"It is not possible to predict how much it will eat."

-I agree with this statement.

"But lets say I can know EXACTLY what each fish is going to eat each day because I give each fish a weighed ration in isolation of competitors."

-I'm not sure how you get to this statement from the previous sentence unless you are playing in the purely theoretical realm; both ends of the sentence don't occur in the real world. The end of the sentence about 'weighed ration in isolation...' can be attempted, but there is no way to know that any given fish will consume the entire ration which to me makes it a very shaky assumption.

" Its RW can range from 70 to 180. Another way of saying the same thing? The weight at that length can range from 0.70 lbs to 1.8 lbs."

-To me, this seems to contradict your idea that you can predict weight as opposed to length. The stated variation from 0.70 lbs to 1.8 lbs. is a huge variation.

Anyways, as I've mentioned before, to me it seems like a lot of stacked assumptions which leads me to think there's not much usable information from the exercise.

Of course, others may find it useful


Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."