The work of the New Zealand Fresh Water Research Committee includes investigation of the rate of growth of brown and rainbow trout, movements of the fish in various streams, the effects of temperature variation, and other problems. The first picture shows Professor E. Percival (director of research), Mr A. W. Parratt (biologist), and their assistants examining fish in the Selwyn River. The fish are trapped by means of a wire netting weir. Each fish is weighed, measured, tagged, and has scale samples taken before being returned to the stream. In the second is a trout with ari identification tag fastened to its tail. Green and Hahn, photo.
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Otago Witness, Issue 4032, 23 June 1931, Page 39
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107The work of the New Zealand Fresh Water Research Committee includes investigation of the rate of growth of brown and rainbow trout, movements of the fish in various streams, the effects of temperature variation, and other problems. The first picture shows Professor E. Percival (director of research), Mr A. W. Parratt (biologist), and their assistants examining fish in the Selwyn River. The fish are trapped by means of a wire netting weir. Each fish is weighed, measured, tagged, and has scale samples taken before being returned to the stream. In the second is a trout with ari identification tag fastened to its tail. Green and Hahn, photo. Otago Witness, Issue 4032, 23 June 1931, Page 39
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