FRESH-WATER CRUSTACEA AS FOOD FOR YOUNG FISHES/ 



By William Convebse Kendall, Scientific Assistant, U. 8. Bureau of Fisheries. 



CONTENTS. 



Introduction 3 



Crustacea 4 



Entomostraca 4 



Phyllopoda or fairy shrimps 5 



Cladocera or water fleas 5 



Copepoda 7 



Ostracoda 7 



Malacostraca 9 



Isopoda 9 



Amphipoda or scuds 9 



Gamniarus fasciatus 10 



Gammarus limnseus 11 



Hyalella knickerbockeri 11 



Eucrangonyx gracilis 12 



Mysidacea 13 



Decapoda 14 



Prawn 14 



Crayfishes 14 



Possibility of successful crustacean culture 15 



Entomostraca 16 



Phyllopoda 16 



Cladocera 16 



Copepoda 18 



Ostracoda 18 



Malacostraca 19 



Isopoda 19 



Amphipoda 19 



Mysidacea 23 



Decapoda 23 



Prawn 23 



Crayfishes 23 



Possibility of stocking streams and lakes 23 



Methods of obtaining stock of crustaceans 24 



Value of crustaceans as fish food 25 



Synopsis and discussion .' 26 



Bibliography 30 



INTRODUCTION. 



vSome years ago a number of species of small crustaceans were 

 recommended as natural food for artificially raised young fishes, par- 

 ticularly salmon and trout. The claim was made that the ease with 

 which certain species of these little animals could be kept and bred 

 made them particularly valuable for fish-cultural purposes; but it 

 was also suggested that natural streams and ponds deficient in food 

 could be stocked with this kind of natural food, since some species 



1 Appendix I to the Report of the U. S. Commissioner of Fisheries for 1922. B. F. 

 Doc. 914. 



3 



