REPORT OF THE COMMISSIONER OF FISHERIES, 1923. 



CONTENTS. 



Page. 



Fishery industries services 2 



Review 2 



Fisli mercliandising 3 



Technological investigations 4 



Brine-freezing of fish 4 



Preservation of nets 5 



Canning sardines 5 



Salting of Pacific coast mackerel 6 



Pearl essence G 



Participation in the Brazilian International Centennial Exposition — 7 



Canned fishery products and hy-products 7 



Frozen-fish trade 9 



New England vessel fisheries 9 



Vessel fisheries at Seattle, Wash 12 



Fisheries of California .' 12 



Fisheries of New York. New Jei'sey, Pennsylvania, and Delaware 13 



Shad fishery of the Hudson River 14 



Florida sponge fishery 14 



Inquiry respecting food fishes and fishing grounds 15 



Introduction 15 



Studies of fishes 16 



Oyster investigations 19 



Investigations relating to fish culture 19 



Fresh-water mussels . 20 



Mosquito control 21 



Fouling of vessel bottoms \ 22 



Miscellaneous investigations in interior waters 22 



Operation of biological laboratories 23 



Pollution of waters 23 



Propagation and distribution of food fishes 24 



Review ^ 24 



Distribution of output of hatcheries 27 



Relations with States in fish culture 28 



Cooperation with fish-protective associations 30 



Propagation of migratory fishes of Atlantic rivers 30 



Propagation of commercial species of the Great Lakes 31 



Propagation of Pacific salmons 32 



Cultivation of fishes of interior waters 34 



Alaska fislieries service 37 



Extent of the Ala.ska fisheries 37 



Enforcement of fishery laws and regulations 38 



Private salmon hatcheries 38 



New salmon-fishery regulations 39 



Special studies and investigations ^ 40 



I'rotection of walrus and sea lions 41 



New legislation needed 41 



Alaska Legislature 42 



1 



