A week later something very similar happened. One heavy fish, one light fish but their body composition was very similar
Any idea why or how this could be ?
Bass are basically hunters for their meals.
Whoever is the "better" hunter will get more food.
Any chance you caught the heavier fish first on both occasions? Being the most aggressive is only a benefit when you are at the top of the food chain. However, once humans are fishing in a pond, the bass are no longer at the top - so now aggression does have a penalty.