00000nam 2200000za 4500 9.805893 CaOODSP 20221107135748 cr ||||||||||| 150406s2000 oncdb ob f000 0 eng d CaOODSP eng eng fre n-cn--- Fs70-1/2000-066E-PDF Summary of 1999 herring acoustic surveys in NAFO divisions 4WX [electronic resource] / G.D. Melvin … [et al.]. Ottawa : Fisheries and Oceans Canada, 2000. 40 p. : fig., graphs, maps, tables. Canadian Stock Assessment Secretariat research document, 1480-4883 ; 2000/066 Includes bibliographical references (p. 16-17). The distribution and abundance of Atlantic herring in NAFO Divisions 4WX was documented and estimated from data collected by automated acoustic logging systems deployed on five purse seiners and research surveys. As in previous years, the data originated from fishing operations and structured surveys. The number of recording nights from both fishing excursions and structured surveys increased from 1998 to 1999. Adherence to the survey design for structured surveys proposed for the 1999 fishing season was mixed. Approximately 50% of the structured surveys were considered to have met the criteria for a successful/completed survey. Although survey coverage of the main spawning grounds improved, the coverage was not considered adequate for inter-year comparisons. The total biomass for each of the main spawning components was estimated by summing the results of surveys separated by more than 10 days during the spawning season. In 1999, the observed biomass was based almost exclusively on data collected during structured surveys. Biomass estimates for Scots Bay, Trinity Ledge and German Bank were 41,000 t, 3,900 t, and 460,800 t. For the stock complex, the minimum SSB's do not directly reflect trends in stock abundance, the decline in observed biomass in Scots Bay and on Trinity Ledge is cause for some concern, given the extent/increase of survey coverage. gccst Fisheries resources gccst Salt water fish gccst Fishing area gccst Fisheries management Melvin, Gary Donald, 1951- Canada. Department of Fisheries and Oceans. Canada. Canadian Stock Assessment Secretariat. Canadian Stock Assessment Secretariat research document, 1480-4883 ; 2000/066 (CaOODSP)9.507740 PDF 742 KB https://publications.gc.ca/collections/collection_2015/mpo-dfo/Fs70-1-2000-066-eng.pdf