791 



Haskin, Harold H. 1952. 



The selection of food by the common oyster drill, Uvosalpinx einevea, Say. 

 Proc. Natl. Shellf. Assn., Ann. Meeting, Atlantic City, N.J., 21-24 August 

 1950: 62-68. 



Mevaenavia (Venus) mevaenavia is not mentioned. Drills were attracted to 

 certain oysters by some chemical attraction, not by thickness of shell. 

 Rate of growth, rather than size and age per se, appeared to be the princi- 

 pal factor determining attractiveness of oysters to drills. - J.L.M. 



792 



Haskin, Harold H. 1952. 



Further growth studies on the guahaug , Venus mevcenavia. Proc. Natl. Shellf. 

 Assn. 42: 181-187. 



Growth rates of hard clam vary greatly from season to season. In the period 

 1947-1950, 1947 was the best growing year, 1948 poorest. Clams grown from 

 10 g seed would produce medium-size clams in 4 yrs if 1947 growth rates 

 prevailed, 8 yrs at 1948 rates, 6 yrs at 1949 rate, and 5 yrs at 1950 rate. 

 Years 1948 and 1949 were hot, dry summers, 1947 and 1950 cool and wet. A 

 composite growth for all 4 yrs showed that 10 g seed made the greatest 

 absolute weight gain (34 g) in the 3rd season after planting. By the 6th 

 season it levelled off at 12-16 g. Growth in various areas in N.J. , including 

 Raritan Bay, is highly variable. On the Cape May shore clams reached about 

 200 g in 8 yrs, in Jarvis Sound less than 50 g in the same time. Raritan Bay 

 was intermediate. Thus, Jarvis Sound had best growth in an earlier study, 

 poorest in the present one. Raritan Bay growth improved from the previous 

 study. Great differences in amounts of nutrients also were found between 

 these areas. Plantings where growth was best were swept with strong tidal 

 currents and received quantities of land drainage. Best growth was also in 

 areas with sparse clam populations. One season's growth data are not 

 sufficient to predict growth rates at one location. Growth rate is well 

 correlated with available food. Land drainage and circulation patterns also 

 are important. - J.L.M. 



793 



Haskin, Harold H. 1954. 



Age determination in mollusks . Trans. N.Y. Acad. Sci. 16(6): 300-304. 



Preliminary studies on hard clam revealed that size frequency relations were 

 an unreliable index of age due to sporadic sets and depletion due to fishing. 

 Growth checks on the shells could not be interpreted confidently without 

 further knowledge of the population. Marked clams (4-10 cm long) were planted 

 in six areas along the New Jersey coast. Annual average increments in weight 

 were obtained for each area and relative growth curves were plotted. Seed 

 clams down to 1 gram in weight were planted and after one season were approxi- 

 mately 10 grams, indicating that 10 gram clams in this area were 2 years old. 

 Using this information, absolute growth curves could be constructed. These 

 growth curves provide a basis for interpretation of growth rings on clam 

 shells. - D.L. 



794 



Haskin, Harold H. 1962. 



The hard clam population of Raritan Bay, survey of April 9-13, 1962. A 

 Report to the Commissioner of Health, and the Commissioner of Conserv. and 

 Econ. Devel. of the State of New 'Jersey, 3 p. + 2 figs. 



Hard clams were abundant in two major areas, one along the Raritan Bay 

 channel west of the Navy pier, and the second in Sandy Hook Bay. The 

 standing crop in these two areas is estimated at 600,000 bushels. The 

 population along the Raritan Bay channel is composed mostly of chowder-size 



220 



