by Dept. of Fisheries and Oceans, Institute of Ocean Sciences in Sidney, B.C .
Written in English
Bibliography: p. 47-49.
|Statement||by P.G. Simpkin of Geomarine Associates Ltd.|
|Series||Contractor report series -- 80-7., Contractor report series (Institute of Ocean Sciences, Patricia Bay) -- no. 80-7.|
|The Physical Object|
|Pagination||60 p. :|
|Number of Pages||60|
Acoustic densities and target strength of juvenile silverfish were so low that they were, at times, similar to the acoustic noise level for the kHz echosounder. Accurate estimates of silverfish biomass are strongly dependent on good estimates of acoustic target strength (TS).Cited by: Use of Acoustic Observations in Assessment of Deep Sea Fish: Case Study Greater Silver Smelt (Argentina silus) in Norwegian Water Elvar H. Hallfredsson Alf Harbitz. As target strength, and variability in target strength of age-0 polar cod were not known, we used a minimum target strength of - 90 dB for single-target detections. Target strength at 38 kHz (filled asterisks) and kHz (filled squares) of the calibration target versus depth of the vehicle. Tungsten-carbide sphere of diameter mm (WC ) with nominal target strengths TS nom,38= − dB re 1 m 2 at 38 kHz and TS nom,= − dB re 1 m 2 at kHz, for a sound velocity of m/s (Foote Cited by:
We found that the fish kills represented between 7 and 18% of the total local population (~ million) that were present at the time. Significant changes in target strength distributions during the study suggest that the size classes of menhaden present in the estuary change as fish grow or migrate in and out of the by: 3. target strength of large underwater objects with the use of boundary element methods, fast multipole methods as well as a ray-based algorithm, are all presented here and the results of the calculations of several test objects are shown. INTRODUCTION. One application in the broad field of hydroacoustics is the search for underwater objectsFile Size: 2MB. English IV CP ADV Midterm Review McKeithan Learn with flashcards, games, and more — for free. Start studying Mus11 Chapter Learn vocabulary, terms, and more with flashcards, games, and other study tools.
In this study, a PAM recorder was deployed on an oceanographic mooring in western Fram Strait (78°50'N, 5°W) to record the acoustic presence of narwhals (Monodon monoceros) over a 3-yr period. A commercially available fisheries sonar was mounted on an icebreaker and evaluated during an environmental baseline study in the Canadian Beaufort Sea, to determine the applicability of active. Autonomous passive acoustic recorders were deployed to record sounds of bowhead whales (Balaena mysticetus) in the southeast Beaufort Sea for periods of 30–55 days during the late summer, open-water seasons of – Recordings were made in three areas licensed for hydrocarbon exploration, spanning the continental slope and adjacent outer shelf, and in a shallow Cited by: 4. Autonomous passive acoustic recorders were deployed to record sounds of bowhead whales (Balaena mysticetus) in the southeast Beaufort Sea for periods of 30–55 days during the late summer, open.