I have no scientific basis to back the following: My own observations, over 40 years of "adopting" fish from poor conditions/environments, shows an average recovery of 2 1/2 to 3 times the duration of exposure to high nitrites. In other words, 3 months recovery for every month of brown blood development.
Of course, variables such as species resistance to nitrites, metabolism, DO requirements, etc will severely skew those time periods.
I would hazard a guess that, with pristine water chemistry, the pikes will have fully replaced their blood cells and alleviated most nitrite toxicity within a 3 month period. I apologize for this dubious prognosis but, research is still only skimming the surface of this subject.
