CONTENTS 



TABLES 



No. 



Page 



Introduction 1 



Types of marks 1 



Primary marks 1 



Secondary nnarks 2 



Double- injection method of marking 2 



Single -injection nnethod of marking , 6 



Tattooing 7 



Summary 7 



Acknowledgn-ient 8 



Literature cited 8 



FIGURE 



No . 



1. Location of nnarking nnaterials in double-marked shrimp 5 



1. Inks and dyes tested and found to be unsatisfactory for use as primary marks 3 



2. Trade nannes and manufacturers of secondary marking materials 5 



3. Results of experiments to determine the suitability of checkwriter inks used with fast 



green FCF 6 



4. Summary of experiments involving fluorescent marks applied by the double-injection 



technique of marking 6 



5. Comparative survival of shrimp receiving no mark, injected with distilled water, or 



marked with a mixture of two dyes 7 



