Tahle 1. 



-Percentage of eggs of American oyster and hard clam that developed normally, percentage of larrae thai surrived, 

 d percentage increase m mean length, in the presence of different concentrations of chemicals ' — Continued 



and per 



Compound 



Concentration 



iJactei icicles— ContiniU'il 



Pcntacliloroplienol U I'XiKTiniint; aci-toni' 

 solution) 



Pcntacliloioplir'nji ao'tatc (1 cxiiiaiini'iit; 

 acetonr' solution) - 



PhPnnl (1 expel intent; water solution) 



Pnygon {2 expel intents; acetone solnlion) . 



Roccal (1 exiierinient; water snlulinn). 



Rosin Amine D (1 experimenl; acetone 

 solution}.. - 



Stllmet (1 experiment; water solutin 

 tinted veterinary foi-mula) ... 



Sulmet (1 experiment; water solutin 

 new nntinted liull* forjiiulalion ) 



TCC 11 experiment; wati'r soiulion) 



TCP il cxpi-riinent: uater 



P.p-w. 



.025 



.05 



.10 



.25 



.50 

 1.00 

 2.50 

 5. 00 



.026 

 .05 

 .10 

 .25 

 .50 



1. 00 



2. 60 

 5.00 



. 025 



.115 



. 1(1 



.20 



1.0 



2.0 



10.0 



100.0 



. 00025 



. 0050 



.01 



. 025 



. 050 



.10 



. 25 



.60 



1. no 

 .1 



LO 



. 025 

 . 115 

 .10 

 . 25 

 . 60 



1. (10 



2. .60 

 5.0(1 



.1 



1.0 

 2.0 



10,0 



too. 



5(r 00 

 KJO. 00 

 150. (10 

 200. 00 

 30<5. 00 

 400. 00 

 500. 00 



fioo. 00 



1,000. (10 



. 0025 

 .005 

 .01 

 .025 

 .05 

 .1 

 .25 

 .50 

 1.00 



. 026 

 .06 

 . 10 



..6(1 



1.00 



2. 6(1 



6. 00 



10.00 



Oyst.^rs 



Eggs 

 developing 



Survival of 

 larvae 



PiTccnt 











103 



110 



112 



102 



103 



U4 



102 



5 



110 



101 



(j9 







(1 







PiTcint 



115 



86 















41 

 

 







100 

 113 

 95 

 79 

 32 

 



90 

 95 

 94 

 108 

 108 

 110 

 112 

 101 



Clams 



Increase in 



length of 



larvae 



Eggs 

 developing 



Survival of 

 larvae 



Percent 



104 



SO 



60 



100 

 76 

 39 

 20 



1.60 

 1.66 

 14S 



i;iN 

 i;ii 



121 

 92 



HI 



101 



126 



105 



99 



113 



95 







97 



91 



65 



1 























97 



46 



103 



ins 

 111 



106 

 96 



Percent 



121 



131 



143 



130 



137 



Kill 



149 







99 



99 



104 



94 



5N 



34 















80 











97 

 113 



1(13 



loi; 



113 



( Relative percentages calculate<l by using survival and growth rates of 

 larvae in control cultures. 

 - 1 experiment only. 



3 Results xvith Dicldrin very eii;itic (see le\I). 

 ' Results with F.ndrin very erratic (see texl). 



402 



5 1 cultuie only; duplicate 97 percent mortality. 



'> 1st experiment. 



' 2d experiment. 



* 97 percent mortality in 1st experiment. 



^ 1 culture onl>-; dnplieilr loo percent mortality. 



Increase in 



lengtli of 



larvae 



109 

 114 

 115 

 119 

 125 

 12,S 

 55 



99 

 99 



31 

 21 



109 

 112 



lOli 



T.S. FISH AND WII.1.)LI KK SKKVICK 



