Silly thoughts on why fish shoal

Above is an interesting post (with comments) by Manvi (graduate student working with my colleague Kavita Isvaran at CES) on why so many fish species shoal in comparison to terrestrial species whether it has to do with being aquatic vs terrestrial species.

Ecology Students' Society

A quarter of the known fish species shoal throughout their life, quoted a scientist working on fish shoaling behavior. I wondered how these numbers compare with terrestrial animals. Among invertebrates only  few taxa live in groups, the celebrated ones being bees, ants, wasps and termites. Agreed that many higher vertebrates especially mammals live in groups such as elephants, hyenas, primates, meercats and wolves (I am sure you can think of at least 5 more). However it seems a small proportion of terrestrial animals group compared to fish. For argument  sake, let us agree that fish group more than terrestrial animals. Here is the main point I want to make: why do fish group more than terrestrial animals? Here is a brilliant and silly idea as to why:  I think it is because in water as opposed to on land, there is a third axis to group/aggregate. This extra dimension (basically…

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