Threonine

The threonine requirement values for fish are summarized in Table 23.10. The reported values range from 20 to 50 g kg-1 of dietary protein. It is difficult to offer any explanation for the lack of agreement in these requirement values. Additional research is needed to determine if this wide range of values represents true differences in the threonine requirements or just a difference in the techniques used to determine the requirement values.

DeLong et al. (1962) found the threonine requirement of chinook salmon to be the same when determined at rearing temperatures of 8 and 15°C. These findings were not expected since these workers had previously reported the protein requirement of chinook salmon to increase from 40 g kg-1 diet at 8°C to 55 g kg-1 diet at 15°C (DeLong et al., 1958).

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