The present invention relates to a sampling device. The sampling device comprises a separate compartment that is ejected creating an increased space or volume for a sample to be stored The sampling device of the present invention is suitable for collecting a sample in an aquaculture environment, enclosed system or in the gastrointestinal tract of a human or an animal. The invention also relates to a method of orally administering the device to an animal and recovering the device to carry out analysis on the collected sample for diagnosing the health of the gastrointestinal tract and determining nutrient absorption and digestibility.
