CONTENTS 



Page 



Introduction • 1 



Acknowledgniants .•••••....••..••••••••••••••••• ........,....»....•• 1 



Pond and tank experlmenta with extracts of food and other materials •••.« 2 



Catching and establishing the fish • ...•••••• 2 



Feeding the fish 2 



Materials and testing prooediires • •• 2 



Response to extracts of "natiiral" food substances ••*• 4 



Response to chemical compounds 7 



Discussion 8 



Pond experiments with edible lures »..*. •• 8 



Materials and methods of preparation 9 



Method of testing 10 



Results 10 



Discuasion .....••*•• ••• • 13 



Sea tests with extracts ..•••«•*..*•« ..•...*••• 13 



Preparation of material •• •.... •«•*..• IS 



Methods of testing 14 



Results ••• 14 



Discussion .* * • ••• •• 14 



Sea tests with inedible lures 15 



Materials 15 



Methods of testing ••• 15 



Re suits ...••«..... • 16 



Discussion • ...•• 16 



Sea tests with edible lures •••..... ••••• 16 



Materials 16 



Methods of testing 17 



Results 17 



Discussion ...••. .«...•.•*«•.•••*••*.•••..••.•••••••••••• 18 



