Biodiversity Beyond National Jurisdiction Bill

Lord Krebs Excerpts

Tuesday 2nd December 2025 Lords Chamber

[Lord Krebs (CB)]

My Lords, I join others in welcoming the noble Lord, Lord Whitehead, to the Front Bench and congratulate him on his excellent maiden speech. I was particularly glad that he gave several marketing plugs for the National Oceanography Centre, which I was responsible for setting up when I was the chief executive of the Natural Environment Research Council. I also thank the noble Baroness, Lady Chapman of Darlington, for her helpful briefing session on the Bill last week.

I fully support the Government’s intention to ratify the high seas treaty by mid-January 2026 and can see no good reason for preventing this. As the legal adviser to the Alliance of Small Island States said, before the treaty, the high seas were known as the “wild, wild wet”. They are the classic example of the tragedy of the commons. Against this background, I would like to ask the Minister three questions. First, what are we talking about when we refer to marine biodiversity? Secondly, what are the main threats to marine biodiversity? Thirdly, how will the treaty be enforced?

The treaty aims to protect marine biodiversity in the high seas outside exclusive economic zones, but no one knows how many species there are in the oceans. According to the world register of marine species, there are about a quarter of a million known marine species and new species are being discovered at a rate of nearly 2,500 per year. Most of these new species are microscopic benthic crustaceans, molluscs and annelids. It is estimated that there are probably between 1 million and 2 million species still to be discovered. In other words, about 90% of marine biodiversity is unknown, and if we include bacteria and other micro-organisms, the number remaining to be discovered is much greater. In short, we do not know what it is that this treaty aims to protect. Therefore, can the Minister assure us that the Government will support research efforts in our universities, museums and research institutes to fully document marine biodiversity so that we have a better idea of what we are aiming to protect?

My second question concerns the threats to marine biodiversity. There is widespread agreement that human activity is causing the extinction of many species both in the oceans and on land. The Marine Conservation Society lists overfishing, by-catch, climate change, pollution and other human activities such as deep-sea mining among the major causes of loss of marine species. Nearly 38% of the world’s stocks are overfished and an estimated 9 million tonnes a year of fish and other marine organisms are thrown away dead as by-catch. According to the latest figures from Defra, 54% of fish stocks in UK waters are currently overfished. Can the Minister therefore assure us that the Government will press for sustainable management of fisheries in the high seas and reductions in by-catch and, at the same time, set a leadership example by managing our own fish stocks sustainably?

Can the Minister also tell us whether deep-sea marine mining will be included in the treaty? Flora and Fauna International points out that the hotspots for marine biodiversity are often associated with deposits of rare minerals such as cobalt and manganese. These hotspots include the hydrothermal vents where tectonic plates meet and are home to extraordinary creatures able to survive in near-boiling water full of highly toxic chemicals.

I now turn to my third question, on enforcement. The Marine Biological Association says:

“If we have learned anything about marine protected areas within national jurisdiction, designating marine protected areas does not mean effective protection”.


As I understand it, the current regime for enforcement of the law of the sea is based on flag state responsibility. Countries are expected to create offences under national laws and prosecute if there is a violation. The difficulty is that under this regime, vessels can opt for flags with countries that have poor regulation and poor records of prosecution. Can the Minister therefore tell us how the Government envisage the treaty will be effectively enforced?