NATURAL LIMITS.
BIOLOGIST ON TROUT,
The utility of liberating trout fry, as is widely practised by acclimatisation societies' throughout New Zealand, to maintain the stocks of fish in the streams, is questioned by ,Mr. Derisley F. Hobbs. fresh water biologist .at the Fisheries Laboratory, Wellington, in a bulletin issued by the Fisheries Branch of the Marine Department. The bulletin is a study of the natural reproduction of trout, and its relation to the density of trout populations, in New Zealand water. In it Mr. Hobbs says that trout populations are limited by natural causes, and that it is vain to endeavour to increase them above those limits by liberations. As a result of extensive researches in streams of Otago and Auckland Provinces, Mr. Hobbs ascertained that trout populations appeared to be generally limited by the extent of the spawning grounds available. "The wisdom may well be doubted of attempting artificially to aid the natural increase of populations (be they of deer, oysters or trout) by releases into areas where a natural ability to increase is already being frustrated by environmental limitation/' Mr. Hobbs concludes.
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Auckland Star, Volume LXXI, Issue LXXI, 14 September 1940, Page 11
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184NATURAL LIMITS. Auckland Star, Volume LXXI, Issue LXXI, 14 September 1940, Page 11
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