UCSB Science Line
Sponge Spicules Nerve Cells Galaxy Abalone Shell Nickel Succinate X-ray Lens Lupine
UCSB Science Line
Home
How it Works
Ask a Question
Search Topics
Webcasts
Our Scientists
Science Links
Contact Information
How much oxygen should a fish really "take in"?
What should the water temperature be?
Answer 1:

It really depends on the fish. Trout do best in cool, fast running streams with lots of oxygen. Catfish like the warm, slow moving areas that may not have a lot of oxygen. The fish that people keep as pets have many different needs too.

You can see how fast a fish is breathing by watching the gill cover(operculum) move. You will see that they breathe faster in warm water.One reason is that warm water holds less oxygen. Another is that the warmer water will speed up the metabolism of the fish, which means they need more oxygen.

The good news is that putting too much oxygen in the water won't hurt the fish, so if you're concerned that your fish isn't getting enough oxygen, you can put a simple aerator in the tank to bubble air into the water.

You can also read up on your fish to see what its specific needs are.This site:
click_here
has a pretty long list of fish that you might have.

If your fish needed more oxygen than it was getting, and you added an aerator to its tank, would its breathing rate increase or decrease?

Thanks for asking,

Answer 2:

Unfortunately to answer this question, I would have to know which species offish you are talking about.At least for b) temperature is very related to the species. Tropical fish require a much warmer environment than say an arctic fish. If this is concerning aquarium fish, most stores sell fish that do best around 74 - 78 deg F although some fish (like goldfish and betas) do well at a temperature as low at 40 degF.

Colder water tends to have a higher dissolved oxygen than warmer, tropical waters. So an aquarium with a warmer environment should not contain as many fish as a cooler tank.

If you have a specific species or environment in mind, please let scienceline know and I will try to get a more specific answer for you.


Answer 3:

a. Typical water that is agitated by the atmosphere should generally be good, if the water temperature is what the fish is used to; oxygen is less soluble in warmer water.

b. Depends on the fish - a tropical reef fish will like tropical water. Arctic Char like water that is close to freezing.



Click Here to return to the search form.

University of California, Santa Barbara Materials Research Laboratory National Science Foundation
This program is co-sponsored by the National Science Foundation and UCSB School-University Partnerships
Copyright © 2015 The Regents of the University of California,
All Rights Reserved.
UCSB Terms of Use