Stomach "mouth". The words "gastro-" and "gastric" (meaning related to the stomach) are both derived from the Greek word "gaster" (, meaning "belly"). Although the precise shape and size of the stomach varies widely among different vertebrates, the relative positions of the oesophageal and duodenal openings remain relatively constant. As a result, the organ always curves somewhat to the left before curving back to meet the pyloric sphincter. However, lampreys, hagfishes, chimaeras, lungfishes, and some teleost fish have no stomach at all, with the oesophagus opening directly into the anus. These animals all consume diets that either require little storage of
Coin in the fish's mouth symbolic act or sign, but there is little agreement concerning what it signifies. The Bible does not specify the species of the fish caught by Peter, but tilapia is sometimes referred to as "St. Peter's fish". Coin in the fish's mouth The coin in the fish's mouth is one of the miracles of Jesus, recounted in the Gospel of . In the Gospel account, in Capernaum the collectors of the two-drachma temple tax ask Peter whether Jesus pays the tax, and he replies that he does. When Peter returns to where they are staying, Jesus speaks of the matter, asking