Posts tagged ‘Hull’

How do barnacles get on a ship’s hull?

Barnacles on Ship Hull

Barnacles can swim at birth.  When they reach adult stage, they attach themselves to objects in the water and grow a shell.

If you have ever visited a seacoast where there were rocks and piers you have almost certainly seen barnacles, for the “crush” you saw on the wharf’s pilings and the rocks was made up of millions of salt water shellfish called barnacles.

When barnacle is first hatched, it resembles a young water flea and can swim about in the water.

But when it reaches adult stage it can no longer swim, so it attaches itself to any convenient object, such as the hull of a ship, piling, rock, whale, or even a sting of seaweed.

Once attached, a hard lime-like shell  forms around the barnacles.  The barnacle eats by waving its feathery legs through an opening in the shell to pull tiny sea creatures and plants into its mouth.

In olden days, sailor of wooden sailing ships had to periodically pull their ships ashore to scrape off the masses of barnacles clinging to the hulls, because they reduced the ship’s speed and made steering difficult.  Today, special paints, prevent growth of barnacles. – Dick Rogers

What are barnacles?

Barnacles

A barnacle is a short salt water shellfish that attaches itself to ship hulls, rocks, docks and other underwater objects.  Anyone who goes to the seashore is likely to see barnacles.

A barnacle hatches from an egg as a tiny, free-swimming creature.  But soon it fastens itself to any convenient object, such as the hull of a ship, pilling, rock, or even a passing whale.

Once attached, a hard, limy shell grows around the barnacle. The barnacles stays for the rest of its life in the place where it settles.  It eats by waving its feathery legs through an opening in the shell to pull tiny sea creatures and plants into its mouth.

The shell has a lid that can be closed in case of danger.

To sailors the barnacle is a trouble.  Masses of them clinging to a ship’s hull reduce the ship’s speed.  The only way to remove barnacles’ shell is to put the ship in dry dock and scrape its bottom.  – Dick Rogers