Allan Moses in which he was described as "our Grand Manan ornithologist", who "makes birds his specialty and his pastime". John Thomas Moses died in 1885. His son John Russell Moses, born in 1853, was Allan Moses's father. John Russell Moses learned taxidermy from his father and continued to build the family collection of mounted bird specimens, while prospering as a businessman. He was one of Grand Manan's major fish buyers, with a processing plant in North Head. Part of his business was selling the dried swim bladders of hake for the manufacture of isinglass. This was highly profitable, as the bladders
Swim bladder duct, allowing the fish to fill up the swim bladder by "gulping" air. Excess gas can be removed in a similar manner. In more derived varieties of fish (the physoclisti) the connection to the digestive tract is lost. In early life stages, these fish must rise to the surface to fill up their swim bladders; in later stages, the pneumatic duct disappears, and the gas gland has to introduce gas (usually oxygen) to the bladder to increase its volume and thus increase buoyancy. In order to introduce gas into the bladder, the gas gland excretes lactic acid and produces carbon