É um verdadeiro tubarão usado ou é apenas informatizado?

Três tubarões mecânicos foram construídos , todos apelidados de "Bruce" , depois do advogado de Spielberg.

^[Fonte]

Como os tubarões com defeito de Steven Spielberg transformaram o negócio de filmes

Producers wanted Spielberg to hire someone to train a great white — an impossibility.

The director toyed with rubber props before ultimately deciding the only real answer was to build a remote-controlled mega-shark—a 25-footer that could swim, leap in the air, and munch on human prey.

Every special effects company in Hollywood called the task impossible. Undeterred, Spielberg lured effects guru Bob Mattey out of retirement. Famous for designing the giant squid in the 1954 film 20,000 Leagues Under the Sea, Mattey assured the director he could build the perfect monster.

A natureza mecânica do tubarão causou alguns problemas, que na verdade mudaram a abordagem de Spielberg para o filme.

When Bob Mattey finally delivered Bruce, Spielberg began to panic.

On its first day on the job, the shark promptly sank to the bottom of Nantucket Sound. Within a week, saltwater had eroded Bruce’s electric motor, and he had to be refitted with a system of pneumatic hoses. Every night, Bruce also had to be drained, scrubbed, and repainted.

Even by diva standards, Bruce was high-maintenance.

Spielberg também chamado o tubarão "o grande bosta branca " .

• “I had no choice but to figure out how to tell the story without the shark,” Spielberg said. “So I just went back to Alfred Hitchcock: ‘What would Hitchcock do in a situation like this?’ ... It’s what we don’t see which is truly frightening.”

The idea of the unseen enemy completely changed the film’s direction.

Caça Bruce, ou, na trilha do tubarão 'Tubarão'

Bruce the mechanical shark had a dirty little secret: It didn't work very well.

Stories abound of the animatronic shark stalling the moment it hit water and sinking to the seafloor. In fact, the finicky mechanics ended up pushing the film both over budget and over schedule.

Como se constata, há realmente um quarto Bruce.

... this fourth shark was never used in the film, but it does appear to have been cast from the original Bruce mold at the time of the film.

It was made for use at the Universal Studios Theme Park in Hollywood, where it hung by its tail from 1975 to 1990.

A maioria das cenas apresenta um tubarão mecânico.

Algumas imagens de um tubarão real também foram usadas:

Footage of real sharks was shot by Ron and Valerie Taylor in the waters off Australia, with a smaller-framed actor in a miniature shark cage to create the illusion that the sharks were enormous.

Imagens geradas por computador não foram usadas - O Jaws foi lançado em 1975, computadores eram muito menos poderosos naquela época.