Acoustic analysis was in fact gathered from the NOAA Ship Nancy Foster during the echosounder performing during the 3 frequencies (38, 120, 200 kHz). Heart circulation length are set-to 128 ?s towards the 120 kHz and you may 200 kHz and 256 ?s towards the 38 kHz. We surveyed a total of 7 stations as well as for each channel a keen acoustic questionnaire was regular six minutes more 24 hours (pre-start, post-dawn, day, pre-dusk, post-dusk, nighttime; up to step one.5 occasions per questionnaire). The fresh new survey construction contains seven synchronous transects 1 nm (1.852 km) enough time and spread fifty yards aside (Fig step 1). The fresh watercraft rates are around 6.5 tangles. Around 7 nmi of track traces was basically interviewed for each and every off the fresh new half dozen sampling time periods (ca. 50 nmi total) at seven stations. Continue reading “A general TS-length relationships was utilized to help you guess fish size”
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