Subject: Is there different amounts of catalase in different vertebrae?

I have recently carried out an experiment to try and find out whether or not 
different vertebrae (cow,sheep and fish) have varying levels of catalase. I 
tried to determine this by collecting the gas given off in the experiment, and 
the liver that produces the greatest amount of gas in the quickest time, would 
be the one with the most enzymes. i predicted that the bigger the animal such 
as the cow, the more enzymes present. 

However to my surprise after having obtained my results, it became clear that 
the only vertebrea that produced the most oxygen gas was the fish. The sheep 
and the cow liver produced the least amount (10cm3). i thought that maybe there 
may be some procedural errors and checked the system for any leaks. I carried 
out the same reaction with manganese dioxide, and found that everything was 
working as it should. T am therefore puzzled as to the reason why this has 
occured and finding it quite challenging, explaining the results i have 
obtained.

thank you in advance  

Re: Is there different amounts of catalase in different vertebrae?