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A methodology is developed to measure ex situ ultrasonic velocity of submerged aquatic vegetation tissue, in particular, macroalgae, in a nondestructive and efficient manner. An entire thallus is submerged in artificial seawater-filled tank through which many ultrasonic pulse-echo measurements are recorded while thallus parts are randomly displaced. Average sound speed of tissue is estimated from normal fit to extracted travel times given measured total volume fraction of tissue and travel time in water alone. For species Ecklonia radiata the resulting values for sound speed 1573.4 ± 4.8 m s⁻¹ and adiabatic compressibility 3.134 ×10⁻¹⁰ ± 1.34 ×10⁻¹¹ Pa⁻¹ at 18 °C agree with more laborious and destructive methods.

Item Type:	Refereed Article
Keywords:	seaweed, Ecklonia radiata, ultrasound, compressibility, density
Research Division:	Biological Sciences
Research Group:	Ecology
Research Field:	Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:	Environment
Objective Group:	Ecosystem Assessment and Management
Objective Field:	Ecosystem Assessment and Management of Marine Environments
UTAS Author:	Randall, J (Ms Jo Randall)
ID Code:	102263
Year Published:	2015
Web of Science® Times Cited:	2
Deposited By:	IMAS Research and Education Centre
Deposited On:	2015-08-07
Last Modified:	2017-11-29
Downloads:	15 View Download Statistics