Acoustic survey in fishing

Acoustic survey in fishing is one of the research methods that can detect the presence of acoustic transducers . For example, Many pelagic fisheries are very Generally scattered over a broad ocean and difficulty to detect. Thus, the survey vessel with acoustic detector emits sound waves to estimate the density of plankton and fish shoal . Generally speaking , the transducer is one of the following, which is linked to an echo sounder in the vessel which records the shoals of fish as “marks” on a screen or paper trace. Then the density and number of marks are converted into biomass. [1]


One real case of acoustic survey was conducted in July 1993 to review pre-spawning concentration of autumn-spawning herring using a Simrad EK 500 38-kHz sounder and echo-integrator in the fisheries research vessel in Scotia FRV. The survey was based on the limit of herring densities in previous years. A transect spacing of 15 nautical miles (17.3 miles) was used. Data from the echo integrator were summed over at 15-min period (2.5n miles at 10 knots, 1 knot = 1.852 km / h). The echo sound provided approximately 2.5 * 10,000,000 measurements of fish population during acoustic survey of herring population. [2]

Acoustic survey est used for land animals like bats for bat habitat management. Acoustic survey is conducted to find out the occurrence and activity patterns [3] and other emerging features. Acoustic survey has an advantage since it can be carried out in a larger area. [4] Despite the drawbacks, acoustic survey remains an important tool to address many bat research monitoring.

References

  1. Jump up^ Marine Institute 2011 ArchivedOctober 4, 2011, at theWayback Machine.
  2. Jump up^ Christos D Maravelias, David G Reid, John E. Simmonds, John Haralabous (2011), “Spatial analysis and mapping of acoustic survey data in the presence of high local variability: geostatistical application to North Sea Herring”, Canadian Journal of Fisheries and Aquatic Sciences, 1996, 53: (7) 1497-1505, 10.1139 / f96-079
  3. Jump up^ Gehrt SD, and JE Chelsvig Species Specific Patterns of Activity in an Urban Landscape. Ecological Applications 14: 625-635
  4. Jump up^ Barclay, RMR 1999. Bats are not birds-a cautionary note on using echolocation calls to identify bats: Journal of Mammalogy 80: 290-296

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