A reusable rock holder for use as a fishing sinker is disclosed. According to embodiments of the disclosure, instead of using a conventional fishing sinker in a fishing rig, the reusable rock holder can secure a rock or other object for use as a sinker. The reusable rock holder can secure rocks or objects having different or irregular shapes and/or sizes corresponding to materials naturally occurring in the environment. Furthermore, the reusable rock holder can release the rock or other object when snagged, allowing the fisherman to retrieve the rock holder and the rest of the fishing rig. The fisherman can then simply find another rock, secure it in the rock holder, and resume fishing. The availability of rocks at the fishing location can provide a zero-cost source of eco-friendly sinkers.