There is a widely recited saying that sharks kept in fish tanks won't grow to their full size.
For example, author and motivational speaker Bob Harrison posted:
A shark in a fish tank will grow 8 inches, but in the ocean it will grow to 8 feet or more. The shark will never outgrow its environment and the same is true about you. Many times we're around small thinking people so we don't grow. Change your environment and watch your growth.
Will a shark that normally grows to 8 feeet (2.4m) only grow to 8 inches (20 cm) when raised in a fish tank?