Why did slave ships stop at Martinique before sailing to Guadeloupe?

During the era of French colonial rule in the Caribbean, slave ships transported captives to the French Antilles under the authority of the Compagnie du Sénégal. These vessels typically called at Martinique before continuing their journey to Guadeloupe. This practice was established to permit Martinique, which served as the administrative center for the region for much of the 18th century, to have the first choice of the enslaved people being transported.12