To answer your first question, I'll give you a quick history of what spawn-on-kelp is. We start off by building an enclosure with four logs. We build an aquarium, as such, out of web. We go out to the kelp beds and we pick kelp, a certain type of kelp, and we hang it just like socks on a clothesline. We hang thousands of leaves. We then catch the herring and we tow them gently towards the pond. We have a technique to put them into the pond alive.
Because the fish are at a certain ripeness in their maturity--in other words, they're anxious to spawn--they spawn on the web and on the kelp that we have suspended in the pond. After it gets to a certain thickness, we harvest that kelp from the pond, salt it down, and transport it to town, to be sold to the Japanese.
Basically, the interior is a leaf of kelp, or seaweed, and the eggs are adhering to both sides of the kelp.