Brown trout spawn

[fishinwrench]

9 hours ago, ness said:

 

I discovered our spring branches flowing from the ground at 58 degrees were too warm during October and November when browns spawned.

Then why don't the Browns just adjust (like any other fish) and begin spawning later ?   

[tjm]

What's your theory? Why?

I'm guessing you hit on it; hours of light trigger the German trout. I'll guess hours of light also affect the springtime spawners, gets them moving, but because spring weather is fickle those species have added a temperature requirement to their genetics.  Wonder if the water temps are the same every where when the sunfish start to spawn?

[fishinwrench]

Yeah I dunno, fish are weird.

Some Ozark streams don't have goggle-eye for no apparent reason.   

[snagged in outlet 3]

8 hours ago, fishinwrench said:

Yeah I dunno, fish are weird.

Some Ozark streams don't have goggle-eye for no apparent reason.   

Amish poached them all out

[tjm]

9 hours ago, fishinwrench said:

Yeah I dunno, fish are weird.

Some Ozark streams don't have goggle-eye for no apparent reason.   

That's one I didn't know. But then according to the Federals they are an invasive in the Ozarks anyway. https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=373

[trythisonemv]

On 12/5/2019 at 8:12 PM, fishinwrench said:

That assumption would indicate that the triggering factor for spawning movements is the length of the day, rather than other more important things that would change as you moved N. S. E. or W.   Otherwise brown trout in this region would just spawn a bit later, right?  

Why would LMB in Louisiana and Georgia spawn earlier than LMB in Missouri ?  (Same species, not talking FL. bass)

White bass in southern Mo. begin spawning runs 2-3 weeks before the whites begin moving in mid-Mo.  So it is not " length of day", it is obviously weather/water condions.  Again....same species/just different places.

Here I go doubting the Scientists again, probably gonna get slammed.  🙄

This is he line of thought i was following as well...

[ness]

I think if the hatchery guys made it a priority they could select for later-spawning brown trout, or import other strains that do it already and maybe get some successful spawning going. They’ve tweaked rainbows over the years to spawn earlier, grow faster and be healthier. Of course there’s the need for large quantities of rainbows for the parks driving that.

But that still leaves me wondering why tailwater trout in AR can spawn but we can’t get them to do it in Taney without a helping hand. Wonder if something is fundamentally different about Taney? Or does AR have a different strain?

[tjm]

It is proven that some genetic diversity is lost in hatchery fish and that might explain why they don't adapt. Or it may be that Germany is so much colder than southern Mo. that they have adapted as far as they can but not enough to be a successful invasive. In places like New Zealand where the German trout have become invasive they have devastated the native species. 

Ness, does Taney have long shoals with gravel bottom where the water is still lake bottom cold and flow is relatively stable in fall? Do the Ar. tailwaters?  I ask because I'm not familiar with any of then- they are all outside my five counties.

[fishinwrench]

The rebar stretch is the end of the spawn habitat at Taney.  That ain't big enough to support much, and it gets trampled too much.

The White has shoal after shoal of good habitat.

[laker67]

3 minutes ago, fishinwrench said:

The rebar stretch is the end of the spawn habitat at Taney.  That ain't big enough to support much, and it gets trampled too much.

The White has shoal after shoal of good habitat.

I think this is exactly why it works on the white and not at taney