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Table 3. Stable nitrogen isotope ratios (d15N 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 d15N of the diets is indicated in parentheses.
Table 3

1 Values are means of four replicates ± SD.

2 Clarias (stocked to control tilapia reproduction) samples were available for isotope analysis only.

a,b,c Means for each month in columns with different letters are significantly different (P < 0.05) according to Fisher's Least Significant Difference test.