FISHERY BULLETIN: VOL. 76, NO. 1 



sumer), a better knowledge of their accumulative, 

 metabolic, and storage abilities of toxicants, par- 

 ticularly carcinogenic chemicals, from the envi- 

 ronment is needed to safeguard human health as 

 well as shrimp health. Penaeid shrimps are known 

 to be very sensitive to certain classes of chemical 

 pollutants such as organochlorines and heavy 

 metals (e.g., cadmium) and, therefore, should be 

 utilized more in the future as indicator organisms 

 in environmental quality studies. 



ACKNOWLEDGMENTS 



Appreciation is expressed to Lee Courtney who 

 helped prepare the plates of figures and aided in 

 collecting data and certain of the figures included. 

 Steve Foss prepared some of the figures. Don 

 Lightner furnished two micrographs, and John 

 Corliss aided in identification of ciliates. Jack 

 Lowe provided summarized data on toxicity of cer- 

 tain compounds to penaeid shrimps. Robin Over- 

 street discussed some of the taxonomic problems 

 concerning helminths and brought to my atten- 

 tion several recent important references. Dean 

 Davenport and Chris Howell are thanked for con- 

 tributions of larval shrimp for disease study. 



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42 



