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Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

... mobile hydroacoustic surveys coupled with the geostatistical probability mapping [provide] an objective, repeatable measure of the spatial extent of the [fish] aggregation. Estimates such as these are valuable when establishing boundaries for reserves or area closures during spawning seasons, and in estimating overall fish abundance ...  2, record 1, English, - mobile%20hydroacoustic%20sampling

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

La répartition spatiale des [poissons] géniteurs dans la [rivière] Rupert a été déterminée au moyen d'un échantillonnage hydroacoustique mobile […] juste avant la fraie. La frayère […] a été divisée en trois secteurs d'inventaire […]  1, record 1, French, - %C3%A9chantillonnage%20hydroacoustique%20mobile

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 CONT

An acoustic survey is a method of gathering information on the abundance of a fish species using echo sounders. Sound is a form of energy which travels farther and faster underwater than in the air. So using the distance a sound travels and the record it makes when it bounces off of something underwater can tell a researcher a good deal about the creatures passing by underwater.  3, record 2, English, - hydroacoustic%20survey

Record number: 2, Textual support number: 1 OBS

In an acoustic survey, a transducer emits a pulse of sound. The transducer can be either fixed or mounted on a moving vessel. The sound moves through the water until it bumps into something, such as a fish, and part of its energy is reflected back to the transducer. Another device, called an echo sounder, amplifies the returned energy and sends it to a recorder where it registers as a mark.  3, record 2, English, - hydroacoustic%20survey

Record 2,  Textual support,  French

Record 2,  Textual support,  Spanish