Muelbert, Jose H; de Macedo-Soares, Luis Carlos Pinto; Favareto, L R; Costa, M D P (2018): Ichthyoplankton composition form PRONEX cruise 2, Southern Brazilian Shelf, in 2007 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.890732,

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In: Muelbert, JH et al. (2018): Ichthyoplankton surveys in the southern Brazilian region from 1970 to 2010 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.884342

The PRONEX series was obtained during two interdisciplinary cruises carried out in the scope of the "Programa de Apoio a Núcleos de Excelência" carried out in the winter of 2005 and summer 2007, in the regions near the Cape of Santa Marta (28º30'S) and Albardão (33ºS). Three transects were performed with the research vessel Atlantico Sul, totaling 15 oceanographic stations spaced 14 nautical miles (~ 26 km) apart in the Cape of Santa Marta, and 18 stations distant 17 nautical miles (~ 31 km) apart in the Albardão (Torquato, 2013). Ichthyoplankton samples were obtained continuously during the day and night by means of stratified hauls with a MultiNet containing 3 nets of 330 μm of mesh opening (nets 1, 3 and 5) and 2 nets of 200 μm (2 and 4), and mouth area of ​​0.25 m2. Two flowmeters, one internal and one external, were fixed in the MultiNet structure to measure filtration efficiency of the tow, and determination of the volume filtered in each haul with the internal flowmeter (Torquato, 2013). The MultiNet was lowered to the maximum depth of sampling with the first 330 μm net performing an oblique trawl. Subsequently, the MultiNet was towed back to the surface conducting stratified horizontal hauls at four different depth intervals. Ichthyoplankton was selected from the samples collected with the 330 μm nets (Torquato & Muelbert, 2014, 2015). The depth of each stratified horizontal trawl took into account the thermal and acoustic profile sampled at each station, so the depth of sampling varied between the oceanographic stations (Torquato, 2013). The samples were preserved in formaldehyde solution, buffered with sodium tetraborate, diluted in sea water with a final approximate concentration of 4%. The filtered volume was calculated and used to standardize the abundance of fish eggs and larvae per 100 m3 of filtered water (Torquato & Muelbert, 2014, 2015).