Figure 6.

Illustration of the three most probable swimming patterns for a three fish group of H. bleheri. Distances and angles between neighbours are kept constant. (a) Two aligned fish are leading the pattern on the sides and the middle fish lies in the back. (b) One fish is leading the pattern on the side, the two other fish are shifted respectively from the other. (c) One fish is leading in the middle of the pattern, two aligned fish follow in the back. (d) Occasionally observed schooling pattern evoking the diamond-like arrangement described in [6], two aligned fish are leading the pattern on the sides. This time the third fish is evolving in the wakes of the two firsts, changing the global organization of the swimming pattern.