I do, yes.
One thing you have to do is to look at the historical context of fishing. Where people have fished for long periods of time, what tends to happen is that we remove the large-bodied animals. We deplete those populations. We start moving on to less desirable species, and then those species get depleted and we move to others. Progressively, we ramp up fishing technology to become more efficient, which also means it is more invasive and destructive.
One problem we see is the supplanting of, let's say, hook-and-line and net fisheries for species like cod, with bottom trawls. The bottom trawls are then supplanted by bottom trawls for prawns, which have finer-mesh nets. Those also are used alongside scallop dredges of seabed habitat. Progressively, what we see is a reduction in abundance, diversity, habitat complexity, integrity, and viability. We've seen that happen over very large areas of the sea around northern Europe, eastern Canada, and eastern U.S.A, for example. It's a progressive process.
We have to start thinking about how we rebuild populations to levels that are much more productive, where habitats are able to recover, where long-lived species are able to rebuild their populations, and where big fish can survive for long enough that they become highly successful reproductively and are the engines of reproduction within a population. We need to provide space for ecosystems to achieve that level of complexity, integrity, high biomass, and high diversity once again.
If you want the cod back in eastern Canada, you need to get the prawn trawls out of large areas of the fishing grounds there, because they're catching juvenile cod. They're not going to be surviving up to reproductively active ages. We see this in the Irish Sea in the U.K. The cod population was hammered, and then we replaced that fishery with fisheries for prawns and scallops. As long as that fine-mesh netting is going on, there is no prospect of recovery of the biggest species that have been lost as a consequence.
If we want those back, we need spatial management. There need to be areas that are off-limits to mobile fishing gear. There need to be areas that are zoned for prawn trawling, which are going to be exploited in that way. We need scallop-dredging zones, but we need no-take zones too. It's part of the portfolio of management to achieve a broad mix of outcomes for the marine environment.
Apart from anything else, we need to rev up the engine of ocean ecological processes once again, because they underpin the habitability, not only of the sea but of the planet as a whole. The oceans occupy most of the living space on the planet, which means that what goes on in them is profoundly important to all of us. If we let those ocean ecosystems get knocked down to the low abundances and diversity that we're seeing, then we're in trouble over the long term. It's part of improving the resilience of the system and enabling it to recover to levels of higher productivity. That will sustain fisheries and surrounding areas, and that's a good management portfolio.