Pond surface oily.


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My smallish pond has suddenly got an oily dark film on the surface. My 25 year old Tench has just died and I wonder if there is any connection.

What could be causing the oily look please?
 
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If this is a sudden problem, I would look at what happened to your Tench. Did you find a dead fish and an oily surface? The fish could have decayed and well... You mentioned smallish pond. Don't those fish grow to nearly 3 feet? How many gallons is your pond and do you have any other fish?
 

brokensword

...and not every pond in Michigan has a loon!
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the oil will inhibit the oxygenation process and esp in a small pond, that could be a critical factor. I'd try and skim it off or lay newspaper down and it'll stick to the paper, then pull away. Sorry for your loss.
 
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I will mention that when my small container pond got yucky (I don't know what happened) it developed an oil slick looking film on the surface -- iridescent, rainbow-y looking. No water changes would fix it. There were no mechanical parts in it whatsoever. I think it was something to do with bacteria and decaying matter messing up the water.
 
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do you have water lillys in your pond ? i sometimes get an oily slick on my wildlife pond when the water lillys start to breakdown.
 
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I will mention that when my small container pond got yucky (I don't know what happened) it developed an oil slick looking film on the surface -- iridescent, rainbow-y looking. No water changes would fix it. There were no mechanical parts in it whatsoever. I think it was something to do with bacteria and decaying matter messing up the water.
Thanks for response, I will watch it closely but I think it is down to decaying vegetation.
 
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the oil will inhibit the oxygenation process and esp in a small pond, that could be a critical factor. I'd try and skim it off or lay newspaper down and it'll stick to the paper, then pull away. Sorry for your loss.
thanks for advice.
 
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If this is a sudden problem, I would look at what happened to your Tench. Did you find a dead fish and an oily surface? The fish could have decayed and well... You mentioned smallish pond. Don't those fish grow to nearly 3 feet? How many gallons is your pond and do you have any other fish?
I have a few goldfish and some Rudd that seem well enough. The large black Tench was found on the lawn about 5 foot from the pond and was barely alive, just slight movement with the gills and body curved. Now dead.No decay on fish or marks where a predator would have had a go at it. I think the pond is about 500 galls.
 

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