Download or read book Recovery Plan for Nechako White Sturgeon written by and published by . This book was released on 2004 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: White sturgeon have been Red-listed (i.e. endangered) in 1998 by the BC Conservation Data Centre and Committee on the Status of Endangered Wildlife in Canada (COSEWIC). Cf. Introd., p. 1.

Download or read book Upper Columbia White Sturgeon Recovery Plan written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nechako River White Sturgeon Recovery Planning Summary of Stock Assessment and Oct 2 3 2000 Workshop written by and published by . This book was released on 2001 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the report of a workshop that focussed on three questions: the evidence for a decline in the recruitment of juvenile white sturgeon (Acipenser transmontanus) in the Nechako River, British Columbia; the potential causes of this decline; and the experimental management regimes that could be used to resolve uncertainties on the cause of recruitment problems and thereby direct mitigation strategies. After an introduction on the proceedings, section 2 reviews the data used to evaluate recruitment trends. It includes a comparison of Nechako stock age composition with Fraser River stocks, an indication of historical changes in Nechako stock age composition, and interpretations of the decline in catch rates 1982-99. Section 3 presents a sturgeon population model used to make additional interpretations of recruitment trends, and evaluates predicted estimates of recruitment patterns over time, based on current age-structure data. Section 4 summarizes the workshop discussions focussed on identifying potential causes of the recruitment failure. The final section summarizes discussions on the design of an experimental management program intending to identify successful strategies for recovering the Nechako white sturgeon stock.

Download or read book Recovery Plan for the White Sturgeon Acipenser Transmontanus written by Kootenai River White Sturgeon Recovery Team (U.S.) and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recovery Plan for the Pallid Sturgeon Scaphirhynchus Albus written by Mark P. Dryer and published by . This book was released on 1993 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Home to the Nechako written by June Wood and published by Heritage House Publishing Co. This book was released on 2013 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: The people of the Nechako region are not unfamiliar with hardship, environmental devastation and protecting what they hold dear. June Wood chronicles the history of the Nechako River and its region, covering the construction of the Kenney Dam, which changed forever the flow of the river and its tributaries; the controversial Kemano Completion Project, which threatened to doom the river further still; and the subsequent battles to protect the river and the communities affected by its altered flow. She also delves into the aftermath of the devastating mountain pine beetle epidemic that severely harmed the economy of the region. An active participant in many of the fights to protect the Nechako River, Wood is one of the most qualified people to speak on behalf of the land she calls home. She passionately introduces a river whose once forceful flow has been weakened to a mere trickle and sympathetically relays the harsh realities of environmental ruin--both to the river and the forest through unnatural and natural causes--while weaving in her personal narrative of the land that holds her heart.

Download or read book Breeding Plan for Nechako White Sturgeon written by Susan Marie Pollard and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recovery Plan for the Kootenai River Distinct Population Segment of the White Sturgeon written by and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Kootenai River White Sturgeon Recovery Implementation Plan and Schedule 2005 2010 Technical Report 2004 2005 written by and published by . This book was released on 2007 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kootenai River white sturgeon have been declining for at least 50 years and extinction of the wild population is now imminent (Paragamian et al. 2005). Only 630 adults were estimated to remain in 2002 from a population ten times that size just 20 years ago. Significant recruitment of young sturgeon has not been observed since the early 1970s and consistent annual recruitment has not been seen since the 1950s. The remaining wild population consists of a cohort of large, old fish that is declining by about 9% per year as fish die naturally and are not replaced. At this rate, the wild population will disappear around the year 2040. Numbers have already reached critical low levels where genetic and demographic risks are acute. The Kootenai River White Sturgeon Recovery Team was convened in 1994, provided a draft Recovery Plan in 1996 and the first complete Recovery Plan for Kootenai River white sturgeon in 1999 (USFWS 1996, 1999). The Plan outlined a four part strategy for recovery, including: (1) measures to restore natural recruitment, (2) use of conservation aquaculture to prevent extinction, (3) monitoring survival and recovery, and (4) updating and revising recovery plan criteria and objectives as new information becomes available. Sturgeon recovery efforts are occurring against a backdrop of a broader ecosystem protection and restoration program for the Kootenai River ecosystem. With abundance halving time of approximately 8 years, the Kootenai River white sturgeon population is rapidly dwindling, leaving managers little time to act. Decades of study consistently indicate that recruitment failure occurs between embryo and larval stages. This assertion is based on four key observations. First, almost no recruitment has occurred during the last 30 years. Second, thousands of naturally produced white sturgeon embryos, most viable, have been collected over the past decade, resulting from an estimated 9 to 20 spawning events each year. Third, Kootenai River white sturgeon spawning has been documented during most years from 1990 through 2005. Finally, no larvae and very few wild juveniles have been collected during recent decades despite years of intensive sampling. Concurrently, post-release hatchery reared juveniles (as young as 9 months of age at release) consistently exhibit successful growth and survival (Ireland et al. 2002). Recruitment has failed, in part because fish are currently spawning at sites where or when conditions appear unsuitable for successful incubation and early rearing. Research to date suggests that recruitment failure is caused by egg or larval suffocation, predation and/or other mortality factors associated with these early life stages. A variety of interrelated factors have clearly contributed to the decline of Kootenai white sturgeon; various hypotheses for recruitment failure are not mutually exclusive. Anders et al. (2002) suggested that Kootenai River white sturgeon recruitment failure is likely the result of additive mortality from: (1) increased predation efficiencies due to low turbidity, velocity, and an relative increase in predatory fishes, (2) a reduced number of eggs produced by a dwindling spawning population, and (3) spawning in habitat lacking interstitial space (embryo suffocation). Quite simply, the combined egg and embryo mortality from all biotic and abiotic factors kills more eggs and embryos than the dwindling wild population is currently capable of producing. Thus, natural recruitment failure appears to be caused by some combination of habitat and stock limitation, by the mechanisms mentioned above. Although past research has helped narrow the range of possible causes of natural recruitment failure, the relative significance of each potential impact remains uncertain because multiple ecological, biological, and physical habitat changes occurred simultaneously. This makes it difficult to choose among competing hypotheses and difficult to know where exactly to focus recovery efforts for maximum benefit. In an ideal world, specific recovery measures would be identified and implemented based on a series of complementary research investigations to definitively identify the proximate causes and specific mechanisms of recruitment failure. The acute status of Kootenai sturgeon and current inability to compartmentalize the complex ecosystem do not afford the luxury of time for exhaustive research studies on every potential mechanism of recruitment failure. Mechanistic studies cannot replace the need for experimental evaluations of implemented adaptive management experiments.

Download or read book Kootenai River White Sturgeon Recovery Implementation Plan and Schedule written by and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lake Sturgeon Recovery Plan 2018 2024 written by and published by . This book was released on 2018 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book White Sturgeon written by U.S. Fish and Wildlife Service. Region 1 and published by . This book was released on 1997 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recovery Strategy for White Sturgeon Acipenser Transmontanus in Canada written by and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Within Canada, White Sturgeon occur only in British Columbia and are divided into six populations, based on geography, demographics and genetics: the lower, middle and upper Fraser River; Nechako River; Upper Columbia River; and, Kootenay River. All populations were assessed as Endangered by COSEWIC in 2003; the latter four are legally listed under the Species at Risk Act (SARA). This document is a SARA-compliant recovery strategy for the four SARA-listed populations, and also provides recovery and management recommendations for the lower and middle Fraser River populations. This amended recovery strategy corrects the omission of the Minister responsible for Parks Canada as a responsible minister for the Nechako River population (original publication date: 2014-03-19; amended: 2023-01-25). The critical habitat identified remains unchanged from the original recovery strategy"--Provided by publisher.

Download or read book Assessment of Hazards and Risks Associated with the Recovery of Nechako White Sturgeon written by C. Williamson and published by . This book was released on 2004 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book White Sturgeon Recovery Conservation Program written by and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report on the Progress of Recovery Strategy Implementation for the White Sturgeon Acipenser Transmontanus in Canada for the Period 2014 to 2020 written by and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The "Report on the Progress of Recovery Strategy Implementation for the White Sturgeon (Acipenser transmontanus) in Canada for the Period 2014 to 2020" (progress report) outlines the progress made towards meeting the objectives listed in the "Recovery Strategy for White Sturgeon (Acipenser transmontanus) in Canada" (recovery strategy) (Fisheries and Oceans Canada [DFO] 2014) during the indicated time period for the 4 White Sturgeon nationally significant populations (NSPs) listed under the Species at Risk Act (S.C. 2002, c.29) (SARA): Upper Fraser River, Nechako River, Upper Columbia River, and Kootenay River. The progress report is one in a series of documents for this species that are linked and should be taken into consideration together; including the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) status reports (COSEWIC 2003; 2012), science advisory report from the recovery potential assessments (DFO 2007; 2016), and recovery strategy (DFO 2014)"--Introduction, page vi.

Download or read book Final Recovery Plan for the Shortnose Sturgeon Acipenser Brevirostrum written by Shortnose Sturgeon Recovery Team (U.S.) and published by . This book was released on 1998 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: