The group is fishing-themed. The groups's name ("つりビット") is a portmanteau, composed of two parts: "angling" (釣り,tsuri) and "bit" (as it is explained, "bit" is an English word for "a small piece" or "the smallest unit").
Members
Each member has "a fish she wants to catch". For example, Ayu Konishi wants to catch an ayu because it's a homonym of her name.