hatchery operations are simulated in the model. The model suggests that 

 seeding has no significant impact on harvestable yields, but instead in- 

 creases the predator population. Unless predation is controlled, subsidiza- 

 tion of hatcheries does not appear to be warranted. - J.L.M. 



2218 



Sutcliffe, W. H., Jr., K. Drinkwater, and B. S. Muir. 1977. 



Correlations of fish catch and environmental factors in the Gulf of Maine. 

 J. Fish. Res. Bd. Canada 34(1): 19-30. 



A two-year lag for commercial catch of this species seems reasonable 

 (r = 0.805). Recently, most hard clams harvested are near the lower size 

 limit in Maine (5.1 cm), and approximate two-year olds. Correlation of 

 hard clam catches with temperature two years previously appears quite good, 

 and the month chosen appears reasonable (August) . Three-year running means 

 were used. Results should be used with caution. - J.L.M. 



2219 



Swinehart, James H . , and Kenneth W. Smith. 1979. 



Iron and manganese deposition in the periostraca of several bivalve molluscs. 

 Biol. Bull. 156(3): 369-381. 



Species examined were the freshwater molluscs Anodonta calif omiensis and 

 Unio novahollandae and the marine mollusc Mytilus calif ornianus . Meraenaria 

 meraenaria was not mentioned. - J.L.M. 



2220 



Sykes, J. E. 1971. 



Implications of dredging and filling in Boca Ciega Bay, Florida. Environ. 

 Lett. 1: 151-156. 



Important references to Meraenaria meraenaria unlikely. Did not search 

 beyond SUNY-Stony Brook library. - J.L.M. 



2221 



Szent-Gyorgyi, A. G. 1976. 



Comparative survey of the regulatory role of calcium in muscle. In 

 Calcium in Biological Systems. Symposia of the Society for Experimental 

 Biology XXX, Cambridge Univ. Press, London: 335-347. 



Contraction of all muscles so far studied is triggered and controlled by 

 calcium ions. The calcium binding protein has a significantly higher molec- 

 ular weight (22,000 daltons) than the parvalbumins present in vertebrate 

 muscles, and also contains tryptophan and tyrosine residues. Molluscan 

 muscles lack troponin components, but it is possible that some components of 

 troponin, possibly in altered form, are synthesized in these muscles. De- 

 sensitized scallop myofibrils combine with great affinity with regulatory 

 light chains of Meraenaria myosins. These light chains retain a similar 

 binding site to the heavy chains of scallop myosin, indicating that these 

 sites on the heavy chains and light chains have been conserved during evo- 

 lution. In addition to these invariant sites, there are calcium dependent 

 interactions between heavy chains and regulatory light chains that corres- 

 pond to the "on" and "off" states of myosin. - J.L.M. 



2222 



Taylor, J. D., N. J. Kennedy, and A. Hall. 1969. 



The shell structure and mineralogy of the Bivalvia. Introduction, 

 Nuculacea-Trigonacea. Bull. Br. Mus. Nat. Hist., Zool., Suppl. 3: 1-125. 



Missing from SUNY-Stony Brook library and apparently lost. Did not search 

 further. - J.L.M. 



616 



