1183 



MacCrimmon, H. R. , J. E. Stewart, and J. R. Brett. 1974. 



Aquaculture in Canada: The practice and the promise. Fish. Res. Bd. Canada, 

 Bull. 188, 84 p. 



Contains 3 papers: Freshwater aquaculture in Canada by Hugh R. MacCrimmon; 

 Potential for culture of invertebrates in Canada by James E. Stewart 

 (abstracted elsewhere in this bibliography) ; and Marine fish aquaculture in 

 Canada by J. R. Brett. Quahaugs (Mercenaria mercenaria) are among those 

 species that could be cultured on a small scale until further technical and 

 market data can be obtained. - J.L.M. 



1184 



MacGinitie, G. E. 1932. 



The role of bacteria as food for bottom animals. Science 76(1978): 490. 



No mention of Mercenaria (Venus) mercenaria. - W.J.B. 



1185 



MacGinitie, G. E. 1937. 



The use of mucus by marine plankton feeders. Science 86(2235): 398-399. 



No mention of Mercenaria (Venus) mevaenavia. - W.J.B. 



1186 



MacGinitie, G. E. 1939. 



Littoral marine communities. Am. Midi. Nat. 21(1) : 28-55. 



No specific mention of Mevaenavia mercenaria. - J.L.M. 



1187 



MacGinitie, G. E. 1941. 



On the method of feeding of four pelecypods. Biol. Bull. 80(1): 18-25. 



Mercenaria (Venus) mercenaria is not mentioned. - M.W.S. 



1188 



Maclnnes, John R. , Edwin W. Rhodes, and Anthony Calabrese. 1974. 



A new electronic system for counting and measuring bivalve larvae. 

 Chesapeake Sci. 15(3): 174-176. 



In large-scale growth studies, measurement with ocular micrometers is 

 tedious and time-consuming. The system described consists of a microscope, 

 television camera and monitor, and a digital analyzer. Magnified images 

 from the microscope are transmitted to the monitor. On command, larval 

 images in an entire field are counted and measured. Particles smaller than 

 clams can be eliminated by a lower-limit selecter. Projected length, 

 longest dimension and area can be measured. Analysis of length-height 

 ratios from 1,600 larvae showed that the relationship is very uniform, 

 confirming that length is as useful as area. Over 80 y, area increases 

 slightly more rapidly in relation to length. The aspect ratio (T) , defined 

 as T = L 2 /4A, where L = longest diameter and A = area, declines slightly 

 with increasing size, at least in larvae over 100 \i . Differences in shape 

 factors might be useful for separating larvae of different species . The 

 probable error of measurement is similar to that of the manual method. 

 - J.L.M. 



332 



