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This file documents the distribution of Pacific herring Clupea pallasii spawn observed during aerial surveys in the Prince William Sound Area, Alaska, 1973-2021. The Prince William Sound Area (Registration Area E) is described in regulation (5 AAC 27.300) as follows: The Prince William Sound Area has as its western boundary a line extending south from Cape Fairfield, as its eastern boundary a line extending south from Cape Suckling and as its southern boundary 59 degrees N. lat. Aerial surveys are generally conducted between late March and mid-May as this brackets the majority of spring spawning events. A single observer was on most surveys prior to 2007 and subsequently two observers have been used on most surveys. Prior to 2008, all observations were marked on paper maps and summarized on paper data sheets. An ESRI ArcPad application was developed and began production use in 2008. From 2008-2021, observations were made using the ArcPad application on a tablet computer, using a bluetooth GPS to spatially locate observations. In 2021, ArcPad and computer were replaced with ESRI Field Maps on an iPad Pro using an external bluetooth Garmin GLO GPS. From 2008–2019, two observers generally split the duties as follows: one observer collected data on the ESRI Arcpad application, and the second observer collected data on paper maps and photographed spawn, herring schools; and marine mammal or sea bird observations. During 2020 and 2021, only one observer was present due to COVID-19 protocols. A few surveys were only collected on paper maps and digitized later. Photographs of spawn were used to make adjustments to length and class of spawn for most surveys.
This file documents the distribution of Pacific herring Clupea pallasii school biomass observed during aerial surveys in the Prince William Sound Area, Alaska, 1973-2021. The Prince William Sound Area (Registration Area E) is described in regulation (5 AAC 27.300) as follows: The Prince William Sound Area has as its western boundary a line extending south from Cape Fairfield, as its eastern boundary a line extending south from Cape Suckling and as its southern boundary 59 degrees N. lat. Aerial surveys are generally conducted between late March and mid-May as this brackets the majority of spring spawning events. A single observer was on most surveys prior to 2007 and subsequently two observers have been used on most surveys. Prior to 2008, all observations were marked on paper maps and summarized on paper data sheets. An ESRI ArcPad application was developed and began production use in 2008. From 2008-2021, observations were made using the ArcPad application on a tablet computer, using a bluetooth GPS to spatially locate observations. In 2021, ArcPad and computer were replaced with ESRI Field Maps on an iPad Pro using an external bluetooth Garmin GLO GPS. From 2008–2019, two observers generally split the duties as follows: one observer collected data on the ESRI Arcpad application, and the second observer collected data on paper maps and photographed spawn, herring schools; and marine mammal or sea bird observations. During 2020 and 2021, only one observer was present due to COVID-19 protocols. A few surveys were only collected on paper maps and digitized later.
This file documents counts and locations of Stellar sea lions observed during aerial surveys to document Pacific herring in the Prince William Sound Area, Alaska, 2008–2021. Additional observations prior to 2008 are on paper maps and still need to be digitized. Prince William Sound Area (Registration Area E) is described in regulation (5 AAC 27.300) as follows: The Prince William Sound Area has as its western boundary a line extending south from Cape Fairfield, as its eastern boundary a line extending south from Cape Suckling and as its southern boundary 59 degrees N. lat. Aerial surveys are generally conducted between late March and mid-May as this brackets the majority of spring Pacific herring spawning events. A single observer was on most surveys prior to 2007 and subsequently two observers have been used on most surveys. Prior to 2008, all observations were marked on paper maps and summarized on paper data sheets. An ESRI ArcPad application was developed and began production use in 2008. From 2008-2021, observations were made using the ArcPad application on a tablet computer, using a bluetooth GPS to spatially locate observations. In 2021, ArcPad and computer were replaced with ESRI Field Maps on an iPad Pro using an external bluetooth Garmin GLO GPS. From 2008–2019, two observers generally split the duties as follows: one observer collected data on the ESRI Arcpad application, and the second observer collected data on paper maps and photographed spawn, herring schools; and marine mammal or sea bird observations. During 2020 and 2021, only one observer was present due to COVID-19 protocols. A few surveys were only collected on paper maps and digitized later. Photographs of large sea lion groups were used to make adjustments to counts for some surveys.
This file documents counts of marine mammals (excluding Stellar sea lions) observed during aerial surveys to document Pacific herring in the Prince William Sound Area, Alaska, 2008–2021. Additional observations prior to 2008 are on paper maps and still need to be digitized. Prince William Sound Area (Registration Area E) is described in regulation (5 AAC 27.300) as follows: The Prince William Sound Area has as its western boundary a line extending south from Cape Fairfield, as its eastern boundary a line extending south from Cape Suckling and as its southern boundary 59 degrees N. lat. Aerial surveys are generally conducted between late March and mid-May as this brackets the majority of spring Pacific herring spawning events. A single observer was on most surveys prior to 2007 and subsequently two observers have been used on most surveys. Prior to 2008, all observations were marked on paper maps and summarized on paper data sheets. An ESRI ArcPad application was developed and began production use in 2008. From 2008-2021, observations were made using the ArcPad application on a tablet computer, using a bluetooth GPS to spatially locate observations. In 2021, ArcPad and computer were replaced with ESRI Field Maps on an iPad Pro using an external bluetooth Garmin GLO GPS. From 2008–2019, two observers generally split the duties as follows: one observer collected data on the ESRI Arcpad application, and the second observer collected data on paper maps and photographed spawn, herring schools; and marine mammal or sea bird observations. During 2020 and 2021, only one observer was present due to COVID-19 protocols. A few surveys were only collected on paper maps and digitized later. Photographs of large harbor seal groups were used to make adjustments to counts for some surveys.
This file documents counts of birds observed during aerial surveys to document Pacific herring in the Prince William Sound Area, Alaska, 2008–2021. Additional observations prior to 2008 are on paper maps and still need to be digitized. Prince William Sound Area (Registration Area E) is described in regulation (5 AAC 27.300) as follows: The Prince William Sound Area has as its western boundary a line extending south from Cape Fairfield, as its eastern boundary a line extending south from Cape Suckling and as its southern boundary 59 degrees N. lat. Aerial surveys are generally conducted between late March and mid-May as this brackets the majority of spring Pacific herring spawning events. A single observer was on most surveys prior to 2007 and subsequently two observers have been used on most surveys. Prior to 2008, all observations were marked on paper maps and summarized on paper data sheets. An ESRI ArcPad application was developed and began production use in 2008. From 2008-2021, observations were made using the ArcPad application on a tablet computer, using a bluetooth GPS to spatially locate observations. In 2021, ArcPad and computer were replaced with ESRI Field Maps on an iPad Pro using an external bluetooth Garmin GLO GPS. From 2008–2019, two observers generally split the duties as follows: one observer collected data on the ESRI Arcpad application, and the second observer collected data on paper maps and photographed spawn, herring schools; and marine mammal or sea bird observations. During 2020 and 2021, only one observer was present due to COVID-19 protocols. A few surveys were only collected on paper maps and digitized later. Photographs of bird flocks were used to make adjustments to counts for some surveys.
This file documents aerial survey routes of Pacific herring Clupea pallasii aerial surveys in the Prince William Sound Area, Alaska, 1997-2021. The Prince William Sound Area (Registration Area E) is described in regulation (5 AAC 27.300) as follows: The Prince William Sound Area has as its western boundary a line extending south from Cape Fairfield, as its eastern boundary a line extending south from Cape Suckling and as its southern boundary 59 degrees N. lat. Aerial surveys are generally conducted between late March and mid-May as this brackets the majority of spring spawning events. Generally a single observer was on surveys prior to 2006. Since 2006 two observers were on most surveys, except in 2020 and 2021. Route maps were not drawn prior to 1997. Between 1997 and 2008, survey routes were drawn on a paper map during the survey and digitized later. From 2008-2020, a bluetooth GPS with an integrated ArcPad application and a backup Garmin GPS have been used to document survey routes. In 2021, ArcPad and computer were replaced with ESRI Field Maps on an iPad Pro using external bluetooth GPS and a backup Garmin GPS. Since 2008, one observer collected data on an ESRI Arcpad application, and the second observer collected data on paper maps and photographed spawn, herring schools; and marine mammal or sea bird observations. Almost all of these aerial survey data were collected digitally at the time of observation. A few surveys since 2008 were only collected on paper maps and digitized later.