With a water temp at 61F one would normally think the LMB have not spawned. Normal spawning temp is about 65- 68 F. However it is not an all at one time event and spans a range of Temps. Some research on trophy LMB spawning indicates that the largest LMB may well spawn just before the rest. It is thought that this is a possible survival mechanism as the first spawned LMB yoy should have an advantage in feeding and size provided a cold snap does not get them or their early plankton food supply or a hungry predator. Based on the provided size of these fish they could be large early spawners. If so they may have lost as much as 30% of their per-spawn weight.