![Save The Sharks on Twitter: "Did you know that sharks, unlike other fishes, do not have an operculum, which is a hardened protective lid over the gill! Sharks have two different ways Save The Sharks on Twitter: "Did you know that sharks, unlike other fishes, do not have an operculum, which is a hardened protective lid over the gill! Sharks have two different ways](https://pbs.twimg.com/media/Ex-5vDOWgAgizpY.jpg)
Save The Sharks on Twitter: "Did you know that sharks, unlike other fishes, do not have an operculum, which is a hardened protective lid over the gill! Sharks have two different ways
Shark Research at University of Miami - A pump is placed in the mouth to allow water to flow over the sharks gills and simulate ram ventilation. | Facebook
![National Aquarium on Twitter: "Imagine if you had to move around just to breathe! That's the case for sharks that breathe via ram ventilation. However, not all sharks need to swim to National Aquarium on Twitter: "Imagine if you had to move around just to breathe! That's the case for sharks that breathe via ram ventilation. However, not all sharks need to swim to](https://pbs.twimg.com/media/EBAlOAIXkAAUEtY.jpg:large)
National Aquarium on Twitter: "Imagine if you had to move around just to breathe! That's the case for sharks that breathe via ram ventilation. However, not all sharks need to swim to
![Structural adaptations for ram ventilation: Gill fusions in scombrids and billfishes - Wegner - 2013 - Journal of Morphology - Wiley Online Library Structural adaptations for ram ventilation: Gill fusions in scombrids and billfishes - Wegner - 2013 - Journal of Morphology - Wiley Online Library](https://onlinelibrary.wiley.com/cms/asset/46d870ad-cbae-4e38-b3ff-2ff4bff712fa/mfig001.jpg)
Structural adaptations for ram ventilation: Gill fusions in scombrids and billfishes - Wegner - 2013 - Journal of Morphology - Wiley Online Library
![PDF] PADDLEFISH BUCCAL FLOW VELOCITY DURING RAM SUSPENSION FEEDING AND RAM VENTILATION | Semantic Scholar PDF] PADDLEFISH BUCCAL FLOW VELOCITY DURING RAM SUSPENSION FEEDING AND RAM VENTILATION | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/4a271eab6bd59045be3005dc4323f25acedd23f9/4-Figure1-1.png)