GREEN BAY, Wis. (AP) — The Wisconsin Department of Natural Resources says the sturgeon spawning season is about to begin. The traditional rite of spring in Wisconsin is a big draw for nature lovers who come to the Wolf, Fox and Embarrass rivers each year about this time. DNR biologist Ryan Koenig says male sturgeon have been "cruising" the Wolf River. That means spawning will likely start Thursday or Friday with heavy spawning activity by the weekend. The large, ancient fish spawn in the shallow, rocky areas of the rivers, so it's easy to get a look at a unique fish that spends most of its life in deeper water. Sturgeon guards are expected to start work Thursday. The volunteers make sure the sturgeon aren't poached.