JAW946's picture

Hurghada Nov 2011 017

Observed: 13th November 2011 By: JAW946
S159 Neighbourhood Nature - current student
Red Sea Stingray
Description:

Body width was approx 100cm. It was resting on a sandy bottom in the shaddow of a large ship wreck at a depth of approx 25m.

Identifications
Species interactions

No interactions present.

Comments

chrishardman's picture

Sharks and rays

Does anyone know how sharks and rays control their buoyancy without a swim bladder

JAW946's picture

Sharks and Rays buoyancy

My understanding is as follows. Sharks and rays have to move forward to maintain their position/depth. Rather like a plane flying through the air. No forward motion and they sink. Fish with swim bladders act like a hot air balloon. They can maintain their vertical position without the need for forward motion.

Hope this helps

Jeff