Multidisciplinary acoustic surveys with focus on fishes and plankton: how understanding species interaction can support fish stock assessment and management activity ...

• Main Authors: Kasatkina, Svetlana, Gasyukov, Pavel
• Format: Conference Object
• Language: unknown
• Published: ASC 2014 - Theme session L 2023
• Subjects: Technologies and data; Ecosystem observation, processes and dynamics; Antarctic; Antarc*; Icefish
• Online Access: https://dx.doi.org/10.17895/ices.pub.24752688; https://ices-library.figshare.com/articles/conference_contribution/Multidisciplinary_acoustic_surveys_with_focus_on_fishes_and_plankton_how_understanding_species_interaction_can_support_fish_stock_assessment_and_management_activity/24752688

No abstracts are to be cited without prior reference to the author. It was shown that uncertainty in semipelagic species assessments is to the great extent determined by existing biomass distributed in the pelagic zone and becomes unavailable to the bottom survey being traditional method for estimating such species. The authors provided multidisciplinary acoustic survey (in the pelagic layer above the near-bottom layer covered by the bottom trawl) and supplemented bottom surveys with acoustic observations to investigate drivers of spatial distribution of semipelagic mackerel icefish (Ch.gunnary) and increase reliability of survey estimates for this commercial fish in Antarctic water. It was revealed that the significant amounts of icefish (in some years nearly 50-60%) may distribute in the pelagic zone being unavailable to bottom survey. Variability of icefish spatial distribution in the near-bottom layers revealed that bottom survey indices are often of random nature and depend on the location of trawl ...