The fishing techniques used by the Stó:lō vary greatly, depending on the fish habitat and fish type. Dip netting for salmon in the narrows of the Fraser is one of the primary fishing techniques utilized to catch salmon during the salmon spawn. Netting techniques used in the Fraser Canyon are tightly linked with wind-drying preservation-a method used to preserve the large amounts of fish caught during the summer. The narrows of the river in the Fraser Canyon are so productive for this type of fishing that fishing spots are claimed as territory by family groups. Also, these fishing spots are designated to different family members during different times of the salmon spawn, giving those of the highest rank in the family, such as elders, the most productive times. Gill nets have also been used in the Fraser Canyon and the Lower Fraser to catch both sockeye and spring salmon. In the Lower Fraser, harpooning is used in the shallow waters of the Fraser River to catch a variety of salmon, and is also used for catching sturgeon in deep water all year round. Weirs can be constructed to catch fish in smaller rivers, and a variety of hooks and hook-and-line techniques are used in various waterways.