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Book Natural Mortality Rates of Adult Pacific Herring Clupea Pallasi from Southern British Columbia

Download or read book Natural Mortality Rates of Adult Pacific Herring Clupea Pallasi from Southern British Columbia written by Ronald W. Tanasichuk and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Data for over 904000 Pacific herring (Clupea pallasi) seined or gillnetted in British Columbia between 1951 and 1998 was used to estimate age- and year-specific adult natural mortality rates. Apparent sampling bias precluded using data for all stocks before 1980 and for northern British Columbian stocks since then. For the southern (West Coast Vancouver Island, Strait of Georgia) stocks, the instantaneous natural mortality rate (M) for adult herring is an increasing exponential function of age. Surplus energy requirements for gonad recrudescence and overwintering appear to cause the death of adult herring. It was found that, based on an experiment using a hypothetical herring population and assessment model or regression estimates of M, the escapement model overestimates survival, relative to the age structured model and the predictive regression, for west coast Vancouver Island herring; the three mortality estimates generate similar abundance trajectories for Strait of Georgia herring. It is suggested that the described sampling bias be considered by herring stock assessment models.

Book Canadian Journal of Fisheries and Aquatic Sciences

Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2002 with total page 1164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book An Index of Relative Biomass Abundance and Condition of Juvenile Pacific Herring Clupea Pallasi in the Strait of Georgia British Columbia

Download or read book An Index of Relative Biomass Abundance and Condition of Juvenile Pacific Herring Clupea Pallasi in the Strait of Georgia British Columbia written by Jennifer Lynn Boldt and published by . This book was released on 2015 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: Small pelagic fish, such as Pacific Herring (Clupea pallasi), are an important prey species for a variety of predators and, in the case of herring, are also culturally and commercially important. The Strait of Georgia juvenile herring and nearshore pelagic ecosystem survey provides time-series information that can be used to estimate the relative abundance of age-0 herring, potentially forecast recruitment to the adult spawning population, and represents trends in prey availability to predators. This document includes methods, results and discussion, and a summary.--Includes text from document.

Book The Effects of Some Constant and Some Changing Conditions of Salinity on the Development and Mortality of the Eggs and Larvae of the Pacific Herring CLUPEa PALLASII Cuvier

Download or read book The Effects of Some Constant and Some Changing Conditions of Salinity on the Development and Mortality of the Eggs and Larvae of the Pacific Herring CLUPEa PALLASII Cuvier written by Robert Graham McMynn and published by . This book was released on 1951 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Quantifying the Magnitude and Mechanisms Driving Pacific Herring Clupea Pallasi Egg Loss on the Central Coast of British Columbia Canada

Download or read book Quantifying the Magnitude and Mechanisms Driving Pacific Herring Clupea Pallasi Egg Loss on the Central Coast of British Columbia Canada written by Brittany Elizabeth Keeling and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pacific herring (Clupea pallasi) play a fundamental ecological and socio-economic role in marine ecosystems and have exhibited declining trends in British Columbia, Canada, over the past decade. The rate of herring egg loss following spawning events is a key parameter used to estimate population productivity, however, it is highly uncertain. We quantified the magnitude, spatial variation and mechanisms driving egg loss along BC's Central Coast using observational surveys and an experiment. Depending on the modeling approach, we estimated regional egg loss rates (Z) ranging from 0.152 ± 0.022 to 0.177 ± 0.027, the equivalent of 59-75% eggs loss over 6.8 days, the average lag between spawn deposition and survey. Loss rates varied by 4.5 orders of magnitude among sites. Spawn area was found to positively influence egg loss rates based on our observational study, while evidence from our experiment suggests that predation and habitat type were strong drivers of loss. Modeling approach, parameter uncertainty, and site-level variability in egg loss rates need to be accounted for when estimating Pacific herring abundance and its associated uncertainty.

Book Population Structure of Herring Clupea Pallasi in British Columbia Determined by Microsatellites with Comparisons to Southeast Alaska and California

Download or read book Population Structure of Herring Clupea Pallasi in British Columbia Determined by Microsatellites with Comparisons to Southeast Alaska and California written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Population structure of herring Clupea pallasi in British Columbia determined by microsatellites with comparisons to southeast Alaska and California

Download or read book Population structure of herring Clupea pallasi in British Columbia determined by microsatellites with comparisons to southeast Alaska and California written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Population Structure of Herring Clupea Pallasi in British Columbia Determined by Microsatellites with Comparisons to Southeast Alaska and California

Download or read book Population Structure of Herring Clupea Pallasi in British Columbia Determined by Microsatellites with Comparisons to Southeast Alaska and California written by T. D. Beacham and published by . This book was released on 2002 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book PICES Scientific Report

Download or read book PICES Scientific Report written by and published by . This book was released on 2001 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Early Life History Characteristics of Pacific Herring Clupea Harengus Pallasi Valenciennes 1847 in the Strait of Georgia British Columbia

Download or read book Early Life History Characteristics of Pacific Herring Clupea Harengus Pallasi Valenciennes 1847 in the Strait of Georgia British Columbia written by Shawn Michael Charles Robinson and published by . This book was released on 1988 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Evaluation of Management Procedures for Pacific Herring Clupea Pallasii in the Strait of Georgia and the West Coast of Vancouver Island Management Areas of British Columbia

Download or read book Evaluation of Management Procedures for Pacific Herring Clupea Pallasii in the Strait of Georgia and the West Coast of Vancouver Island Management Areas of British Columbia written by and published by . This book was released on 2019 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Fisheries and Oceans Canada (DFO) has committed to renewing the current management framework to address a range of challenges facing Pacific Herring stocks and fisheries in British Columbia. Renewal of the management framework includes conducting a Management Strategy Evaluation (MSE) process to evaluate the performance of candidate management procedures against a range of hypotheses about uncertain stock and fishery dynamics. The purpose of the evaluation is to identify management procedures that provide acceptable outcomes related to conservation and fishery management objectives. Selection of a preferred management procedure for each DFO fisheries management area is an iterative process conducted with the participation of First Nations, the fishing industry, government and non-government organizations"--Context, pages [1]-2.