648 



Gerschenfeld, H. M., and E. Stefani. 1965. 



5-Hydroxytryptamine receptors and synaptic transmission in molluscan 

 neurones. Nature 205(4977): 1216-1218. 



649 



Ghiretti, F. 1966. 



Respiration. In Physiology of Mollusca. Karl M. Wilbur and C. M. Yonge 

 (eds.) . Academic Press, New York, Vol. II: 175-208. 



Contains references to Mevcenavia (Venus) mevcenavia abstracted elsewhere 

 in this bibliography. - J.L.M. 



650 



Gibbons, Euell. 1964. 



Stalking the Blue-Eyed Scallop. David McKay Co., Inc., New York:, 

 xiv + 332 p. (Chapter 3: Quahog or Littleneck: The Wampum Clam 

 (Venus mevcenavia) .) 



This account of Mevcenavia mevcenavia contains nothing new, and consists 

 mostly of recipes. There is also a line drawing of the inside and outside 

 of the shell on page 17. - J.L.M. 



651 



Gibson, F. A., and C. B. Duggan. 197.0. 



Experiments with the American hard-shelled clam (Mevcenavia mevcenavia) 

 1969. Ireland Dept. Agric. Fish., Fishery Leafl. 24, 6 p., 1 table, 

 1 figure. 



About 4,000 hatchery-reared seed clams were obtained from the Station at 

 Conway, North Wales, in April 1969. About 900 each were planted within 

 plastic mesh covered wooden frames to protect them from predators such as 

 green shore crab, Cavcinus maenas , at Wexford Harbour, Bannow Bay, Cork 

 Harbour, and Oysterhaven. In addition, about 400 were placed in a heated 

 water lagoon associated with the Electricity Supply Board power station 

 on the estuary of the River Shannon. The sites were examined three times, 

 the last being in October and November 1969. Two sites were suitable for 

 growing clams, Wexford Harbour and Cork Harbour, where the increment more 

 than doubled the length at planting, from 13.5 mm to 31.0 mm at Wexford to 

 13.0 mm to 30.0 mm at Cork, with only 17% and 25% mortality, respectively . 

 At the other two sites growth was slow and survival poor. The best growth 

 rate was found to be at extreme low water spring tide level, the deepest 

 at which clams were planted. Clams at the power station were not examined 

 closely enough to give data at this time. - J.L.M. 



652 



Gibson, F. A., and C. B. Duggan. 1973. 



American hard-shelled clam experiments in Irish waters. Ireland Dept. 

 Agric. Fish., Fishery Leaflet 49, 6 p. 



Results of experiments with 3 lots of clams, totalling 18,800, showed that 

 the hard clam, Mevcenavia mevcenavia, can be grown and fattened in 2 areas, 

 Wexford and Cork Harbours, to marketable size in 3 to 4 yrs , with mortalities 

 ranging from 16% to 27%. To offset predation, particularly by Cavcinus 

 maenas, juvenile clams up to 25 mm size must be protected by mesh covered 

 frames. Each frame, 2 ft x 2 ft can accommodate about 250 seed clams. 

 Stocking at higher densities increases mortality and decreases growth. 

 Costs of building frames and maintaining and servicing them are considerable. 

 Hard clams are relatively easy to rear in hatcheries, and large quantities 

 of seed can be produced. Costs are high, however, and the economic viability 

 of a commercial operation cannot be said to have been proven. The clam can 

 not reproduce in Irish waters because ambient temperatures are too low. - 

 J.L.M. 



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