a net for two

Corbie had swum out to the island after catching a glimpse of the interesting structures from the shore. It hadn't been a planned stop on her trip, but she couldn't resist. And as she rounded the corner of the island, she was glad she hadn't, because another wolf seemed to be setting something intriguing up on the beach. "Excuse me," she called out to the stranger. "I don't mean to be a bother, but I was curious about what you were doing." It seemed to be some cordage all woven up and attached to a pole in the sand, but having never tried nor even seen someone net fishing, she couldn't quite fathom what it was all for. Some sort of enclosure for something? But why set it up on the beach, where they couldn't get anything to eat?