Walter Bushell wrote:

.....

Dylan wrote:

.....

Do you mean that cave fish that have evolved into blindness are
more
fit than their ancestors?

[Someone wrote:]

That may very well be the case - the cost of building eyes is not
insubstantial.

Walter Bushnell wrote:

And a large part of the brain to support it. It's like those battle
tgames where you are given a number of points and are allowed to buy
attributes for you characters with those points.

There are more rats in NYC than humans. And I am sure more
cockroaches
than rats.

.....

Dylan writes: Point taken. Now can you give me an example - such as
long feelers - which might make blind cave fish more fit than their
cousins who are still sighted but have not evolved the feelers? I'm
suggesting feelers because while you (and others) have suggested that
the blind cave fish could well be better fitted because they could
transfer some of their energy budget away from building/maintaining
eyes to something else. The theory makes sense. Any real-life examples?
Any thought-experiment examples? I learn best by contemplating
real-life examples. Thanks.