Investigations Of Demersal Mackerel Icefish (C.Gunnari) ...

• Main Authors: Kasatkina, S.M., Frolkina, Zn.A.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: ASC 2003 - Q - Theme session 2024
• Subjects: Fisheries and aquaculture; Pressures, impacts, conservation, and management; Icefish
• Online Access: https://dx.doi.org/10.17895/ices.pub.25348795; https://ices-library.figshare.com/articles/conference_contribution/Investigations_Of_Demersal_Mackerel_Icefish_C_Gunnari_/25348795

No abstracts are to be cited without prior reference to the author.Conventionally, quantitative assessment of mackerel icefish C. gunnari, as a demersal fish species, has been made based on the results of inventory bottom trawling surveys in Subarea 48.3. The survey technique assumes that mature and large fish stay at the bottom in the daytime and may undertake vertical migrations at night, dispersing in the water column. The scientific observations made during the acoustic and bottom trawling surveys in 2000 and 2002 by the Russian vessel evidence that although the mackerel icefish occur close to the seabed the significant amounts distribute in the water column above the sampling range of the bottom trawls currently used in the standing stock estimations. This means that estimates of the standing stock based solely on bottom trawl results will be biased (underestimated) depending on the proportion of the mackerel icefish population present in the mid-water layer at the daytime. Estimates of pelagic and ...