The worldâs fish and seafood populations will collapse by 2048 if current trends in habitat destruction and over fishing continue, resulting in less food for humans, according to the latest research. An analysis of scientific data going back to the 1960s and historical records over a thousand years, has shown researchers that marine biodiversity – the variety of ocean fish, shellfish, birds, plants and micro-organisms – has declined dramatically, with 29% of species already in collapse. Extending this pattern into the future, the scientists have calculated that by 2048 all species would be in collapse, which the researchers have defined as having catches decline 90% from the maximum catch. This applies to all species, from mussels and clams to tuna and swordfish. Ocean mammals, including seals, killer whales and dolphins, are also affected.