Wade is keenly aware that he is working in a changing world. As he put it: "I understand that people have to get their food but the size and numbers of fish has declined badly in the past 50 years. Fishing in the Amazon is now big and sophisticated and some big fish have all but disappeared. And the season floods in tropical places are more unpredictable with an effect on river levels. In the past five to seven years seasonal rise and fall of river levels far more unpredictable and this can damage species such as River Turtles in Guyana when they lay their eggs. But things can be done. In the Colombia river in North West American sturgeon have been brought back when it was feared they were on the verge of extinction."