Also some pufferfish, including the chamaeleon puffer, contain saxitoxin, making their consumption hazardous. Other non-kosher fish include catfish, eels, Pacific cod, snake mackerels and puffer fish. Puffer fish also accumulate a structurally distinct toxin, tetrodotoxin. Discovery rig features sea horses, discus, triggerfish, a dogface puffer, a chuckwalla and more. The warning indicated that puffer fish toxin is 100 times more potent than cyanide. Within the puffer fish, TTX is found in the liver, gonads, intestines, and skin. This strain has been found exclusively in the toxin of the puffer fish, "Takifugu obscurus". The Vital Spark is a fictional Clyde puffer, created by Scottish writer Neil Munro. No new designs were needed as the perfect boat existed in a Clyde Puffer. He built a positive-pressure respirator that was later known in Hammersmith Hospital as the "Puffer". Other pioneering manufacturers were Alvin Puffer, Andrew Morse, Gustavus Dows, and James Tufts. This has been observed in captivity, and they are the only commonly captive-spawned puffer species. Thus a pattern consisting of only a puffer will grow arbitrarily large over time. Trevithick's early "puffer" engines discharged steam into the atmosphere. To prevent this, never remove a puffer from the water.