Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Random patterns in fish schooling enhance alertness: a hydrodynamic
  perspective   One of the most highly debated questions in the field of animal swarming and
social behaviour, is the collective random patterns and chaotic behaviour
formed by some animal species, in particular if there is a danger. Is such a
behaviour beneficial or unfavourable for survival? Here we report on one of the
most remarkable forms of animal swarming and social behaviour - fish schooling
- from a hydrodynamic point of view. We found that some fish species do not
have preferred orientation and they swarm in a random pattern mode, despite the
excess of energy consumed. Our analyses, which includes calculations of the
hydrodynamic forces between slender bodies, show that such a behaviour enhances
the transfer of hydrodynamic information, and thus enhances the survivability
of the school. These findings support the general hypothesis that a disordered
and non-trivial collective behaviour of individuals within a nonlinear
dynamical system is essential for optimising transfer of information - an
optimisation that might be crucial for survival.

25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an