Members of Emmerdale's cast and crew, fans of the soap and colleagues from Blyth's time at Coronation Street are among those who have spoken of their admiration for him over the past few hours.
Writing on Twitter earlier today, Danny Miller - who plays Aaron Livesy on the show - commented: "A friend, a incredibly intelligent man, great father and husband! And a true gent!! God bless you mate and may you rest in peace! … Wouldn't be the person I am today without the legend that is Gavin Blyth! Amazing man! Love him!"
Lyndon Ogbourne - who recently bowed out as Nathan Wylde - said: "Gavin Blyth was a friend, a total gent and a true legend. For everything that he did for me, and everyone. RIP."
Suzanne Shaw - Eve Jenson in the soap - told her online followers: "Someone makes the world special by just being in it. Gavin RIP x"
Jake Roche - known for his guest role as Isaac Nuttall - said: "Just found out about the news of Gavin Blyth. Shocking. I owe him a lot. He had the final say on casting. RIP. a true gent and genius x"
Kirsty-Leigh Porter, who plays bad girl Roz Fielding, and Emmerdale's assistant producer Tony Hammond both spoke of how they felt "honoured" to have worked for Blyth, while programme director Lee Salisbury said that the show chief "will be missed so much".
Coronation Street actor Antony Cotton (Sean Tully) also expressed his sadness on Twitter, while Weatherfield scriptwriter Jonathan Harvey described Blyth as a "lovely man" and "a real laugh".
On the DS forum, meanwhile, Emmerdale fans praised Blyth's revamp of the village serial, which began when he took office in January 2009 and resulted in a significant boost in ratings.
> Click here to leave your tributes on the forum