sulán Studios, Ballyvourney, in the autumn of 1982, shortly before the band relocated from Cork City to London. Only Ní Chanainn stayed behind.