linda children is a doctoral student at the zurich university of applied sciences and her focus is fish welfare. she's seeing if carp like to eat duckweed and how well they can digest it. they're not a case of the gods of water quality and nutrition are 2 key issues for fish welfare and if they're not getting the right kind of food they can't be doing well. so. whether or not duck weed is good for a car can only be determined once they are dead. the researchers killed the specimens in a bucket with a sedative. what chickens pigs and cattle need to live decent lives has been established that's not the case with fish. hence this fish welfare project in zurich. the post mortem starts with children taking a blood sample in order to determine the concentration of cortisol. it's a hormone released in response to stress. then she removes the brain the gastrointestinal tract and the liver. skates for our month because this experiment is about duckweed as food and we also removed the liver and guts if duckweed were not good for the fish we would expect to find signs of malnutrition malnutrition