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FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



4. Hypoplanktonic species. — This group, found 

 living hovering above the bottom or temporarily 

 on the bottom in the lower littoral zone and in the 

 deeper waters of the continental shelf, are almost 

 exclusively mysids of rather wide distributional 

 range along the shore lines. As these species often 

 migrate high enough into the water above the 

 bottom to be captured by an ordinary plankton 

 net, in the absence of exact data of capture, it is 

 impossible to determine whether any of the known 

 species of the Gulf are commonly hypoplanktonic. 



A more thorough study of the mysids and 

 euphausiids of the Gulf of Mexico probably will 

 show that these rather prominent elements of 

 plankton of the open sea and of inshore waters are 

 essential food intermediates for commercially 

 important fish, as they have been found to be in 

 other regions of the world. 



BIBLIOGRAPHY 



Faxon, Walter. 



1896. 37. Supplementary notes on the Crustacea. In: 

 Reports on the results of dredging ... in the Gulf of 

 Mexico and the Caribbean Sea, and on the east coast 

 of the United States, 1877 to 1880, by the U. S. 

 Coast Survey steamer Blake . . . Bull. Mus. Comp. 

 Zool., Harvard College, 30 (3): 153-166, 2 pis. 

 Hansen, H. J. 



1915. The crustacean Euphausiacea of the United 

 States National Museum. Proc. U. S. Nat. Mus. 

 48 (2065): 59-114, 4 pis. 

 Ortmann, Arnold E. 



1906. Schizopod crustaceans in the U. S. National 

 Museum. The families Lophogastridae and Eucopii- 

 dae. Proc. U. S. Nat. Mus. 31: 23-54, 2 pis. 

 Tattersall, Walter M. 



1951. A review of the Mysidacea of the United States 

 National Museum. Bull. U. S. Nat. Mus. 201: 

 x + 292, 103 text figs. 



