However, I'd bet dinner at a good restaurant (at least a couple steps up from - choke - McDonalds) that dead brine shrimp could cause an excellent environment for velvet (Oodinium or Piscinoodinium species) to bloom. Then we have adult fish covered with a sheen of tiny dots. Fry immediately have clamped tails and then go away. So please don't let uneaten b.s. accumulate in a tank and decay.

That is also why I carry on about having small pond snails in a fry tank and, as a matter of fact in my livebearers tanks. I even leave snails in killie tanks, although in the tanks with de-mineralized water the snails don't fair too well.

Brine shrimp do have carotenes which help with the fish's colors. Their shells can act as a laxative. However when one considers the meat to weight ratio, other foods may have more nutrition per unit. If you have a good brine shrimp supply, just feed a little more shrimp.

Bran shrimp should clear the fish out pretty quickly too. ;)

Lightly salted tanks are useful with fry, not only because the salt seems to offer a little protection against velvet, but helps the freshly hatched baby brine shrimp, bbs, to live a couple of hours longer than they would in a freshwater aquarium.

Do you have access to live brine shrimp in the Netherlands? Are brine shrimp eggs as incredibly expensive there as they are in the US?

If you - or I -really want to research brine shrimp, a Google search revealed a lot of places around the world doing research on them. Among a lot of others, there is a US research center
http://www.snarc.ars.usda.gov/Research/ludwig.htm

and the most famous one at Ghent:
http://allserv.ugent.be/aquaculture/general/general2.htm

"Again, thanks for the thinking!" Well.... I try every now and again. ;)