Here's one we did:

Take a plastic coke or other soft drink bottle. Cut the top third off (don't measure! It will work out with a guess). Take the top third off. Turn it upside down, and put it into the bottom. Then what you have is the top which fits into the bottom, the top being upside down. Then fasten it. Fishing line works, threaded in holes you make towards the top with a hot needle or something.

Then put some bread, corn meal, meal with curry, whatever you have into the bottle. About a table spoon full. Tie some fishing line to it. Put it into the water. Use a stick or something to fasten it to the bank.

Wait a couple hours. Small fish will swim into the inverted top to get to the bait, and not be able to find their way out.

You will almost certainly catch fish that the locals haven't seen, and perhaps find new species.

If nothing else, the small fish you catch make good bait for bigger fish, and the kids will be VERY appreciative to you for showing them this technique, and at best, you will find fish new to science.

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Tim Vaughan, 48 years old, member Redeemer OPC, Santa Maria CA.