Kenai River Sockeye Salmon Restoration Study 53

Author : William J. Glick
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)

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Download or read book Kenai and Kasilof River Sockeye Salmon Inriver Passage and Escapement Studies, 2022–2024 written by William J. Glick and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-frequency Identification Sonar (DIDSON; Belcher et al. 2002) is used annually to estimate sockeye salmon Oncorhynchus nerka passage into the Kenai River of Upper Cook Inlet (UCI), Alaska (Figure 1). Adaptive Resolution Imaging Sonar (ARIS) is used to estimate sockeye salmon passage into the Kasilof River. Both multi-beam sonar systems are manufactured by Sound Metrics Corporation with ARIS being an upgraded replacement of the DIDSON. Sonar passage estimates of sockeye salmon are used for inseason management of UCI commercial fisheries, as well as personal use fisheries in the Kenai and Kasilof rivers, to achieve established escapement goals and inriver run goals. The current sustainable escapement goal (SEG) for sockeye salmon in the Kenai River is 750,000–1,300,000 fish. The inriver goal for sockeye salmon in the Kenai River is 1,000,000–1,200,000 fish if the forecasted return estimate is 2,300,000; 1,100,000–1,400,000 fish for a forecasted return of 2,300,000–4,600,000; and 1,200,000–1,600,000 fish for a forecasted return of 4,600,000 (Marston and Frothingham In prep). The Kasilof River optimal escapement goal (OEG) is 140,000–370,000 sockeye salmon, with a biological escapement goal (BEG) of 140,000–320,000. (McKinley et al. 2020). Fish wheels are used to capture migrating salmon for 1) species apportionment; 2) to estimate age, length, and sex composition of the sockeye salmon escapement; and, 3) to collect genetic samples as needed. Historical sonar passage and escapement data for the Kenai and Kasilof rivers (Table 1) is provided in yearly Regional Information and Fishery Data Series reports as exhibited by Glick and Marston (In prep). This plan outlines how sonar sampling and logistical operations will be conducted for each of these sonar enumeration sites.