Krill along the 110°E meridian: Oceanographic influences on assemblages in the eastern Indian Ocean, RV Investigator voyage IN2019_V03 (2019)

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A multidisciplinary voyage aboard the R.V. Investigator voyage IN2019_V03 as part of the Second International Indian Ocean Expedition examined the physical, biogeochemical and biological properties of the 110 E line between 17 May and 6 June 2019. A total of 20 stations were sampled for zooplankton along the 110◦E line over which the depth of the seafloor was generally between 4000 and 6000 m. Sampling started in temperate waters at 39.5◦S (Station 1) and ended in tropical waters at 11.5 S (Station 20), with stations spaced ~1.5 deg apart.

An Indian Ocean Standard Net (area of 1 m2, net diameter of 113 cm and mesh size of 335 μm; Hydro-Bios), originally designed for the first IIOE (Currie, 1963), was used to collect zooplankton samples. The net which was fitted with a heavy cod end frame filled with lead was rapidly lowered over the side of the stationary ship to a depth of 200 m and then vertically hauled through the water column at a speed of about 0.5 m per sec. The volume of water filtered per sample was approximately 200 m3; a flowmeter was not used. Zooplankton samples were preserved in 10% buffered formalin in seawater for later laboratory analyses.

Data accessed from cited article on 2022-06-15. Voyage details (metadata, projects, other datasets either online or as downloads, publications and reports, events, maps etc) can be accessed at https://www.marine.csiro.au/data/trawler/survey_details.cfm?survey=IN2019_V03 If this data has been used in any products, please acknowledge with the following: We acknowledge the use of the CSIRO Marine National Facility (https://ror.org/01mae9353) in undertaking this research.

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