TvHLE 1 -Percenlaqe of eggs of American oyster and hard clam thai developed "or'ually percentage of larvaejMt survived, 

 andpereentale ZereLe in mean length, m the presence of different concentrations of chemicals '-Continued 



Compound 



Concentration Eggs 



developing 



Herliicides— Continued , 



2-4-D salt (2 experiments; water solution) 



Diuron (1 experiment; water solution) 



EMID {4 experiments; water solution) 



EuduthalC2 experiments; water solution)-. 



Fenuron (2 experiments; water solution). 



MCP-iV (2 experiments; water solution) . 



Monuron (1 experiment; water solution). 



Neburon (1 experiment; water solution). 

 Sllvex CI experiment; acetone solution)... 



Nemiitocide: , ,. , 



Ncmagon (2 experiments; acetone solution) 



Solvents: 



Acetone (1 experiment; conlnmed by 

 others) 



See footnotes at end of lahlo 



P. p.m. 



.025 



.05 



.10 



.25 



.50 



1.0 



2.6 



6.0 



10.0 



26.0 



60.0 



100.0 



.25 



.50 

 1.00 

 6.00 



.25 



,50 



1.0 



2.5 



6.0 



10.0 



26.0 



60.0 



100.0 



.25 



.50 



1.00 



2. 60 



5.00 



10.0 



25.0 



50.0 



100.0 



,025 



.050 



.20 



.25 



.50 



1.00 



2.00 



4.00 



5.00 



10. no 



.25 



.50 



1.00 



2. 60 



5. 00 



10.00 



25.00 



SO. 00 



100. 00 



.25 



.50 



1.00 



5.00 



2.4 



4.S 



.025 

 .06 

 .1 

 .25 

 ,50 

 1.0 

 2.5 

 6.0 

 10,0 



.25 

 ..50 

 1 .00 

 2 .60 

 5 .00 

 10.00 



10.0 



25.0 

 50.0 

 100.0 

 260 .0 



84 

 91 



29 



32 







103 

 101 



107 



im 



101 



90 



2 











95 



lOK 



101 



91 



102 



94 



57 



1 







100 



103 



99 



94 



96 



80 















100 

 81 

 75 

 78 

 66 



162 



122 



158 



Oysters 



Clams 



Survival of 



larvae 



Ptrccnt 



84 



98 



93 



92 



89 

 102 

 103 

 112 



97 

 104 



62 



45 



96 



106 



106 



98 



61 



11 







97 

 98 

 97 

 111 

 109 

 109 

 74 

 48 



75 

 89 

 89 

 88 

 80 



102 



86 







Increase in 



length of 



larvae 



PtTcent 

 148 

 194 

 134 

 124 

 111 

 119 



83 



86 



62 

 39 

 8 



81 

 99 



87 

 94 

 82 

 78 

 47 

 1 



124 



148 



1J9 



KiO 



129 



119 



96 



90 



18 



110 

 86 

 77 

 61 

 30 

 14 



128 

 108 

 91 

 94 



Eggs 

 developing 



Survival of 



larvae 



92 



91 



81 







85 

 98 

 93 



89 

 7U 

 51 

 



100 

 100 

 100 

 '91 

 ' 92 



'95 

 « 115 



91 



92 











100 



91 



107 

 98 

 93 



Percent 



128 



112 



127 



5 100 



100 

 104 

 103 

 92 

 91 

 60 







92 

 63 

 69 

 86 



'75 



'■'95 



M) 



«0 



' 115 



»0 



120 

 122 

 128 

 HI 

 

 



116 

 97 

 14 



<1 





 



100 

 100 

 100 

 lOO 

 100 



Increase in 



length of 



larvae 



Percent 



99 

 101 

 94 



104 

 108 

 104 

 99 

 91 

 64 



«76 



»64 



6 38 



' 110 



'115 



'■S119 



«0 



«0 



' 109 



»0 



114 



109 



86 



93 



76 

 30 

 21 

 4 



110 



104 

 91 

 91 



87 



400 



U.S. FISH AND WILDLIFE SERVKK 



