Manganese?

[Phil Lilley]

Anyone know what high levels of manganese does to fish in a lake?

[fishinwrench]

Uh oh, did somebody spill their coffee ?  As long as it didn't have cream in it you're probably ok. 

It's probably good for them. 👍

[FishnDave]

Info I found:

"Numerous studies have shown that the effects of manganese on fish include impaired functions of the gill epithelium, such as hydromineral imbalance (Gonzalez et al., 1990."

and

"Manganese is a relatively common, yet poorly studied element in freshwater ecosystems, where it can be significantly bioconcentrated. The knowledge about the mechanisms of Mn toxicity on fish health is still limited. The aim of the present study was to assess the potential induction of oxidative stress and the antioxidant response after a 96 h waterborne Mn-exposure (at 0.1 and 1mM) in gill, kidney, liver and brain of goldfish (Carassius auratus). Mn 1mM induced an increase of lipid hydroperoxides, superoxide dismutase (SOD) and glutathione peroxidase (GPx) activities in all tissues with the exception of SOD inhibition in the brain. Particular response of catalase (CAT) was indicated-its inhibition in the liver and kidney, but activation in the gill. Exposure to Mn 0.1mM provoked most prominent changes in the liver and did not change the indexes in brain. These results strongly suggest that Mn exposure caused a generalized oxidative stress in the fish and revealed an organ specific antioxidant response involving a differential modulation of the SOD, CAT and GPx activities."

 

 

[Terrierman]

4 minutes ago, FishnDave said:

Info I found:

"Numerous studies have shown that the effects of manganese on fish include impaired functions of the gill epithelium, such as hydromineral imbalance (Gonzalez et al., 1990."

and

"Manganese is a relatively common, yet poorly studied element in freshwater ecosystems, where it can be significantly bioconcentrated. The knowledge about the mechanisms of Mn toxicity on fish health is still limited. The aim of the present study was to assess the potential induction of oxidative stress and the antioxidant response after a 96 h waterborne Mn-exposure (at 0.1 and 1mM) in gill, kidney, liver and brain of goldfish (Carassius auratus). Mn 1mM induced an increase of lipid hydroperoxides, superoxide dismutase (SOD) and glutathione peroxidase (GPx) activities in all tissues with the exception of SOD inhibition in the brain. Particular response of catalase (CAT) was indicated-its inhibition in the liver and kidney, but activation in the gill. Exposure to Mn 0.1mM provoked most prominent changes in the liver and did not change the indexes in brain. These results strongly suggest that Mn exposure caused a generalized oxidative stress in the fish and revealed an organ specific antioxidant response involving a differential modulation of the SOD, CAT and GPx activities."

 

 

That's what I thought.

[Johnsfolly]

If I am converting it correctly 1 mM of manganese would be 25 mg/L. That would be extremely high. Even the 0.1 mM would be 250 ug/L. I've seen avg concentrations of 24 ug/L. In surface waters across the country.

@Phil Lilley what levels are you concerned about?

[jdmidwest]

This is starting out like a Oneshot thread, in the dark for a while till something fills in the blanks.  Did Phil have surgery?

[Phil Lilley]

HAHA... I know the question was vague and suspicious.

Shane Bush told me a couple of weeks ago the city of Branson happened to inform him that they were finding high levels of manganese in Taney since last fall.  It improved when they ran spill gates in March and has been ok since.  He said it's caused by leaves and such decaying on the bottom of TR, which isn't a new thing.

Coincidence or not, this is the period of time that our fishing tanked.  And since the spill gates it has improved - back to normal.  My guy feeling is had nothing to do with it BUT the lack of bite for that long was unprecedented.  We've had 2-4 weeks of slow bite in past years but not 5 months.  It got to the point that we were questioning the number of fish in the upper lake so MDC did a shock survey and found "normal" numbers in late March.

[Ryan Miloshewski]

I bet it had something to do with it. Probably will never be able to tell, but it's a heck of a coincidence. Ducks avoid timber holes with high levels of tannic acid in them. It is produced from the decaying oak leaves, branches, twigs, etc. Kirk McCullough actually just posted about this if you follow him on social media. You can see the film on the water in places with high levels of it and boy do the ducks avoid it like the plague. Not sure if it makes them sick or it's just not fun to be in. 

[fishinwrench]

Well now, THERE is a thing that can't be blamed on "over-development".   Because there were more, and bigger, TREES back before bulldozers and chainsaws came along.  🤔

[fshndoug]

Probably all the dead trout decaying from being foul hooked in the outlets, gut hooked fish released by bait fishermen, boga gripped fish, or improper handling.