Acoustic research were built-up from the NOAA Motorboat Nancy Promote from inside the echosounder functioning from the 3 frequencies (38, 120, 2 hundred kHz). Heart circulation duration try set-to 128 ?s with the 120 kHz and you may 2 hundred kHz and you can 256 ?s into 38 kHz. I interviewed a maximum of eight programs and at for each and every route an enthusiastic acoustic questionnaire is repeated 6 minutes over 24 hours (pre-dawn, post-dawn, daytime, pre-dusk, post-dusk, nighttime; as much as step one.5 days for each questionnaire). The new questionnaire design consisted of 7 parallel transects 1 nm (step 1.852 kilometer) enough time and spaced 50 m aside (Fig step one). The latest vessel speed are as much as six.5 knots. Just as much as seven nmi of tune traces have been surveyed for each out-of new half dozen testing cycles (california. fifty nmi complete) on 7 programs. Predator and you will sufferer densities had been estimated for each and every of your own surveys together with diel pattern from fish thickness is actually standardized from the sampling site. Continue reading “A generalized TS-size dating was used to guess seafood size”
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