shrimp are found naturally in very large numbers and make excellent 

 trout food. 



Mr. Titcomb : What is the prawn to which reference is made? 



Db. G. 0. Embody, Ithaca, N. Y. : It is also called the river shrimp 

 and grows to various sizes. Those found in the Mississippi Valley are from 

 one to one and a half inches long ; they belong to two genera, Palaemon 

 and Palaemonetes, and are warm water forms. There are many different 

 species of Gammarid shrimps. Some of them may live in lime water, or 

 require lime water ; others do not require it. I doubt very much if you can 

 find a clean permanent pool anywhere in the United States that does not 

 contain some kind of shrimp. They are that generally distributed. The one 

 at Caledonia, Gammarus limnceus, is probably the largest, and the next in 

 size is the G. fasciatus. It is very closely related to the Caledonia shrimp, 

 but seems to prefer warmer water. It occurs along the marshes of Cayuga 

 Lake, not only in the vegetation, but among the rocks. The Hyalella 

 shrimps are probably not more than one-fifth as long as the Caledonia 

 shrimp, but they occur all over. 



Mb. Titcomb: Dr. Embody, have you found this common form of 

 shrimp in suflBcient abundance anywhere to think of them as possible for 

 trout food, as we do the Caledonia shrimp? 



Dr. Embody: In suitable environment the Hyalellas are fully as abun- 

 dant as are the large shrimp at Caledonia. They are much smaller, how- 

 ever, and easily escape notice. Wliile they occur in both cold and warm 

 water, they seem to multiply much more rapidly in warm water containing 

 dense vegetation. The Hyalellas escape foraging fishes much more success- 

 fully than the larger shrimps and thus would probably hold their own 

 much better in large natural rearing ponds such as are used for bass. 

 The lai-ger shrimps would probably be exterminated before they could 

 become established. In protected inclosures not stocked with fish, how- 

 ever, I believe that a greater amount of fish food could be produced by 

 using the larger forms. These might be collected and fed to the fish or 

 the fish might be turned into forage. 



Mb. Titcomb: This talk about the shrimp as a food has been up for 

 a great many years, and the anglers' clubs have been encouraged to stock 

 streams with shrimp to increase the food for fish. It has been a very 

 general recommendation in the past. It is my opinion that in possibly 

 nine cases out of ten the introduction of shrimp does not amount to any- 

 thing. A great many of our streams; after being stocked, show no evidence 

 of shrimp, — that is the large Caledonia shrimp. As Dr. Embody says, 

 you will always find the small shrimp in limited numbers under the rocks 

 or in the vegetation. I do not think that the introduction of the smaller 

 shrimp in trout streams amounts to much, but there are spring-fed streams, 

 especially in limestone formations, where the shrimp can be introduced to 

 good advantage. 



Dr. Embody: I think that is true. The great difficulty of introducing 

 those shrimp in many places, we found, was that the fish would extermi- 

 nate in a short time the small numbers which could be introduced. It is 

 a different matter to propagate them for fish food in protected places. 



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