If you are planning a spearing trip to Spain (mainland or islands) be aware that Guardia Civil are now actively pursuing anyone with a speargun and coming down heavily if you don't have all the necessary documentation in order (membership of national organisation, doctors certificate etc. etc.) All this paperwork is a nightmare to sort out being a local let alone if you try and sort it before your trip! The 'cops' are now hauling people out of the sea, confiscating gear and imposing fines - if you want to buy a speargun in Spain you now have to be registered by the seller and if you don't have the paperwork then technically they can't sell you a gun as they can face a hefty fine. I found all this out on my recent trip to Spain and it seems that the powers-that-be are trying to make it very difficult for people to spearfish! Be warned.