A GENERALIZED TARGET STRENGTH MODEL FOR EUPHAUSIIDS, WITH APPLICATIONS TO OTHER ZOOPLANKTON - COMMENTS

A major premise upon which this paper by Macaulay was written is flawe d as is the formulation (both conceptually and mathematically) of the scattering models. The formulation is actually an assemblage and adapt ation of previously published approximate solutions rather than a gene ralization. The physics of the scattering is blurred through a multitu de of empirical parameters. In order for this new ''generalized'' mode l to fit the data, the animals are required to change shape as the aco ustic frequency changes (for any animal of fixed size, it is required to be a sphere at low frequencies, prolate spheroid at intermediate fr equencies, and bent cylinder at high frequencies). The scattering mode ls, as presented, are not only physically incorrect, but in two cases are not even dimensionally correct (terms that are dimensionless are a dded to terms of dimension area). These and other errors are listed in several categories and commented upon with references given. (C) 1995 Acoustical Society of America.