The Book of Household Management by Mrs. Beeton

that of all other created beings; and it is supposed they are, to a great extent, exempted from the diseases to which the flesh of other animals is heir. In place of suffering from the rigidity of age, which is the cause of the natural decay of those that "live and move and have their being" on the land, their bodies continue to grow with each succeeding supply of food, and the conduits of life to perform their functions unimpaired. The age of fishes has not been properly ascertained, although it is believed that the most minute of the species has a longer lease of life than man. The mode in which they die has been noted by the Rev. Mr. White, the eminent naturalist of Selbourne. As soon as the fish sickens, the head sinks lower and lower, till the animal, as it were, stands upon it. After this, as it becomes weaker, it loses its poise, till the tail turns over, when it comes to the surface, and floats with its belly upwards. The reason for its floating in this manner is on account of the body being no longer balanced by the fins of the belly, and the broad muscular back preponderating, by its own gravity, over the belly, from this latter being a cavity, and consequently lighter.