An apparatus for releasably attaching a sonar transducer to a transom, the apparatus comprised of: a first support member; a second support member, a portion of which forms a U-shaped portion that is adapted to engage the transom; a length adjustment mechanism that allows for vertical translation of the first support member relative to the second support member; a locking mechanism that temporarily secures the first support member to the second support member; an anti-pivot member on the first support member adapted to temporarily prevent the apparatus from moving relative to said transom; and a mounting bracket also on the first support member and adapted to mount the sonar transducer thereon. The apparatus can further include one or more cable clips for securing an electric cable to the apparatus in which the cable electrically connects a remote power source to a sonar transducer.