What Is "Fukurin"? Options

[CP]

I have a friend who does not receive much education,but a fish hobbyist nonetheless and owns prize winning kois.I have learnt much from him in terms of fish appreciation.

He always stresses on the importance of "pookoolink".That is what made the scales of the fish shine.Be it koi,discus,arowana or goldfish,"pookoolink" is a must before the fish can be a prize winner.

At Aquarama 2003,he has shown me many examples of prize winning discus and all these discus are rich in "pookoolink".

So I asked him WTF is "pookoolink"? Is it an English word,Japanese or Hokkien?
He doesn't know.All he knew is that it has something to do with calcium,and its like 'match flint'.

I suspect that it may be an English term.Any members heard of it before?

[CP]

Thanks for the article.

Quote from it:
"It is all but impossible to see fukurin on small fish and can be subtle and easily missed even on larger fish if one is not specifically looking for it, especially Type 2. Fukurin is easier to see on fish older than three years and larger than 60 cm."

So I guess the few shiny scales on my goldfish's back may not be Fukurin after all.And I think that not many can recognise a Fukurin.This subject is not as simple as I thought.When my friend is at my place he can point to me which fishes are developing the Fukurin.So he can be either not very sure himself or maybe he can recognise things that I cant.

p/s The prize winning koi belonging to my friend,a red tancho,had the type 1 fukurin giving the scale the "net" like looking effect.