Definition: pinardier

With a small tonnage, generally no larger than a coastal vessel, the pinardier has a sophisticated piping system designed to fill the tanks. Pinardiers enjoyed their heyday in the second half of the 20th century. They often sailed between North Africa and French ports (Sète, Marseille, Rouen). Pinardiers also exported wines from Bordeaux and the Loire region from Nantes and Bordeaux.

Their decline is mainly due to increasingly stringent safety standards for the transport of foodstuffs, which involve excessive costs for renovating terminals and ships. It can also be explained by the fact that wine is no longer traded in bulk, as wines are now mostly bottled at the place of production, with only low-end wines being transported in bulk.
The swell of the wine ship poem by Gregory Clusman:
The wind blows in the mainsail,
On a stormy ocean.
The death knell sounds, but despite the waves,
Nothing will capsize it.

Heading for Spain to pump,
White or red, dry or sweet,
Once in the hold, well negotiated,
We'll hoist the sail to set sail.

On the way back we'll descend,
In "wine class" at will,
If the weather is rough outside,
For us, the swell is all below.

In the hold, well shaken,
Steam perfumes the entire ship.
The captain, pale as he was,
Is now secured to the guardrail.

Once back, the remaining wine recovered,
By merchants and market gardeners.
We will always clean, drunk,
The empty cellars of this fine wine merchant.

It is well known that wines transported in bottles in the holds of ships matured exceptionally well, to the point that some ships were ballasted with wine and made very long round trips.
Another meaning of pinardier: wholesale wine merchant (pop.).