There were two wins and four crews progressed directly to their respective A finals after an encouraging first morning for the GB Rowing Team at the World U23 Championships in Plovdiv, Bulgaria.
Jack Beaumont took first place in his men's single scull heat and the women's double scull of Georgia Francis and Mathilda Hodgkins-Byrne also impressed with a mature win.
Both the men's and women's lightweight quadruple scull crews produced solid races to finish runners-up in their heats and reach the A finals, as did the lightweight men's four and the women's pair of Rowan McKellar and Holly Norton.
Sir David Tanner, GB Rowing Team Performance Director, said: "The first day of racing at the World U23 Championships is always a good learning experience for both our boats and the other countries.
"That was definitely the case for the British crews this morning. We had some strong results, with four crews progressing directly to their finals, and there are others who can step on over the next couple of days and build on what they achieved this morning."
Both lightweight quads finished runners-up to France in their respective heats, with Maddie Arlett, Ellie Lewis, Flo Pickles and Lucy Cruxton crossing the line in 6:55.47 to finish comfortably clear of third-placed Austria.
It was a similar story in the men's race as Steven Parsonage, Joel Cassells, Samuel Mottram and Jamie Copus took the second qualifying spot behind France in 6:06.69.
Cassells and Copus were both part of the lightweight men's four which won silver at last year's World U23 Championships in Varese, Italy.
This year's crew of Ed Fisher, Ben Reeves, Jonathan Jackson and Alastair Douglass booked their place in Sunday's final by finishing runners-up to Italy in their heat, crossing the line in 6:30.70.
McKellar and Norton dug deep to reach the women's pair final at the first attempt. They held second place throughout their heat behind the American pair but came under pressure from Norway, who put in a big push with 250m to go.
However, McKellar and Norton responded well to the danger and secured the second qualifying spot for Saturday's final in 7:15.71.
The men's pair of James Rudkin and Tom George also looked impressive as they led for almost all of their heat, establishing a good rhythm.
They were pipped to first place by an experienced Romanian pair but, with the top three progressing, had done more than enough to secure their berth in Saturday's semi-finals.
Beaumont - a bronze-medallist with the senior men's quad at this year's European Championships - made a confident start to his single scull campaign.
With only the winner of each heat going straight through to the semi-finals, Beaumont quickly established the lead and held off a challenge from Serbia's Andrija Sljukic around the halfway mark before easing away to win by clear water in 7:10.25.
The first GB win of the day came courtesy of a mature performance from Francis and Hodgkins-Byrne in the women's double scull.
Second to Italy for much of their race, the British crew remained composed throughout before rowing through their opponents to secure first place and a semi-final spot in 7:08.39.
The men's eight also rowed well to finish a strong second behind Romania in the last race of the day involving a British crew.
Only the winners progressed directly to the final but Rory Gibbs, Will Hall, Harry Leask, Rufus Scholefield, Henry Millar, Oliver Knight, Henry Swarbrick, Morgan Bolding and Harry Brightmore have a good basis to build on in Friday's repechage.
The first race of the day saw the women's four of Emily Ford, Melissa Wilson, Holly Hill and Sam Courty get off to a strong start and lead their heat after 500m.
Canada and the United States pushed clear in the second half of the race, with Canada eventually taking the only qualifying place for the final, but the British crew put in a solid performance to finish third in 6:45.40.
They will race again in the repechage on Friday morning, as will the men's four of Richard Clarke, Ross Jarvis, James Johnston and Lewis McCue who also placed third in their heat in 6:02.37. Romania took the sole final berth.
The men's quad of Tom Barras, Frazier Christie, Andy Brown and Andy Joel were off the pace in their heat and, despite a good push around the 1,500m mark, were unable to make up the ground required to claim a top-three place. They have another chance to reach the semi-finals in tomorrow's repechage.