North American Recent Soft-Shelled Turtles (Family Trionychidae)Webb, Robert G. (Robert Gravem)
Science
North American Recent Soft-Shelled Turtles (Family Trionychidae)
Webb, Robert G. (Robert Gravem)
Soft-shelled turtles
Several authors have mentioned softshells as a food item much sought
after by man. The commercial value of these turtles has been
summarized by Clark and Southall (1920:15-16). Softshells are consumed
in quantity only in small towns near the place of capture. They are
found only occasionally in the markets of large cities because the
turtles are little known and the palatability of their flesh is
unappreciated. Also, they do not stand shipment so well as other
turtles, and they are "not so meaty as the snapper; so there is more
waste" (Clark and Southall, _loc. cit._). Little and Keller (1937:221)
reported living individuals for sale at the market in Ciudad Juarez,
Chihuahua; however my inquiry at markets in Juarez in the summer of
1959 disclosed no evidence of recent sale of soft-shelled turtles. In
the southeastern United States the demand is perhaps greater than in
other regions. I have noted softshells in the market at New Orleans,
and Oliver (1955:19) has mentioned the sale of "some 146,600 pounds"
in one recent year in Florida. Over most of their range, however,
there probably is no general demand for softshells and no special
efforts are made to capture them. Softshells have been raised
successfully on "turtle farms" in Japan (Mitsukuri, 1905). True
(1893:152) wrote that "The eggs also are considered very excellent."
Softshells generally are condemned by fishermen because of the
mistaken belief that they are detrimental to fish populations. Food of
softshells is principally crawfish and insects. Fish comprise a small
proportion of the diet (frequency 1.9% in Michigan, Lagler, 1943: Tab.
9). Most of the fishes eaten seem to be small minnows. Probably fish
would comprise a larger percentage of the diet if they could be
caught. I doubt that a softshell can pursue and capture a healthy fish
in natural waters. Recently dead fish are eaten and perhaps fish eggs,
and senile and decrepit fishes. There is no evidence that soft-shelled
turtles are active predators on any kind of fish. Of course in
congested areas such as ponds of fish hatcheries, it is desirable to
eliminate the turtles. The known food habits of soft-shelled turtles
suggest that they compete with game fishes for food, but there is no
information on the intensity of competition (Lagler, _op. cit._:305).
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