National Geographic: Over the last century or so, trawlers have gotten more powerful engines, fish-detecting radar, lighter nets, and vast onboard freezers. What the fleets might really need, though, is a time machine. After all, bottom-fishing fleets in United Kingdom waters today have to work 17 times harder to catch the same amount of fish as their sail-powered Victorian counterparts did, according to a new study. To address innovations have made fishing more efficient over the years, the …