Daily fish fact #782
Longspined porcupinefish!
As a defense against predators, this fish can swallow water into its stretchy stomach to quickly grow in size, erecting the sharp spines on its skin that otherwise lie flat! The stomach of the longspined porcupinefish is extremely specialised for this purpose: it is full of folds, has additional muscles surrounding it that squeeze out the water once it's time to deflate, and lacks any digestive ability.















