The regulations are very simple. There is no license required, you can own and use any type of speargun you like.
However, there are some rules as regards the catch.
You are allowed to catch only one turbot bigger than 45cm in diameter (from the tip of the head to the end of the tail). This practically means a fish bigger than 2 kg. If you catch more than one turbot the fine starts from 250 euro and can go up to 500 or even higher. I'm not sure how high.
As for the other species, the law says that you are allowed to catch up to 3 kg of fish per session, plus one fish bigger than 3 kg. However, this is only by law and I would be very surprised if even the authorities know about it. This rule has never been enforced, so practically if you can catch more than 3 kg of fish no one will give you any trouble about it.
However, there are some rules as regards the catch.
You are allowed to catch only one turbot bigger than 45cm in diameter (from the tip of the head to the end of the tail). This practically means a fish bigger than 2 kg. If you catch more than one turbot the fine starts from 250 euro and can go up to 500 or even higher. I'm not sure how high.
As for the other species, the law says that you are allowed to catch up to 3 kg of fish per session, plus one fish bigger than 3 kg. However, this is only by law and I would be very surprised if even the authorities know about it. This rule has never been enforced, so practically if you can catch more than 3 kg of fish no one will give you any trouble about it.