Download or read book Stock Assessments for British Columbia Herring in 1986 and Forecasts of the Potential Catch in 1987 written by D. Fournier and published by Nanaimo, B.C. : Fisheries and Oceans, Canada. This book was released on 1987 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Perspectives on Canadian Marine Fisheries Management written by Canada. Department of Fisheries and Oceans and published by NRC Research Press. This book was released on 1993 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Co-published by: National Research Council of Canada.
Download or read book Stock Assessments for British Columbia Herring in 1987 and Forecasts of the Potential Catch in 1988 written by V. Haist and published by . This book was released on 1988 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stock Assessments for British Columbia Herring in 1985 and Forecasts of the Potential Catch in 1986 written by and published by . This book was released on 1986 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The abundance of spawners in the 1985 herring run in British Columbia wateras assessed by the escapement method was 112,000 tonnes. The 1986 run isforecast at 143,000 t with average (1970-85) productivity. The 1986 forecasts for poor and good productivity are 113,400 t and 172,700 t respectively. For the south coast particularly it is anticipated that poorproductivity will prevail. The forecasts biomass of the major migratorystocks from age-structured model analysis for 1986 is 130,300 tonnes. Thispredicted run size reflects the downward stock trends in the central coastand south coast and the predictions of poor recruitment because of thecurrently unfavorable environmental conditions for these areas. The recommended 1986 catch level for the B.C. coast is 14,800 t.
Download or read book Stock Assessments for British Columbia Herring in 1984 and Forecasts of the Potential Catch in 1985 written by Vivian Haist and published by . This book was released on 1984 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stock Assessment for British Columbia Herring in 1999 and Forecasts of the Potential Catch in 2000 written by J. F. Schweigert and published by . This book was released on 1999 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stock Assessment for British Columbia Herring in 1997 and Forecasts of the Potential Catch in 1998 written by Canada. Department of Fisheries and Oceans and published by . This book was released on 1998 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 1990 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stock Assessments for British Columbia Herring in 1990 and Forecasts of the Potential Catch in 1991 written by V. Haist and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents stock assessments from an escapement model and an age-structured model developed specifically for B.C. herring. Both models reconstruct stock abundance for 1951-90 and forecast pre-spawning abundance for the 1991 season. Forecasts of recruit spawners are presented as poor, average, and good based on historically observed means.
Download or read book Stock Assessment of British Columbia Herring in 1998 and Forecasts of the Potential Catch in 1999 written by J. F. Schweigert and published by . This book was released on 1999 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stock Assessments for British Columbia Herring in 1982 and Forecasts of the Potential Catch in 1983 written by Canada. Department of Fisheries and Oceans and published by Nanaimo, B.C. : Fisheries and Oceans, Canada. This book was released on 1983 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stock Assessment for British Columbia Herring in 2002 and Forecasts of the Potential Catch in 2003 written by J. F. Schweigert and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, herring stock abundance in British Columbia waters was assessed for 2002 and forecasts were made for 2003 using two analytical methods, an age-structured model for the major stock assessment regions and an escapement model for the minor stocks. These models have been applied to assess herring abundance since 1984 and changes were introduced to account for temporal change in the spawn index. All available biological data on total harvest, spawn deposition, and age & size composition of the spawning runs were used to determine current abundance levels. Forecasts of the pre-fishery spawning stock biomass are presented for both models.
Download or read book Stock Assessment for British Columbia Herring in 1996 and Forecasts of the Potential Catch in 1997 written by and published by . This book was released on 1997 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Herring are an important component of the British Columbia commercial fishery with catch records dating from 1877. Since 1983, herring fisheries have been managed with a fixed quota system in which catch levels are determined prior to the season based on a fixed percentage of forecast stock abundance. This report presents stock assessments from escapement and age-structured analytical models that were developed explicitly for B.C. herring. Both models reconstruct stock abundance from 1951 to last year and forecast pre-spawning abundance for the coming year. Forecasts of recruit spawners are presented as poor, average and good, based on historical recruitment levels. The report does not discuss the development and evaluation of empirical models for forecasting recruitment.
Download or read book Stock Assessment for British Columbia Herring in 1995 and Forecasts of the Potential Catch in 1996 written by and published by . This book was released on 1996 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Herring are an important component of the British Columbia commercial fishery with catch records dating from 1877. Since 1983, herring fisheries have been managed with a fixed quota system in which catch levels are determined prior to the season based on a fixed percentage of forecast stock abundance. This report presents stock assessments from escapement and age-structured analytical models that were developed explicitly for B.C. herring. Both models reconstruct stock abundance from 1951 to last year and forecast pre-spawning abundance for the coming year. Forecasts of recruit spawners are presented as poor, average and good, based on historical recruitment levels. The report does not discuss the development and evaluation of empirical models for forecasting recruitment.
Download or read book Stock Assessments for British Columbia Herring in 1991 and Forecasts of the Potential Catch in 1992 written by and published by . This book was released on 1992 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Herring are an important component of the British Columbia commercial fishery with catch records dating from 1877. Since 1983, herring fisheries have been managed with a fixed quota system in which catch levels are determined prior to the season based on a fixed percentage of forecast stock abundance. This report presents stock assessments from escapement and age-structured analytical models that were developed explicitly for B.C. herring. Both models reconstruct stock abundance for 1951-91 and forecast pre-spawning abundance for 1992. Forecasts of recruit spawners are presented as poor, average and good, based on historical recruitment levels. The report does not discuss the development and evaluation of empirical models for forecasting recruitment.
Download or read book Oceanic Abstracts written by and published by . This book was released on 1995-02 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stock Assessments for British Columbia Herring in 1988 and Forecasts of the Potential Catch in 1989 written by Vivian Haist and published by . This book was released on 1989 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
