reduce environmental damage and support studies to demonstrate the benefits of 

 dredging. 



59. HALES, L.S., and CALDER, D.R,, "A Study of Fish and Shellfish Migration 

 Across the Weir of Weir-Jetty, Murrells Inlet, South Carolina," Summary 

 Report, Marine Resources Research Institute, South Carolina Wildlife and 

 Marine Resources Department, Charleston, S.C., 1979, 



The weir jetty system currently under construction at Murrells Inlet, 

 South Carolina, embodies a unique new concept in the design of such structures 

 and is one of several comparable jetty projects planned as navigational improve- 

 ments in other coastal areas of the United States, One of the major environ- 

 mental concerns in the construction of a jetty is its influence on the movement 

 of aquatic species to and from estuarine nursery grounds. Jetties may have a 

 significant impact on the migration of fishes and motile invertebrates, such 

 as crabs and shrimp, into estuaries thereby affecting the commercial and 

 recreational fisheries of an area. Because the weir section is underwater dur- 

 ing a part of the tidal cycle, this jetty design conceivably presents less of 

 a barrier to nektonic and planktonic species entering and leaving an inlet than 

 a typical nonweir jetty. This report describes a study designed to monitor the 

 movement of planktonic and nektonic species across a weir during periods of 

 high tide. 



60. HANSEN, D.R., and MUNCY, R.J., "Effects of Stream Channelization on Fishes 

 and Bottom Fauna in the Little Sioux River, Iowa," Project No. A-035-IA, 

 Iowa State Water Resources Research, Iowa State University, Ames, Iowa, 

 June 1971. 



Differences in certain physical factors, bottom fauna, and fish popula- 

 tions were evaluated in channelized and unchannelized parts of the Little 

 Sioux River, Iowa, during 1969-71. 



Composition of bottom fauna was similar in the two sections. Coloniza- 

 tion of macroinvertebrates on artificial substrates suggested a lack of suit- 

 able attachment areas in the channelized section. The higher numbers of drift 

 organisms in the channelized section were further evidence of this; the numbers 

 of fish species were greater in the unchannelized section. 



Unbaited hoopnet catches in the unchannelized section revealed the presence 

 of more large channel catfish, the most important game species, than in the 

 channelized section. Hoopnet catches and primacord explosive samples collected 

 greater numbers of smaller channel catfish (less than 254 millimeters) in the 

 channelized section during late summer and early fall. Because of a possible 

 downstream movement from the unchannelized section into the channelized section, 

 suggested by movement studies and similar growth rates, drastic differences in 

 standing crops of fish were not measurable in comparisons of the two areas. 



61. HARPER, D.E., "Effects of Siltation and Turbidity on the Benthos and 

 Nektons," Envivormental Irrrpaot Assessment of Shell Dredging in San Antonio 

 Bai/j Texas, Vol. V, App. D5, Texas A & M Research Foundation, Sept. 1973, 

 pp. 114-123. 



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