containing 0.25 ng per liter DDT but 

 survived only a few days at a concentration 

 in excess of 0.5. 



Lubitz, Joseph A., Carl R. Fellers, and Raymond 

 T. Parkhurst. 



1943. Crab meal in poultry rations. Part 1. 

 Nutritive properties. Poultry Science, vol. 22, 

 No. 4, p. 307-313. 



Blue crab meal from dried cannery waste 

 was analyzed chemically and assayed, using 

 rats and chickens, for vitamin content. 



Ludwig, P. D., H. J. Dishburger, J. C. McNeill, 

 IV, W. D. Miller, and J. R. Rice. 



1968. Biological effects and persistence of 

 Dursban insecticide in a salt-marsh habitat. 

 Journal of Economic Entomology, vol. 61, 

 No. 3, p. 626-633. 



Application of 0.025 pound per acre had 

 no obvious adverse effects on natural and 

 caged crabs, shrimp, fish, and birds. A level 

 of 0.05 pound per acre resulted in deaths 

 of brown shrimp and some small fish, but 

 larger fish and blue crabs appeared to be 

 unharmed, even when confined in the 

 treated area for 21 days. Also studied the 

 persistence of Dursban in water, silt, and 

 oysters after application. 



Ludwig, Paul D., J. C. McNeill, and W. D. Miller. 

 1967. Preliminary results obtained with Durs- 

 ban in the biotic community. Down to Earth, 

 vol. 22, No. 4, p. 3-5. 



Dursban insecticide, applied to areas of salt 

 marshland in Texas for mosquito control, 

 did not affect mullet and blue crabs con- 

 fined 21 days to the treated areas. 



Ludwigson, John O. 



1969. Chesapeake Bay. Oceans, vol. 1, No. 5, 

 p. 6-16. 



Points out that the relation between the 

 number of spawning blue crabs and the sub- 

 sequent population levels was almost inverse, 

 and thus the number of spawners does not 

 explain great annual fluctuations in abun- 

 dance of marketable crabs. 



Lunz, G. Robert. 



1947. Callinectes versus Ostrea. Journal of the 

 Elisha Mitchell Scientific Society, vol. 63, No. 

 l.p.81. 



Serious predator particularly on young 



oysters at Wadmalaw Island, S. C. 



Destroyed more than 80 percent of the 



young oysters set on collectors. 



1958. Notes on a non-commercial crab of the 



genus Callinectes in trawl catches in South 



Carolina. Bears Bluff Laboratories, Wadmalaw 



Island, S. C, Contribution No. 27, 17 p. 



The abundance of Callinectes ornatus in 



trawl catches threatened the trawl crabbing 



industry. Restrictive measures aimed at 



protecting immature blue crabs actually 



protected C. ornatus. The data available did 



not indicate that C. ornatus competed with 



the blue crab for food and space. 



1968. Farming the salt marshes, p. 172-177. 



In John D. Newsom [ed.] Proceedings of the 



marsh and estuary management symposium, 



Louisiana State University, 1967. Thos. J. 



Moran's Sons, Inc., Baton Rouge. 



The price of crabs is usually too low to 

 make pond culture economically desirable. 

 In South Carolina, about 100 pounds of 

 crabs were grown annually in a 1-acre 

 pond. Male crabs were very large and most 

 weighed 20 ounces compared with the 

 3-to-8-ounce weight of the average crab in 

 the commercial catch along the Atlantic 

 and Gulf coasts. 



MacGregor, John S. 



1950. Some hydrographic conditions found in 

 winter in lower Chesapeake Bay and their 

 possible effects on the blue crab (Callinectes 

 sapidus Rath bun) population. M. A. thesis, 

 College of William and Mary, Williamsburg, 

 Va., 56 p. 



Experiments on the effect of low tempera- 

 ture with low salinity on blue crab activity 

 and the amount of mortality. Effect of low 

 temperature and light on the burying of 

 crabs. Results were related to hydrographic 

 conditions found during the winter dredge 

 fishery for crabs in Chesapeake Bay. 



Manning, J. H. 



1957. The effects of hydraulic clam dredging 

 on fish and crabs, p. 18-19. In J. H. Manning, 

 The Maryland soft shell clam industry and its 

 effects on tidewater resources. Maryland 

 Department of Research and Education, 

 Resource Study Report No. 11. 



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