Acoustics is the primary means of long-range and wide-area sensing in the ocean due to the severe attenuation of electromagnetic waves in seawater. While it is known that densely packed fish groups can attenuate acoustic signals during long-range propagation in an ocean waveguide. previous experimental demonstrations have been restricted to single line transect measurements of either ... https://www.lockdownsecuritycanada.shop/product-category/adhesion-promoter/