Questions tagged [limnology]

The science of inland waters, posts on Biology SE should focus on the biological aspects of this discipline.

10 questions with no upvoted or accepted answers
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Strange planarian/leech like creatures found with California blackworms

I've been trying to ID these things myself but to no avail. They came with a shipment of California blackworms from Florida. I've heard so many ID's and apparently it's not uncommon to get these ...
3
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2answers
126 views

Is this aquatic plant duckweed or something else?

This plant has been growing in my pond for quite a time now. It multiplies in large numbers rapidly. Some told me it is duckweed or is it something else?
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What is this trilobite-like creature?

This was found under a rock in a freshwater creek in Maryland. Stayed like this for while, then stretched out long, then contracted, and then JUMPED off the rock back into the water. Looks like a ...
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0answers
45 views

What does this skull belong to?

I was cleaning out my pool with a leaf scoop the other day and found a small object, which I assume to be a sort of skull or cartilaginous structure of something that had died. I live in Sydney, ...
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0answers
36 views

Oxygen supply in a trickling filter

I'm using a 300l/h trickling filter consisting of 4 round chambers in vertical alignment with 11cm diameter, 5cm height and 5cm distance for the trickling (100 to 500 holes per level) in a 15cm pipe. ...
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0answers
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Is an ephemeral stream in an unflowing state considered a lentic or lotic environment?

I ask this question because I would like to discuss attributes of streams, rivers, bayous, and etc. in a text I'm writing and would like to simply refer to them as "lotic" environments. ...
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35 views

WC small organisms ID?

I have reached the end of my Winogradsky Column experiment, but out of interest I have kept them for a little longer. I have noticed small bug- and worm-like organisms appearing in some of my columns. ...
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0answers
36 views

How do fish persist in the upper parts of mountainous rivers with waterfalls?

I was recently traveling in a remote mountain region and hiking alongside a very small river. What caught my attention was the fish in the small ponds under the waterfalls. These ponds were just a ...
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Why doesn't alum coagulate my cyanobacteria?

My collected rainwater has a pronounced blue-green tint which I believe to be due to the presence of cyanobacteria. I have been trying to remove the cyanobacteria using aluminium sulphate, but it ...
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1answer
904 views

Why sea water fish can't survive in Fresh water?

Why the sea water fish can't survive in fresh water? What really happens to the fish if it get into fresh water from sea water. What are the possible reason... Does it really depends osmotic ...