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October 26, 2018

2018 Tongariro spawning runs?

Anglers are still anxiously asking for more updated info on the timing of 2018 spawning runs?.
Some canny fishos who live within a day trip have been very patient waiting and delaying their annual fishing safari to TRM  hoping to time it during the runs.
By now they are almost in panic mode.  They have been waiting for TRM or other fishy reports to confirm that the BIG runs have started before venturing out?  But we have failed them.
All we have reported on are steady dribs and drabs – small pulses of trout over night but no “major” runs so far.  By a major run we mean when the Bridge Pool is classified as combat casting and anglers are lined up and all catching their limit every morning.
But so far in 2018 we have not seen that.
The river is still reasonably full of fish – a mixture of fresh run maidens and recovering trout – but in these low conditions many have found them too spooky.   Now they may have missed out altogether.   How frustrating!
The TRM inmates who have persevered – see images above  – have enjoyed the low conditions.  It has been a very late season.
Why?  Blame global warming?…
SWMBO has to find someone or something to blame so why not the weather!
The more experienced (aka “old”)local anglers with many years of chasing the spawning runs tell us the Tongariro catchment has not had enough decent rain to encourage a big spawning run.
The following graphs from Genesis tell the story.
The graph above indicates the Tongariro cumecs flow at Turangi over the last three months.  Now – at 23 cumecs – is as low as it gets.  The chart below reflects the rainfall over the same period.  Even TRM flower pots and gardens are struggling with the dry conditions.
TRM tried to report on this previously on September 6 – see below – but the dry warm spring conditions have continued.  Anglers from West Island may have difficulty in our interpretation of local drought conditions but for us it has been a dry spring – so far….  The best explanation is still the 35 year old article below – when a specific study was made on the Tongariro River.
But first is DOC’s fishery facebook report dated 17 October:

A recent wet spell prompted the biggest run of trout we’ve encountered so far this season in the Waipa trap. A Fishery Ranger arrived at the trap on the Waipa Stream high in the Tongariro catchment last Friday morning, to discover 45 fresh-run rainbow trout had entered the upstream pen overnight. Sizes varied but the larger fish were in particularly good condition – a consistent feature this year.

Interesting to note that 35 of the trout were hens and 75% of those were maidens – running for the first time. Jacks are always the first to run and make up the bulk of early season captures, so the greater proportion of hens simply confirms that spawning is now in full swing.

Anglers are increasingly reporting high trout numbers in spring, and this trap data supports their experiences. Previous trends suggest anglers can expect to see fresh fish continue to enter the rivers following rain, throughout October and even into November. Plenty of recovering fish will also feature in catches.

September 6, 2018

Taupo trout spawning runs?

With a late season (?) anglers have still been asking SWMBO difficult questions about trout spawning habits as they have failed to run on time?  (“on time” means when the anglers were here.)  Many have been regularly visiting Turangi at about the same time every year for many years so they confess their frustration when the trout do not arrive on time.  Why is that?

So TRM have dug out some historic specifications to reply… to compare how it used to be.  Back then the trout were obviously better trained to keep to the anglers’ time table.  Some suggest the spawning patterns have changed since?  This provides  interesting reading to see how much has changed as a specific study was done on the Tongariro River.

Following copied from the excellent book “LAKE TAUPO” (x- Page 126) co-ordinated by D J Forsyth & C Howard-Williams as part of the old DSIR Information series in 1983 – 35 years ago but still relevant.  The chapter on “TROUT FISHERY – HISTORY & MANAGEMENT” was contributed by P. Burstall – a well known former Conservator of Wildlife in the Department of Internal Affairs – before it was converted into DOC – the Department of Conservation.  Some frustrated fishless conspiracy theorist anglers (aka inmates) have suggested DOC should be blamed for changes to the spawning runs?

“In the Taupo rivers and streams there appeared to be three distinct spawning runs:  (1) a small summer run mostly of immature fish of both specieswith brown trout dominant; (2) an autumn run of spawning brown trout, and (3) a winter run of spawning rainbow trout.  Spawning itself followed about one month later.  A few rainbow trout spawned throughout the year and there was considerable overlap of spawning activities between the two species.

The males ran before the females which remained about two months in the stream, losing 25% of their body weight.  Males remained for about three months in the streams and lost about 30% of their body weight.  There was about 20% natural mortality during and following spawning. Stream flooding seemed to stimulate a mass return of fish to the lake, with few rainbow trout remaining in the tributaries in summer.  Body metabolism and development of the reproductive organs occurred at the expense of body flesh as little or no feeding occurred during spawning.  After spawning the fish took about eight months to recover condition.  This showed that poor conditioned fish were not deceased as was thought in the 1940’s but were post spawners or kelts.

After spawning the fish ranged throughout the lake, but usually returned to the parent stream for the next spawning.  They rarely migrated into neighbouring tributaries, and never entered tributaries on the opposite side of the lake.  Rainbow trout spawned in successive years, although brown trout sometimes missed a year…

Although brown trout make up no more than 2% of the anglers catch, trap data indicated that they made up approximately 20% of the total trout population, had a higher weight and lived longer than rainbow trout.

A specific study was made on the Tongariro River.  All tributaries were trapped simultaneously for 14 days to collect data on the total angling effort.  The results showed that anglers caught mostly older fish in the river.  These had a heavier average weight but a lower than average condition factor.  As these fish were all post spawners they were generally unacceptable to anglers.  The Tongariro River data were similar to those obtained from traps in other tributaries all of which showed that anglers tended to catch old post spawning fish.  This is important when considering changes to the angling season.”

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