Fishing Hook

In Links Awakening, you can trade the Broom to the lady outside Grandpa Uluria's house in exchange for the Fishing Hook (She says she found it on accident while sweeping). If you dive under the bridge to meet the Fisherman, You can give him the fishing hook and he'll fish up the Mermaid's Necklace for you. If you talk to him a second time in the DX version, he'll fish up the Cameraman, and he'll take a picture for your photo album.