ls there some "spawning correction" in a survey like that?
Immediately pre-spawn, lady LMB should be at their highest RW. Shortly after the spawn they have ejected a significant portion of their weight, and "wasted" a lot of energy to create those eggs rather than sustainable body mass. Changing the sampling date by only a few weeks would give widely variant results.
Also, the biggest difference on the chart appears to be right near the end of life. Perhaps old females are more physically handicapped to hunt than males at the end of life, or have some biochemical senescence that makes it more difficult for them sustain body weight.
OTOH, perhaps just a few fat males survive past age 15? The steepness of the final slope for males might be partly due to a very small sample size.
