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Table 2. Stable carbon isotope ratios (d13C in ) of free-swimming tilapia in ponds, tilapia in cages in the same ponds, and plankton sampled in January, March, and May 2000 in Sagana, Kenya.1 The d13C of the diets is indicated in parentheses.
Table 2

1 Values are means of four replicates ± SD.

2 Clarias (stocked to control tilapia reproduction) samples were available for isotope analysis only in May. The mean d13C values for Clarias fed the test diet, pig finisher, and rice bran were ­17.0 ± 0.5, ­17.7 ± 0.8, and ­0.8 ± 0.6, respectively. Fish fed the rice bran had significantly more negative d13C than those fed the test diet or pig finisher.

a,b Means for each month in columns with different letters are significantly different