Pavlov's Fish

The BBC reports on a new technique that could be used for fish farming. Experiments on sea bass have shown that they can be trained to come for food by associating feeding with a specific sound signal. It takes about 4 weeks to train the fish. This method means that cages would no longer be required, which actually might also cut down diseases that are associated with fish living in close quarters. The biggest drawback is predators, since the instinct for survival is greater than that of association with food. This would mean the fish would need be protected by other larger fish or even mechanical dummies, in much the same way that a sheepdog guards its sheep.