The Sharks maintained their unbeaten start to the Super Rugby season after replacement winger Curwin Bosch scored a late intercept try to secure a second bonus-point win from as many games.
The Sharks, playing their first home game of the campaign, having humbled the Sunwolves in Singapore in the opening week, produced a good combination of attack and defence to claim a deserved 19-0 lead at halftime.
Aphelele Fassi, Robert du Preez and Akker van der Merwe each scored a try in the opening half, in which the Sharks produced slick handling and strong mauling as they dominated the New Zealand visitors, but the Blues were much better in the second stanza.
The Blues were on the front foot from the whistle in the second half, holding on the the ball and building phases but they were able to score only one try, through replacement Tanielu Tele'a, as they were undone by errors an ill-discipline, although fly-half Oteri Black had a score disallowed for a scrum infringement in the lead-up.
Such was the Blues pressure in the second half that the Sharks and their fans must have been feeling nervous, especially when Ruan Botha was yellow-carded in the 77th minute, and there was a sense of waiting for the final whistle that was quelled only when Bosch intercepted a loose pass from Black in the 79th minute, in the hosts' 22, and raced the length of the field to score untouched under the Blues posts.