294 



tr. S. BUREAr OF FISHERIES 



The sea horses, usually to be found at the aquarium, can be kept 

 to good advantage only when they are well supplied with Gammarus. 

 In Avinter it is often difficult to supply sea horses w^ith a sufficient 

 amount of this food. The aquarium in Philadelphia uses Daphnia 

 and fro'^h-water Gammarus. obtained in the waters of Fairinount 



Fi(i. c)2. — Sea horses in the New York Aquariuiu 



Park, as food for sea horses and many of the tropical fresh-water 

 fishes kept in small aquaria. 



Young trout and salmon in the fish hatchery are fed successfully 

 on minced liver and beef heart, the latter giving the best results, 

 as there is less fouling of the water. A small amount of fresh fish 

 can be ground with it. They are also fond of herring roe, Avhich has 



