Anglers from as far afield as Whangarei have turned out to enjoy a 'positive” opening of Rotorua's celebrated trout streams on the first day of summer – but Fish & Game say the best is yet to come.

Lake Rotorua tributaries, including the upper Ngongotaha Stream which have been closed over the spawning season, re-opened for summer angling yesterday morning.

Fish & Game say the best is yet to come with the trout fishing season. Photo: Supplied.

Fish & Game staff who turned out to survey anglers say some caught around six-to-eight fish over the course of the morning, with more rainbows landed than brown trout.

'It was a positive opening with plenty of fish there to catch, and anglers had lots of room to move up and down the stream,” says Fish & Game officer Matt Osborne.

'It's coming to the end of the rainbow spawning run, and browns are only just starting their summer escape from Lake Rotorua's increasing water temperatures.

'When the lake hits 19 C it's a real trigger and brown trout will bolt up the streams in search of cooler waters. Rotorua is just reaching that figure now.”

Matt says their monitoring of trout movement holds the prospect of some excellent fishing. Trout are trapped part way up the Ngongotaha Stream to be weighed and measured before being set free to continue their travels.

Over 10 nights, 14 rainbows were weighed in, averaging at just over 2kg with the biggest 3.5kg and 62 centimetres long – 'the biggest we've seen in a while up the Ngongotaha,” confirms Matt.

The biggest brown trout was a 5kg female with the average brown size 3.25kg.

Matt says the number of fish trapped (103 browns and 14 rainbows) and their good condition bodes well for summer fishing.

'Their improving condition reflects improvements in Lake Rotorua's water quality.”