repetitive behavior

longfin has wounds similar to mdm. I still cannot say for sure whether they were caused internally or externally. He shows repetitive behavior, spends most of the time on the right side of the aquarium, hovers for a while in the same place, does a little tour and returns to the location to stand still Continue reading

unpredictable interactions

view through the microscope of detritus on the ground of the fish tank (100 x) In scientific fish facilities living beings other than the model organism are usually not welcome (unless they are part of an experiment or part of the bacterial population in the filter system). They could trigger unpredictable interactions that make it Continue reading


I bought new fish food the other day. It is not as colourful as the old one and I smell a little more herbaceous notes, a little more freshness. But I am even not sure if I could distinguish both in a blind test. I will try that later. First impression: the fish spit out Continue reading


‎2. ‎Juni ‎2020, ‏‎01:06 pm [john dow] In the labs fish are fed with different food. Sometimes it is commercial fish food, sometimes they bred food for the fish. I will investigate on that. I remember a funny detail. In one source it was told that the zebra fish in the fish facility in Tübingen Continue reading

personal preferences

The observed preferences are not stable and only valid for a period of a few days. ▲ 1point prefarably loiters in the separated ‘food chamber’ mainly close to the bottom. He has this habit since about one week. ▲ For a couple of days bent also had a preference for the right side of the Continue reading


‎‎26. ‎Mai ‎2020_08:18 am The fish have not [yet?] learned about things which are translucent but solid. The medium they live in is translucent but never solid in their natural environment. They try to reach the food flakes by pelting the plexi glass. It seems that they find the passages [see image ‘alternative habitation‘] only Continue reading

neurotoxicity ?

‎26.05.20_07:53 am hook is dead. His death was not unexpected. This morning I found him on the bottom of the fish tank. As mentioned before, he was swaying. The swaying worsened the last days, and it was sad to watch him in this condition. “Motor incoordination: A general loss of normal coordination of body movements Continue reading

laboratory journal

At 26.11.19 I started a sort of laboratory journal to note observations and experiments. experiment: I filled some frozen mosquito larvae in a glass bulb and lowered it upright into the fish tank. The experiments with mosquito larvae and glass flasks were repeated until December 1, 2019. No fish entered the upright flask on the Continue reading


I wanted to train the fish to swim through a tube and started with a short piece 60 mm long, 35 mm in diameter. They showed no particular interest. Only when I charged it with mosquito larvae they passed through. Each animal faces a small number of objects within its living environment with which it Continue reading