Blue crabs

Orange Roughy 0.55 Crab (Blue, King, Snow) 0.06... 

Crab, blue (Callinectes sapidus), Chesapeake Bay area Crayfish Orconectes immunis). New York State area... 

Fig. 6. Approaches to minimising entrapment and impingement of fish and large aquatic invertebrates, eg, blue crabs, on trash screens at intakes, (a) An inlet pump house with vertical traveling screens mounted flush with a river shoreline to minimise obstmctions to animal movements (b) parallel flow to direct fish to a recovery chamber that returns to the water body (c) a velocity cap atop a vertical, offshore inlet induces a horizontal flow which fish avoid...

In one biosensor design, the chem preceptive nerve fibers of the anteimules of the blue crab Callinectes sapidus are coimected to a micropipet electrode. This assembly has been termed a receptrode (2). The receptrode created from Callinectes sapidus responds to the presence of amino acids (1) (qv) in concentrations as low as 10 M. 

Furthermore we find that the catch of blue crab in the Chesapeake Bay shows a periodic variation of 10.7 years in agreement with the solar photocycle of... 

We analyze here two kinds of records indicative of climate change, the yearly record of wheat prices in four European countries since 1200 A.D., and the yield of blue crab in the Chesapeake Bay since 1920, as examples of mathematical treatments that could be used on other temporal records of commodities derivable from archives. 

The blue crab (Callinectes sapidus) catches in the Chesapeake Bay have been measured [64] for the years 1922-1976 A.D., see figure 20. We have made a Fourier transform of the yield in millions of pounds per year (1 million pounds = 454 metric tonnes) versus years into amplitude versus period in years, see figure 21 and find principle cyclic periods of 8.6, 10.7, and 18.0 years. 

Figure 20. Annual catch of blue crab measured in millions of pounds per year in the Chesapeake Bay, a.d. 1920-1976. Key ----> measured -----> predicted.

Figure 21. Fourier transform of annual catch of blue crab vs. time into amplitude vs. period in the Chesapeake Bay.

For comparison, the periods of enhanced blue crab yield, of maxima of air temperatures at Philadelphia (which is close to the Chesapeake Bay), of minima of rainfall at Philadelphia, and of enhanced tidal forces (leading to high tides) are listed in Table 5. The explanation we offer for the agreement among the periods so listed is that high tides wash nutrient into the surface waters of the Bay, and higher temperatures warm the surface waters, and minimum rainfall allows the surface waters to become more saline, all of which factors are salubrious for crab growth. 

The periods of fluctuation of blue crab and their absolute phases and amplitudes listed in Table 5 have been used to reconstruct the annual yield of blue crab, Y, and project it into the future (shown by the dashed line in figure 20). The prediction formula is ... 

Annual Average of Blue Crab Catch in Chesapeake Bay... 

Blue crab, Callinectes sapidusr, whole less legs, 1.4 (0.5—5.7) DW 73... 

Neff, J.M. and J.W. Anderson. 1977. The effects of copper (II) on molting and growth of juveniles lesser blue crabs Callinectes similis. Pages 155-165 in C.S. Giam (ed.). Pollutant Effects on Marine Organisms. D.C. Heath and Company, Lexington, MA. 

Blue crab, Callinectes sapidus] Shrimp, Palaemonetes sp. Fish muscle ND in any tissue or whole body 169... 

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