Fish Ecological Monitoring Activity Report 2020

Following the completion of the field work and initial evaluation in 2020, an activity report will be submitted to present the interim results of the 2020 fishing activities on the edge of the reed belt at observed feeding sites of piscivor birds. Due to the low water level, the 2020 study programme had to be moved to areas that could still be navigated by motorboat for shore strip fishing. Large parts of the inner reed belt were separated and could no longer be reached on the sea side. The surveys included electrofishing in four selected areas of the reed belt: Illmitzer Bay with nearby canals and three areas in the core zone of the National Park, the so-called Silbersee. At the four sites, after consultation with ornithologists, various fish-eating bird species, in particular herons (grey and silver heron, cormorant and dwarf scarves) were observed during hunting. In 2020, the surveys of fish density and fish biomass along the reed edges in these areas were also carried out by means of electrofishing from the boat.2020年野外作业与初步评估完成后，本报告将呈现2020年在食鱼鸟类（piscivor birds）观测觅食位点周边芦苇带开展的捕捞活动的中期成果。受水位偏低影响，2020年的研究计划不得不调整至仍可通行摩托艇的区域开展岸带捕捞作业。大片内陆芦苇带已与近海侧隔绝，无法再通过海路抵达。本次调查在四处选定的芦苇带区域开展电捕鱼法（electrofishing）作业：伊尔米茨湾（Illmitzer Bay）及其周边运河，以及国家公园（National Park）核心区的三处区域，即所谓的银湖（Silbersee）。在上述四处位点，经与鸟类学家（ornithologists）磋商后，观测到多种食鱼鸟类在此处捕猎，其中尤以鹭类（灰鹭、银鹭）、鸬鹚与矮鸬鹚（dwarf scarves）为典型。2020年，研究团队还通过搭载于摩托艇的电捕鱼法，对上述区域芦苇带沿岸的鱼类密度与鱼类生物量开展了调查。