Download or read book Operational Plan Situk River Steelhead Stock Assessment 2022 2024 written by Jason A. Pawluk and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steelhead Oncorhynchus mykiss are an important sport fish species in Alaska, and the Situk River hosts the state's largest steelhead sport fishery. The primary purpose of this project is to record abundance and size attributes of steelhead kelts in the Situk River. Observations of abundance and fish size are used to determine if run abundance and size characteristics are changing across time. Decreasing trends in steelhead kelt abundance or size could necessitate changes to sport fishing regulations to help ensure the sustainability of the Situk River steelhead population. Furthermore, kelt abundance in the Situk River is used in combination with other abundance counts of steelhead in Alaska to assess trends, both regionally and statewide, that help sustain all steelhead fisheries in the state. The Situk River weir is also used to gather fish mortalities to obtain matched scale and otolith samples from steelhead for aging verification and archiving. Observations of fishery-related wounds are also recorded to assess potential fishery and predation impacts on steelhead.
Download or read book Operational Plan Situk River Steelhead Stock Assessment 2020 2021 written by Jason A. Pawluk and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steelhead Oncorhynchus mykiss are an important sport fish species in Alaska, and the Situk River hosts the state’s largest steelhead sport fishery. The primary purpose of this project is to record abundance and size attributes of steelhead kelts in the Situk River. Observations of abundance and fish size are used to determine if run abundance and size characteristics of steelhead are changing across time. Decreasing trends in steelhead kelt abundance or size could necessitate changes to sport fishing regulations to help ensure the sustainability of the Situk River steelhead population. Furthermore, kelt abundance in the Situk River is used in combination with other abundance counts of steelhead in Alaska to assess trends, both regionally and statewide, that help sustain all steelhead fisheries in the state. The Situk River weir is also used to gather fish mortalities to obtain matched scale and otolith samples from steelhead for aging verification and archiving. Observations of fishery-related wounds are also recorded to assess potential fishery and predation impacts on steelhead.
Download or read book Situk River Steelhead Stock Assessment 2013 written by Brian Marston and published by . This book was released on 2013 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Situk River Steelhead written by Cheryl Bain and published by . This book was released on 2003 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Early Marine Growth Patterns of Situk River Steelhead Oncorhynchus Mykiss written by Matthew R. Catterson and published by . This book was released on 2017 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steelhead Oncorhynchus mykiss exhibit complex life-history patterns described by variable freshwater and marine residency periods, maturation patterns, and reproductive characteristics. Over 300 small populations of Steelhead are present in Southeast Alaska, and similar trends in abundance among these populations suggest the influence of population-regulating forces operating on a regional scale. The Situk River, near Yakutat, Alaska, supports the largest known population of Steelhead in Alaska. Stock assessment studies on this river have collected the longest set of biological data and scale samples for Steelhead in the state. For this study, retrospective scale pattern analysis of samples from Situk River Steelhead was synthesized with regional abundance information to investigate patterns in early marine growth among different life-history and demographic groups, as well as to explore linkages between growth, abundance, and marine environmental variables. Positive correlations were identified between freshwater growth, first ocean-year growth, and adult length, while first ocean-year growth was negatively correlated with second ocean-year growth. Early maturing Steelhead were found to have increased first ocean-year growth and reduced adult length relative to later maturing Steelhead, confirming connections between growth and maturation. Correlations in abundance among Southeast Alaska Steelhead populations suggest that marine and climatic drivers may impact these populations in a regionally coherent manner. Correlations among patterns in abundance also varied along a distance gradient: populations located closer to the Situk River were more correlated with the Situk River than more distant populations. Positive relationships between Gulf of Alaska sea surface temperature, North Pacific Gyre Oscillation, and Situk River Steelhead abundance further supported the importance of climate-driven marine conditions to Steelhead productivity. While conservation concerns for Steelhead in Southeast Alaska are currently minimal, proactive investigations into life-history diversity and population linkages may become more relevant with increased marine ecosystem variability related to climate change.
Download or read book Biological Characteristics and Population Status of Steelhead Oncorhynchus Mykiss in Southeast Alaska written by Samuel Clark Lohr and published by . This book was released on 1999 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steelhead Studies from the Situk River in Southeast Alaska 2002 2008 written by Brian Marston and published by . This book was released on 2012 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steelhead Studies from the Situk River in Southeast Alaska 2009 2011 written by Brian Marston and published by . This book was released on 2016 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a continuation of a monitoring project begun in 1994, a bipod and picket weir was used to count and sample steelhead Oncorhynchus mykiss kelts emigrating from the Situk River in Southeast Alaska from 2009 to 2011. Counts were 7,302, 5,335, and 7,458, emigrating kelts for 2009-2011 respectively. The 2009-2011 counts were below the long term (18 years: 1994-2011) average of 8,487 (-21%), and represent a 60% drop off the recent peak counts (10-15,000) seen within the last decade, but they were similar or above the previous low counts recorded historically (
Download or read book Situk River Wild and Scenic River s WSR Study written by and published by . This book was released on 1985 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Southeast Alaska Steelhead Studies 2001 written by Robert E. Johnson and published by . This book was released on 2003 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Southeast Alaska Steelhead Studies 2000 written by Robert E. Johnson and published by . This book was released on 2001 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Situk River Steelhead Studies 1990 written by Robert E. Johnson and published by . This book was released on 1991 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study used recording fathometer (sonar) and visual observations to count the early portion of the spring steelhead (Oncorhynchus mykiss) immigration to the Situk River near Yakutat in southeast Alaska.
Download or read book Southeast Alaska Steelhead Studies 1999 written by Robert E. Johnson and published by . This book was released on 2000 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Situk River Steelhead Trout Studies 1994 written by Robert E. Johnson and published by . This book was released on 1996 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Southeast Alaska Steelhead Studies 1998 written by Robert E. Johnson and published by . This book was released on 1999 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Southeast Alaska Steelhead Studies 1997 written by Robert E. Johnson and published by . This book was released on 1998 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Situk River Steelhead Trout Counts 1992 written by Brian J. Glynn and published by . This book was released on 1993 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report of a count of steelhead trout (Oncorhynchus mykiss) obtained at a weir on the Situk River (southeastern Alaska near Yakutat) using a float survey. This 1992 count was the lowest recorded suggesting abundance of steelhead in the Situk River remains low.
