basins, and estuan'ne shores and substrates. Thermal properties of 

 estuaries are discussed, as well as the animal inhabitants of inland 

 waters and estuaries. 



Other areas discussed include: lakes, streams, solar radiation, 

 natural waters in motion, gases, dissolved solids, protists and 

 plants, and aquatic communities. (H.D.) 



Keywords: ecology, estuaries, estuarine characteristics 



IV-B-6 



McHugh, J.L. 1967. Estuarine nekton. Pages 581-620 jj^ G.H. Lauff, ed., 



Estuaries. American Association for the Advancement of Science, 



Washington, D.C. 



Estuarine nekton is discussed in general terms with sections on the 



nektonic estuary, adaptations for nektonic existence, the estuarine 



environment, distribution and abundance of estuarine nekton, food cycles 



and energy exchange, the estuarine nekton, fisheries for estuarine 

 nekton, and man and estuarine nekton. 



The author states that although the nektonic species of the Chesapeake 

 Bay and the Gulf of Mexico may have spent important parts of their lives 

 in enclosed estuarine waters, their entire biomass cannot be attributed 

 to weight added in the inshore estuary. In both regions commercial 

 fishery yields probably should be attributed to areas broader than the 

 area of the inshore estuaries, and the yield per acre should be adjusted 

 downward accordingly. 



The conclusion drawn by the author is that the standing crop or 

 annual production in numbers and biomass of nekton in any estuary 

 cannot be stated. Attempts to compute the annual production of nekton 

 in the inshore estuary will not produce realistic results, because most 

 members of the estuarine nekton move freely between the inshore and 

 the offshore estuarine environment. (B.W.) 



Keywords: estuaries, fishes, food ecology, productivity, biomass, 

 Chesapeake Bay, U.S. Gulf coast 



IV-B-7 



Sewell, G.H., and R.F. Hi 11 man. 1971. The future economic value of 

 estuarine-dependent commercial fisheries. Appendix B, pages B-1 

 through B-22 j[n The economic and social importance of estuaries, 

 Estuarine Pollution Study Series No. 2. U.S. Environmental Protection 

 Agency, U.S. Government Printing Office, Washington, D. C. 



The author states that U.S. fishermen received approximately 

 $438 million for about 4.06 billion pounds of commercial fish and 



152 



