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Fig. 4. Relationship of muscle urea content with total methylamine (closed symbols,
solid line) or combined total of methylamine and ß-amino acid (open
symbols, broken line) content in marine (circles), euryhaline species in
freshwater (FW) (triangles) and freshwater elasmobranchs (squares). Values are
mean ± s.e.m. and N values are the same those for total
methylamine contents in Fig. 4. The regressions are statistically significant
(total methylamines, P<0.01; total methylamines plus ß-amino
acids, P<0.001).