2020
DOI: 10.1093/icesjms/fsaa101
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Industry-collected target strength of high seas orange roughy in the Indian Ocean

Abstract: Visually verified in situ target strengths (TS) are the state of the science for determining the conversion from acoustic echo-integration surveys to biomass. Here, we show how these measurements can be made by high seas fisheries during normal operations using a net-attached acoustic optical system (AOS) without specialized personnel on board. In situ TS were collected from ∼45 cm standard length (SL) orange roughy (Hoplostethus atlanticus) in the southern Indian Ocean at 38 and 120 kHz. We use a multiple lin… Show more

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Cited by 3 publications
(1 citation statement)
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“…Instead, the TS ‐ L equation for C. auratus was based on ex situ measurements of larger individuals in Cockburn Sound, WA. This may not be appropriate as TS measurements made on different size‐classes of the same species can result in very different TS ‐ L equations (Scoulding & Kloser, 2021), and, therefore, differences in biomass estimates. There were no published TS‐L equations available for some of the other aggregating fish species, introducing an unknown but systematic error to their biomass estimates.…”
Section: Discussionmentioning
confidence: 99%
“…Instead, the TS ‐ L equation for C. auratus was based on ex situ measurements of larger individuals in Cockburn Sound, WA. This may not be appropriate as TS measurements made on different size‐classes of the same species can result in very different TS ‐ L equations (Scoulding & Kloser, 2021), and, therefore, differences in biomass estimates. There were no published TS‐L equations available for some of the other aggregating fish species, introducing an unknown but systematic error to their biomass estimates.…”
Section: Discussionmentioning
confidence: 99%