![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
![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
![Leo Chan Gaskins on Twitter: "Lemon Sharks (Negaprion brevirostris) are very adaptive! Sharks have two ways to breathe - either obligate ram ventilation (must swim to breathe to get water past gills) Leo Chan Gaskins on Twitter: "Lemon Sharks (Negaprion brevirostris) are very adaptive! Sharks have two ways to breathe - either obligate ram ventilation (must swim to breathe to get water past gills)](https://pbs.twimg.com/media/Dr-bikSWwAAh2tM.jpg)