A diver in an aquarium was allegedly bitten on the head by a large fish while feeding underwater in northern China.

The video was filmed in Xi'an City in Shaanxi Province on March 8.

A diver prepared to feed the large fish with the food in a bag with his right hand, a large fish suddenly attacked from behind, biting onto the bag and refusing to let go.

After a struggle, the diver managed to retrieve the bag, but the large fish seemed undeterred. As the diver approached its head, it suddenly opened its mouth and bit the diver's head.

In response, the diver stated that the fish merely sucked on his head. "Although the fish was large in size, it didn't have teeth and mainly swallows its food," the diver said. "When it tried to swallow the bag, I quickly pulled it away. It sucked my head for a moment, but I didn't feel much."

Officials from the aquarium confirmed that they were promptly informed of the incident and stated that due to proper safety measures, the diver was unharmed.

The fish involved is a kaluga, originating from 130 million years ago, known for its aggressive nature. Kalugas are large carnivorous fish, with a length of up to 5.6 metres, weighing over 1000 kilograms, and can live for over 50 years.

The video was provided by local media with permission.

3月8日，陕西西安，一海洋馆内潜水员下水喂食时突然被大鱼咬头部。
目击游客拍摄的视频显示，潜水员拿着装满小鱼的袋子喂食大鱼，他右手把拿出一把小鱼准备投喂，左手里的袋子遭到身后一只大鱼的突然袭击，大鱼咬住袋子不肯松口，潜水员几经搏斗终于拿回了袋子，然而大鱼似乎并没有因此罢休，在潜水员头部靠近它的时候，它突然张开大嘴咬了潜水员的头部。
对此，潜水员回应称，事发时鳇鱼吸了一下他的头部。潜水员说：“鳇鱼虽然体型大，但是它没有牙齿，进食主要靠吞咽。当时它想吞了鱼袋，我赶紧把袋子拿出来，它吸我一下我就躲开了，没啥感觉。”
海洋馆相关负责人称，事后第一时间掌握情况，因防护措施到位，潜水员未受伤无大碍。 资料显示，鳇鱼是鲟鱼的一种，起源于一亿三千万年前，性情凶猛，属于大型肉食性鱼类，长可达5.6米，重可达1000千克，能活50年以上。