Question
Dear Robyn Rhudy,
    Hi. My name is Derek Lee. I am an 8th grade student in California, and I am currently doing a science fair project that concerns with goldfishes. I was and still am researching on information and answer to my question, "How does the variation of temperatures affect the respiration rate of goldfishes? and Why?" Do you know an answer or explanation to this question? Please reply to my email regarding this topic. Thank you for your inconvenience.
From,
Derek Lee

Answer
As the temperature of the water increases, the metabolism of the goldfish goes up.  Fish then have to eat more and move more.  Their respiration rate and need for oxygen also go up.  Sadly, warmer water holds less oxygen than cooler water so fish can suffocate in water if it's too warm and not well aerated (stagnant).  Fish are cold blooded so their bodies are the same temperature as the water.  When cold, they don't need to do much (as long as it's warm enough for their survival).  When you start moving around and exercise, you too will breathe in and out more often to get that extra oxygen just like the warmer goldfish.

Robyn
fishpondinfo.com