Method development for fisheries data collection

Within the framework of this project, the Institute of Freshwater Ecology and Fisheries Management, in cooperation with the Austrian Federal Forestry Company (Österreichische Bundesforste-AG), studied the whitefish and Arctic char stocks of 10 Austrian lakes.

The graph, created with Excel, shows with 9 coloured lines the growth of whitefish in Austrian lakes from birth to age 8. On the left from bottom to top from zero to 50 in steps of five the total lengths (lengths of the fish) in centimetres, on the bottom from left to right from zero to eight by age in years. Many lines start between 10 and 16 centimetres of total length and end between 28 and 40 centimetres. One line ends at 5 years, another at 6 years, three lines at 7 years and the remaining
© Graphic: Fish and Waters

The aim of this study was to adapt and optimize the sampling methodology to the target species of whitefish and Arctic char, to use a new scientific echo sounder (Simrad EK 80, multi-beam) to estimate fish biomass and fish density, and ultimately to analyze the collected data sets from a fisheries management perspective and derive recommendations for the management of whitefish and Arctic char stocks. The surveys took place in 2018 and 2019.

The graph shows the growth of whitefish aged between 0 and 8 years in 9 Austrian lakes with 9 coloured lines.

The Excel chart shows the growth of Arctic charr in Austrian lakes from birth to 10 years of age with 7 coloured lines. On the left from bottom to top from zero to 45 in steps of five the total lengths in centimetres, on the bottom from left to right from zero to ten by age in years. Three lines start between 4 and 7 centimetres in length, two lines start between 12 and 15 centimetres in length, with three lines ending at 8 years, the others continuing to 10 years. The different colours correspond to different lakes in Austria.
© Graphic: Fish and Waters

The graph shows the growth of Arctic charr aged between 0 and 10 years in Austrian lakes with 7 coloured lines.

Downloads