Apnea encompasses a wide range of breath-hold activities that require specialised equipment for improved performance. Low volume masks, low friction wetsuits and specialised fins will help you go further and stay down longer.
Spearfishing uses much of the same equipment as freediving and can only be done while freediving in most countries. Spearfishing is now considered one of the most environmentally friendly form of fishing due to being highly selective, having zero by-catch, very little damage to habitat and no pollution.
Spearguns either use elastic energy or pneumatic power to strike the hunted fish.