You seem to be getting things a bit mixed up. Yes "Lobe fins" are paddle like fins. The more primitive (prehistoric) fish like the Coelocanth and the Australian Lung Fish have pectoral fins described as "lobed fins". However these have absolutely nothing to do with "milt". Milt is the name given to the substance spread by male fish to fertilise the females ova (eggs). It is the equivalent of sperm in mammals.
lobster
the coelacanths
coelacanths
Coelacanths
the coelacanths
Coelacanths
the coelacanths
http://en.wikipedia.org/wiki/Actinopterygii They are ray-finned. Search for 'perch' on that page and it says on there =]
A goldfish is a ray-finned fish because its fins are supported by bony rays. Ray-finned fishes belong to the class Actinopterygii, characterized by fins made of webs of skin supported by bony spines or rays. This differs from lobe-finned fishes like lungfish or coelacanths, which have fins with a fleshy, lobed appearance.
Oh, dude, you're like so close but not quite there. The sturgeon fish is actually a cartilaginous fish, not a lobe-finned fish. So, like, they're kind of distant cousins in the fish family tree, but not quite the same. Keep swimming in that sea of knowledge, my friend!
Goldfish have 1 dorsal fin, 1 caudal fin, 1 anal fin, 2 pectoral fins and 2 ventral (pelvic) fins. They do not have a spiny Dorsal or an adipose fin so that makes them a 7 finned species. Breeders have devloped goldfish with different types of split Caudal (tail) fin but they are still single fins. These "sports" are commonly called Veiltailed, or Fantailed fish. (There are many other names of "goldfish sports" too). To the best of my knowledge they do not however have 8 fins. They have seven fins but the tail has been modified by selective breeding to look like more than one fin. (Breeders have also developed a type that has no dorsal fin which makes it a 6 finned fish).
There are several groups and various forms of fin. If you mean "Ray-finned fish" they are the commonest fish which are the ones available at pet shops like Goldfish and include all the usuall tropicals.