My Lords, it is getting late, so I will try to be as brief as possible. I start by thanking the Minister and his officials for extensive discussion of this matter and my Oxford University colleague Professor EJ Milner-Gulland for her advice and help.
In earlier stages of this Bill I spoke against the use of MSY as a target in UK fisheries policy. I cited leading fisheries scientists from the UK and US, who described it as outmoded and dangerous. I also referred to the fact that leading jurisdictions such as Australia and the USA no longer use MSY, because they have recognised its limitations. Sadly, I have lost that battle. I now seek to ensure that the definition of MSY in the Bill minimises its potential for harm.
Just to recap briefly: the concept of MSY dates back to the 1950s. Fisheries scientists wanted to work out in theory how many fish one could catch without driving the stock to extinction. The answer can be summarised very simply: when the harvest exactly matches the recruitment of new harvestable fish, the population is in balance and the harvest is sustainable. Harvest a bit over this limit, and the fish population begins to decline to extinction; harvest below, and fishing opportunities are missed.
The trouble with this neat theoretical idea is that in practice you often do not have enough accurate information to calculate the rate of recruitment, nor do you usually know the precise harvest. That is why some fisheries harvested at MSY have in the past collapsed. These problems are compounded when dealing with mixed fisheries, where setting MSY for one species may incidentally cause another to be overfished. Furthermore, as the environment changes—for instance, as a result of climate change—the recruitment rate and other variables will change, so the MSY will no longer be appropriate. That is why the wording in the Bill needs to be changed.
Clause 48 defines MSY as
“the highest theoretical equilibrium yield that can be continuously taken on average … under existing environmental conditions without … affecting the reproduction process”.
The problems with this definition are as follows. First, it refers to a theoretical calculation rather than relying on actual data from the sea. Secondly, it refers to the recruitment process, which is only one factor that can affect the viability of fish stocks. Other factors, such as environmental change, can also be important. Thirdly, it is not appropriate for mixed fisheries.
My proposed change is very simple: remove the word “theoretical”, so that the calculation is based on real data, and replace “reproduction process” with “viability of the stock”, which allows for both environmental change and mixed fisheries.
I was pleased to hear the Minister say this afternoon that ICES is the body whose advice the Government respect and use. Here is what ICES says in its advice on the management of the exploitation of living marine resources:
“ICES considers ecosystem-based management … as the primary way of managing human activities affecting marine ecosystems with ecosystem-based fisheries management … specifically addressing the fishing sector.”
It goes on to say that MSY
“is a broad conceptual objective … The MSY concept can be applied to an entire ecosystem, a fish community, or a single stock. … ICES interpretation of MSY is maximizing the average long-term yield from a given stock while maintaining productive fish stocks within healthy marine ecosystems.”
My question to the Minister and his officials when I met with them was: why not simply use the ICES definition in the Bill? Remarkably, one of the officials said that, although he had helped to draft the ICES definition, the definition of MSY in the Bill could not be changed because it was the definition used in the common fisheries policy. I thought the point of Brexit was that we would determine our own way of doing things, but apparently not in this case; this has actually been a recurrent theme in debates on the Bill.
I fear that the Minister will not agree to change the wording in the Bill, even though I strongly believe that my wording is an improvement on what is currently there. If the Minister is not willing to change the wording, it would at least be encouraging if he were to reassure the House that the management of fisheries will be based on real data and that it will include broader ecosystem considerations such as environmental change. I beg to move.