The absolute and relative fecundity of freshwater, anadromous and marine fishes (102 species and subspecies from 33 families) and its dependence on body mass and growth rate were analyzed on the basis of published data. According to the spawning type all studied fishes were divided into species with short-term and single spawning and fishes with extended or long-term spawning. The equations of dependence of absolute fecundity (E) on body mass (W) were calculated: E = 1.033 W0.578 (the first group) and E = 0.792 W0.74 (the second group). If W < 177 g the equations don't differ significantly and one may use the equation E = 1.34(-0.742) for both groups. The body mass of females at age of maturity expressed as a portion of maximal definitive body mass equals 0.22 +/- 0.044 for many different species with 0.95 probability. The relative fecundity (a1) of some species negatively correlates with maximal body mass of adult individuals (Wmax). This dependence is expressed by equations: a1 = 3.033 Wmax-0.549 (for the first group) and a1 = 1.726 Wmax-0.351 (for the second group). Value of ratio Wov/W of different fish species changes irregularly from 0.054 to 0.32 and its average is 0.150 +/- 0.012 for the first group and 0.156 +/- 0.007 for the second one. In such a way, single reproduction effort of fishes is approximately 0.15. Comparison of data on Pisces, Crustacea, Amphibia, Reptilia, and Mammalia revealed that reproduction effort of different aquatic and terrestrial invertebrates and vertebrates varies within rather narrow limits (from 0.05 to 0.44). Average values of this index varies even less--from 0.097 to 0.238, on average 0.162, i.e. approximately 15-18% of animals' body mass falls on their reproduction constituent.
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