Evaluate Selective Fishing in the Willapa River, a Pacific Northwest Estuary
Washington Department of Fish and Wildlife, Fish Program, Science Division, 2007 - Bycatches (Fisheries) - 67 pages
Selective fishing is defined as the ability of a fishing operation to avoid non-target species and stocks, or when encountered, to capture and release them in a manner that minimizes mortality. Commercial and sport gears were tested in an estuary environment to selectively harvest adult hatchery coho (Oncorhynchus kisutch) and release natural coho and fall Chinook salmon (O. tshawytscha) bycatch. Experienced commercial fishers fished tangle nets (8.9 cm (3.5') mesh size, multifilament net) and gill nets (14.6 cm (5.75') mesh size, monofilament net) suitable for a coho fishery. To minimize mortality as much as possible, fishers also used careful handling techniques, a revival box, a shorter net, and shorter soak times. During the same time period, experienced sport fishers fished using barbless hooks and herring. Live fish were tagged and released for recovery in sport fisheries, commercial fisheries, at hatchery racks, and during spawning ground surveys.
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2003 Willapa test ANOVA capture and release captured ﬁsh Chinook bycatch Chinook captured Chinook salmon captured coho adults coho and Chinook coho captured coho released coho salmon Columbia River study condition at capture conventional gill detected difference detection probabilities Deviance Deviance/Df F egg to fry Estuary July 2007 Evaluate Selective Fishing eyed egg fall Chinook ﬁrst ﬁsh captured ﬁsh released ﬁsh were captured ﬁshed Fisheries ﬁve Forks Creek Hatchery gear type gill net captured hook and line hooking mortality immediate survival jaw tags long-term survival modiﬁed purse Nemah non-target Northwest Estuary July Null 27 observed Paciﬁc Pacific Northwest Estuary Percent post-release survival recovered reﬂect released ﬁsh result retum revival box selective ﬁshery selective ﬁshing Selective Fishing Methods species sport gear spring Chinook statistical power survival probabilities Table tangle and gill tangle net captured Tangle net Gill Vander Haegen water temperature Willapa River Willapa test ﬁshery