The comparison of the new model with experimental data indicates that the model is most accurate for 

 fish in which s < 10 5 dyne/cm. Table II indicates that this includes physostomes up to at least 40 cm in 

 length. In addition, Appendix A indicates that small physoclists, 10 cm or less in length, are also included 

 in this group. Most of the fish found in deep scattering layers are smaller than 1 cm and none have the well 

 developed musculature of fish such as cod. Thus, it appears that the new model will be of considerable 

 value in studies of volume reverberation. Table II indicates that a value of ^ of approximately 200 poise is 

 appropriate for these studies. 



The variations in s and E, required to match the values calculated using the new model to the 

 experimental data for large physoclists indicate that the new model is not completely adequate for these 

 fish. Even so, the new model is still better than previous models and, as such, is of some value in studies of 

 resonance of large physoclists. Table II indicates that values of s = 10 6 dyne/cm and 10 3 poise < ^22x1 3 

 poise should give reasonable results for these studies. 



The new model introduces two new parameters. ^ and s. Few measurements of these parameters exist 

 and those that do vary widely. The accuracy of the new model could be determined with much more 

 confidence if better information on E, and s were available. In addition, the variations of swimbladder volume 

 with depth for different fish species are required for all models. Hence, further experiments to determine s. 

 E;, and swimbladder size and shape versus depth are recommended. This recommendation is made with 

 the realization that the complexities involved in these experiments will be significant. 



34 



