Fish school density and volume

@article{Pitcher1979FishSD,
  title={Fish school density and volume},
  author={Tony j. Pitcher and Brian L. Partridge},
  journal={Marine Biology},
  year={1979},
  volume={54},
  pages={383-394}
}
All the fish in a school occupy a volume estimated as N·BL3, where N is the number of fish and BL is their mean body length. We present extensive data from our experiments on cruising schools of saithe (Pollachius virens), herring (Clupea harengus) and cod (Gadus morhua) to validate this formula. Two methods of calculating the volumes of schools are described. One method is aggregative and depends on measuring the envelope of free space around a schooling fish, whereas the other is based on the… 
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