Ichthyoplankton composition from SUESTE cruise 4, Southern Brazilian Shelf, in 1985@en

The Departamento de Hidrografia e Navegação (DHN) from the Brazilian Navy in partnership with the Centro de Biologia Marinha (CEM) of the Federal University of Paraná (UFPR) conducted four seasonal cruises covering the coastal, neritic and oceanic regions between 24º06'S and 29º36'S to evaluate the general oceanographic processes present in the region (Brandini, 1990a; 1990b). Each cruise had twelve transects perpendicular to the coastline that were surveyed onboard NOc. Almirante Saldanha resulting in approximately 90 oceanographic stations spaced 30 nautical miles (~ 55 km) apart (Brandini, 1990b). Samples were obtained in the shallow stations (depth <50 m) through horizontal and vertical trawls with a 0.5 m mouth diameter, 250 μm mesh plankton net. Oblique hauls using 0.6 m mouth diameter, 300 μm mesh plankton net were conducted mainly at intermediate depths (> 50 m and <200 m) from 5 m from the bottom to the surface, and from 200 m depth in the deep stations. At selected intermediate and deep stations, stratified vertical hauls with a 0.5 m mouth diameter, 250 μm mesh plankton net were also performed. The net type used has not been determined, except for the use of a Chossi Kid Net in some stations of the 2nd cruise. Volume of filtered water for each trawl is not available and number of eggs and larvae were not standardized (Macedo-Soares, 2015).巴西海军水文与航海部（Departamento de Hidrografia e Navegação, DHN）与巴拉那联邦大学（Federal University of Paraná, UFPR）下属的海洋生物学中心（Centro de Biologia Marinha, CEM）合作开展了四次季节性科考航次，覆盖南纬24°06′至29°36′区间内的沿岸、浅海与远洋海域，旨在评估该区域的综合海洋学过程（Brandini, 1990a; 1990b）。每次航次均设置12条垂直于海岸线的调查断面，由“阿尔米兰特·萨尔达尼亚号”科考船（NOc Almirante Saldanha）完成作业，共布设约90个海洋学站位，站位间距为30海里（约55千米）（Brandini, 1990b）。在浅水区站位（水深＜50米），研究人员使用口径0.5米、网目尺寸250μm的浮游生物网（plankton net）开展水平与垂直拖网采样。针对中等水深区域（＞50米且＜200米）及深海站位（水深≥200米），主要采用口径0.6米、网目尺寸300μm的浮游生物网进行斜向拖网，拖网范围从距海底5米处延伸至表层；在部分选定的中等与深海站位，还使用口径0.5米、网目尺寸250μm的浮游生物网开展了分层垂直拖网作业。除第二次航次的部分站位使用了乔西·基德网（Chossi Kid Net）外，其余航次所使用的网具类型均未明确说明。各次拖网的过滤水体体积数据均未留存，卵与幼体的计数也未进行标准化处理（Macedo-Soares, 2015）。