Otter edged out Castleford 11-9, with Daniel Shunn, Tim Chambers, Mate Nyaka and Omiris Pantazis all contributing two goals. Penguin beat Cheltenham Spartans 16-9, Giampaolo de Rosa adding another eight to keep him at the head of the division's top shots list.
Lewis Daly was on target five times as Manchester Hawks defeated Southampton 14-7. Birmingham's fast start set up victory over Croydon Amphibians, 12-10. Nathan Wilkes (2), Drazen Videc (2), Jason Culloo and Hamish Scott were the marksmen as Birmingham raced into a 6-1 lead by the start of the second period.
Photo (Trevor Hyde): Croydon's Kevin Steele (left) takes on David Lane, of Birmingham, who won 12-10.