469
12 Species Case Studies
The species aggregated in huge numbers at the study site in densely packed
groups of numbers estimated at many tens of thousands possibly exceeding 50,000
fi sh. These numbers were estimated by photographing schools and counting
numbers of fi sh at a focal location, then adjusting for the density of the school
Fig. 12.26 ( a ) Large moving aggregation of Symphorichthys spilurus and ( b ) illustration of
method used to estimate fi sh numbers by using photos and a focal area ( A ). See text for details
(Photos: Jiro Sakaue)
12 Species Case Studies
The species aggregated in huge numbers at the study site in densely packed
groups of numbers estimated at many tens of thousands possibly exceeding 50,000
fi sh. These numbers were estimated by photographing schools and counting
numbers of fi sh at a focal location, then adjusting for the density of the school
Fig. 12.26 ( a ) Large moving aggregation of Symphorichthys spilurus and ( b ) illustration of
method used to estimate fi sh numbers by using photos and a focal area ( A ). See text for details
(Photos: Jiro Sakaue)