English: Tagging Strongylocentrotus franciscanus, in situ, off La Jolla, California, in January 1976. The tagging needle has penetrated the sea urchins test and depression of the actuating level will insert the tag. Note the tagged sea urchin in left foreground. Photo by Fred Fischer.

Title: California fish and game
Identifier: californiafishga65_1cali (find matches)
Year: [1] (s)
Authors: California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game
Subjects: Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons
Publisher: (San Francisco, etc. ) State of California, Resources Agency, Dept. of Fish and Game
Contributing Library: California Department of Fish and Game
Digitizing Sponsor: Internet Archive

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Text Appearing Before Image:
60 CALIFORNIA FISH AND GAME
Text Appearing After Image:
FIGURE 2. Tagging Strongylocentrotus franciscanus in situ. The tagging needle has penetrated the
sea urchins test and depression of the actuating level will insert the tag. Note the tagged
sea urchin in left foreground. Photo by Fred Fischer.

RESULTS AND DISCUSSION

We tagged 150 giant red sea urchins, Strongylocentrotus franciscanus, in
January 1976, off La Jolla, California (Figure 3). We employed a tagging rate of
one sea urchin every 2 min and at a tag cost of less than five cents per urchin.
Reobservation data were collected on 40 sea urchins. All data points in the graph
were derived from actual observations within the test area; hence some sea
urchins were not accounted for owing to movement from the test area or
unrecovered fatalities.
Test recalcification in the area of the tag was not observed in any of the sea
urchins tagged by this method. However, one sea urchin, tagged without an
identification disc, was removed months after tagging with no apparent ill ef-
fects. Many urchins showed signs of test decalcification or thinning in the vicinity

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