The cruise will consist of continuous underway measurements and CTD/net tow stations from north to south along approximately 16 transit lines and the Columbia River and San Francisco Bay Estuaries from 6/13-7/27/2021.

<unknown>

<unknown>

Multi-frequency (18-, 38-, 70-, 120-, 200-, and 333-kHz) General Purpose Transceivers (Simrad EK60 GPTs), were configured with split-beam transducers (Simrad ES18-11, ES38B, ES70-7C, ES120-7C, ES200-7C, and ES333-7C, respectively). The transducers were mounted on the bottom of a retractable keel or &#8220;centerboard&#8221;. The keel was retracted (~ 5-m depth) during calibration, and extended to the intermediate position (~7-m depth) during the survey.

Multi-frequency (18-, 38-, 70-, 120-, 200-, and 333-kHz) General Purpose Transceivers (Simrad EK60 GPTs), were configured with split-beam transducers (Simrad ES18-11, ES38B, ES70-7C, ES120-7C, ES200-7C, and ES333-7C, respectively). The transducers were mounted on the bottom of a retractable keel or &#8220;centerboard&#8221;. The keel was retracted (~ 5-m depth) during calibration, and extended to the intermediate position (~7-m depth) during the survey.

Multi-frequency (18-, 38-, 70-, 120-, 200-, and 333-kHz) General Purpose Transceivers (Simrad EK60 GPTs), were configured with split-beam transducers (Simrad ES18-11, ES38B, ES70-7C, ES120-7C, ES200-7C, and ES333-7C, respectively). The transducers were mounted on the bottom of a retractable keel or &#8220;centerboard&#8221;. The keel was retracted (~ 5-m depth) during calibration, and extended to the intermediate position (~7-m depth) during the survey.

Coastal pelagic fish species (CPS), krill, and their environment within the California Current Ecosystem (CCE) were sampled using multi-frequency echosounders, surface trawls, vertically integrating net tows, a continuous underway fish-egg sampler (CUFES), and conductivity-temperature-depth probes (CTD), and assessed using the Acoustic-Trawl Method (ATM) and Daily Egg Production Method (DEPM) during the Spring CPS Survey aboard the NOAA Fisheries Survey Vessel (FSV) Reuben Lasker (hereafter, Lasker), 21 March to 22 April 2017.

Coastal pelagic fish species (CPS), krill, and their environment within the California Current Ecosystem (CCE) were sampled using multi-frequency echosounders, surface trawls, vertically integrating net tows, a continuous underway fish-egg sampler (CUFES), and conductivity-temperature-depth probes (CTD), and assessed using the Acoustic-Trawl Method (ATM) and Daily Egg Production Method (DEPM) during the Spring CPS Survey aboard the NOAA Fisheries Survey Vessel (FSV) Reuben Lasker (hereafter, Lasker), 21 March to 22 April 2017.

The sampling resolution was not expected to allow for a comprehensive assessment of all anchovy sub-populations. In particular, those residing in the Southern California Bight and off the Columbia River plume would likely require additional effort given their patchy distribution. The modeled distribution of potential sardine habitat, and information recently gathered from other research projects (e.g., CalCOFI samples) or the fishing industry (e.g., sardine bycatch) were used to determine whether the survey domain also encompassed the northern sub-population of sardine.

The sampling resolution was not expected to allow for a comprehensive assessment of all anchovy sub-populations. In particular, those residing in the Southern California Bight and off the Columbia River plume would likely require additional effort given their patchy distribution. The modeled distribution of potential sardine habitat, and information recently gathered from other research projects (e.g., CalCOFI samples) or the fishing industry (e.g., sardine bycatch) were used to determine whether the survey domain also encompassed the northern sub-population of sardine.