Stephen Jay Gould? George Lakoff? Delta Willis? Steven Pinker? Stephen Fry?
Question for Quote Investigator: A prominent scientist apparently made the following surprising pronouncement:
There is no such thing as a fish.
I do not recall the precise phrasing. Would you please explore the provenance and interpretation of this statement?
Reply from Quote Investigator: In 1981 paleontologist Stephen Jay Gould published a piece in “Natural History†magazine about cladistics which is a method for categorizing organisms based on common ancestry within a phylogenetic tree. A clade is a group of organisms which share a common ancestor. A cladogram is a tree diagram which represents the relationship between organisms.
In the following passage Gould referred to the English author Izaak Walton who wrote “The Compleat Angler†which is a famous book about fishing. Boldface added to excerpts by QI:1
Some of our most common and comforting groups no longer exist if classifications must be based on cladograms. With apologies to Mr. Walton and to so many coastal compatriots in New England, I regret to report that there is surely no such thing as a fish.
About 20,000 species of vertebrates have scales and fins and live in water, but they do not form a coherent cladistic group. Some—the lungfishes and the coelacanth in particular—are genealogically close to the creatures that crawled out on land to become amphibians, reptiles, birds, and mammals.
In the passage above Gould was explaining the implications of rigorous cladistics. However, his viewpoint was more nuanced. Gould supported the continued use of the word “fishâ€:
The cladogram of trout, lungfish, and elephant is undoubtedly true as an expression of branching order in time. But must classifications be based only on cladistic information? A coelacanth looks like a fish, tastes like a fish, acts like a fish, and therefore — in some legitimate sense beyond hidebound tradition — is a fish.
Below are additional selected citations in chronological order.
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