What is a large fishnet that hangs vertically called?

A seine is a large fishing net that is traditionally hung vertically in the water, often used to catch fish by surrounding them. This method allows for the effective capture of fish as they swim into the net's area. The design of a seine allows it to trap schools of fish, making it an important tool in commercial and artisanal fishing.

The other options do not relate to fishing or nets. 'Satiate' means to satisfy completely, often used in context with hunger or desire. 'Saturnine' describes a person who is sluggish or gloomy in temperament, and 'sententious' refers to someone who tends to be preachy or full of maxims. These terms do not pertain to fishing nets or the act of fishing, which is why they do not fit as the correct answer.