Size May Not Matter?

I still have not run any statistical analyses on the data we've collected thus far, but today we added another muskie - 31 inch - to the sample which gave us some interesting results. After battling the muskie for four minutes, the blood glucose and lactate levels were almost exactly the same as the 43.5" caught the other day in 11.5C (~52F) water. The fish today was captured from 9C (48F) water and its glucose and lactate values were 3.2 and 7.3 mmol/l as compared to 3.0 and 7.2 mmol/l for the 43.5 incher. The lack of variation could potentially be explained in the water temp decrease, but is interesting to note that there was very little variation in blood glucose and lactate levels despite a size differential of over 12 inches.