Complete the summary using the list of words/phrases. Choose the correct word and move it into the gap.
 action

controls

failure

fish catches

fish processing

fishing techniques

large boats

marine reserves

the land

the past

Measures to protect the oceans

Up till the twentieth century the world’s supply of fish was sufficient for its needs. It was unnecessary to introduce [1] of any kind, because large areas of the oceans were inaccessible. However, as [2] improved, this situation changed, and in the middle of the twentieth century, policies were introduced to regulate [3].
These policies have not succeeded. Today, by comparison with [4] the oceans have very little legal protection.
Despite the doubts that many officials have about the concept of [5], these should be at the heart of any action taken. The consequences of further [6] are very serious, and may even affect our continuing existence.