Favourite Port River dolphin Captain Hook goes missing sparking a search and fears for his safety 36-year-old Port River dolphin Captain Hook has been missing for three weeks. Picture: Marianna Boorman Source: Supplied ONE of Port Adelaide's oldest and most loved dolphins Captain Hook is missing, feared dead, local marine experts say. Rangers and volunteers from the Adelaide Dolphin Sanctuary and Whale and Dolphin Conservation Society have not sighted the popular bottle-nosed dolphin for three weeks. Whale and Dolphin Conservation Society volunteer Marianna Boorman said she feared the worst. "We've had problems with people feeding him, which makes him more vulnerable, so we are worried that he may no longer be around," Ms Boorman said. Although he does have a big home range, we probably see him about once a week if not every couple of days. The groups and rangers have increased patrols and have spoken with local fishermen and boaties in a bid to locate Captain Hook. "Because people have been feeding him for so long, he has become so tame, so we generally see him begging for food around boats," Ms Boorman said. This is one of the main issues with feeding wild animals, as it means they then start hanging around boats, take fish off fishing lines and are more vulnerable to being deliberately harmed by people who get frustrated with them hanging around. Captain Hook is one of the oldest dolphins in the Port River at 36 years of age and is a well-known and well-researched dolphin. Ms Boorman said he was easily recognisable with a tall-curved fin and a mark on his dorsal fin. Anyone who sights Captain Hook or has further information should contact the WDC on 8449 6470.