A general TS-length matchmaking was applied to imagine seafood dimensions

A general TS-length matchmaking was applied to imagine seafood dimensions

Acoustic analysis have been built-up throughout the NOAA Boat Nancy Foster for the echosounder operating in the step 3 frequencies (38, 120, 200 kHz). Heart circulation length is actually set-to 128 ?s for the 120 kHz and you will 2 hundred kHz and 256 ?s to your 38 kHz. I surveyed all in all, 7 stations as well as each channel an enthusiastic acoustic questionnaire is frequent six minutes more than a day (pre-dawn, post-start, daytime, pre-dusk, post-dusk, nighttime; approximately 1.5 era for every survey). The latest questionnaire design contained seven synchronous transects 1 nm (1.852 km) much time and you may spaced fifty meters aside (Fig step one). New motorboat speed is as much as 6.5 tangles. Around eight nmi away from track outlines was in fact surveyed for each and every away from brand new half a dozen testing schedules (california. 50 nmi complete) during the seven stations. Predator and you can sufferer densities was projected for each and every of studies therefore the diel development away from seafood density are standardized by the sampling site. قراءة المزيد