The empirical relationships linking fish length and target strength for geometric region scattering, which have been developed by Love [J. Acoust. Soc. Am. 62, 1397–1403 (1977)], are shown to apply in the case of peak dorsal values, to some other marine organisms. Peak dorsal target strengths for squid, crab and penaeid prawns lie within 6 dB of the appropriate predictions due to Love. Some zooplankton values are within similar limits provided insonifying frequencies are sufficiently high to ensure that geometric region interactions occur. The target strength data reviewed show little overall frequency dependence in the geometric region, as would be expected if the scatterers were modeled as finite cylinders.