Tilt angles of schooling penned saithe
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Original versionThis report is not to be cited without prior reference to the authors
Saithe (Pollachius virens) of nearly uniform 32 cm length have been photographically observed during the daytime in an apparently free-swimming and schooling state in a pen of dimensions 90 m length, 10 m width, and 7 m depth. The resulting tilt angle distribution is essentially normal, with mean -0.9 deg and standard deviation 5.4 deg.