Shark in Aquarium
A shark swimming in a large aquarium. Sharks are ancient ocean predators that help keep the sea balanced.
What is it?
This is a shark swimming in a big glass tank at an aquarium. Sharks are fish, but they don't have bones — their skeleton is made of cartilage, like your ears. Their skin feels like sandpaper because it's covered in tiny tooth-like scales called dermal denticles. Sharks have been in the ocean for over 400 million years, even before dinosaurs!
How old?
Sharks are very old animals. They first appeared more than 400 million years ago. That's before the first dinosaurs! The shark you saw might be many years old, but some sharks can live for a long time — like the Greenland shark, which can live over 400 years.
What was it like?
The shark was swimming in the aquarium. It moved smoothly and quickly. Next to it were many small fish. Sharks are top predators, meaning they are at the top of the food chain. They eat fish, seals, and other animals. But not all sharks are big — some are as small as your hand!
Why does it matter?
Sharks are important for the ocean. They eat sick or weak fish, which helps keep fish populations healthy. Without sharks, the ocean would be out of balance. Unfortunately, many sharks are in danger because people catch too many of them for their fins and meat. Some sharks are also accidentally caught in fishing nets. Aquariums help people learn about sharks and why we need to protect them.
Connections
Next to find
- A shark tooth fossil at a museum
- A book about different kinds of sharks
- A documentary about ocean predators
- Another animal that is a top predator, like a lion or an eagle
水族馆里的鲨鱼
一条鲨鱼在大型水族馆里游动。鲨鱼是古老的海洋捕食者，帮助保持海洋平衡。
它是什么？
这是一条在水族馆的大玻璃缸里游动的鲨鱼。鲨鱼是鱼，但它们没有骨头——它们的骨骼由软骨组成，就像你的耳朵一样。它们的皮肤摸起来像砂纸，因为上面覆盖着微小的齿状鳞片，叫做盾鳞。鲨鱼已经在海洋中存在了超过4亿年，甚至比恐龙还早！
多古老？
鲨鱼是非常古老的动物。它们最早出现在4亿多年前。那是在第一批恐龙之前！你看到的鲨鱼可能已经好几岁了，但有些鲨鱼可以活很长时间——比如格陵兰鲨，可以活400多年。
它是什么样的？
鲨鱼在水族馆里游动。它移动得平稳而迅速。它旁边有很多小鱼。鲨鱼是顶级捕食者，意味着它们处于食物链的顶端。它们吃鱼、海豹和其他动物。但并非所有鲨鱼都很大——有些小到只有你的手那么大！
为什么重要？
鲨鱼对海洋很重要。它们吃生病或虚弱的鱼，这有助于保持鱼类种群健康。没有鲨鱼，海洋就会失去平衡。不幸的是，许多鲨鱼正面临危险，因为人们捕捞太多鲨鱼获取鱼翅和肉。有些鲨鱼也会意外被渔网捕获。水族馆帮助人们了解鲨鱼以及为什么我们需要保护它们。
联系
接下来寻找
- 在博物馆找一颗鲨鱼牙齿化石
- 一本关于不同种类鲨鱼的书
- 一部关于海洋捕食者的纪录片
- 另一种顶级捕食者动物，比如狮子或老鹰