Using paired visual and passive acoustic surveys to estimate passive acoustic detection parameters for harbor porpoise abundance estimates

2017 ◽  
Vol 141 (1) ◽  
pp. 219-230
Author(s):  
Eiren K. Jacobson ◽  
Karin A. Forney ◽  
Jay Barlow
Keyword(s):  
Acoustic Detection ◽  
Harbor Porpoise ◽  
Abundance Estimates ◽  
Acoustic Surveys ◽  
Passive Acoustic

Fish Bioacoustics and Behavior: Passive Acoustic Detection and the Application of a Closed-Circuit Rebreather for Field Study

2001 ◽  
Vol 35 (2) ◽  
pp. 19-28 ◽  
Author(s):  
Phillip S. Lobel
Keyword(s):  
Behavioral Ecology ◽  
Daily Basis ◽  
Open Circuit ◽  
Acoustic Detection ◽  
Ecological Processes ◽  
Detection Technology ◽  
Scientific Goal ◽  
Species Specific ◽  
Passive Acoustic ◽  
And Behavior

The simple thesis of this paper is that using rebreathers to study fish behavioral ecology, especially bioacoustics, is well worth the expense and additional training required. The scientific goal of my bioacoustic research is to determine which fishes produce species-specific sound patterns exclusively with explicit acts of courtship and mating. This provides scientific insight into evolutionary and ecological processes and also provides data necessary to develop the passive acoustic detection technology for monitoring fish reproduction. When used on a daily basis, rebreathers, in my experience, are economical and as practical as open circuit scuba. This is based both on the costs of diving as well as the efficiency of gathering useful data. The use of open circuit SCUBA while conducting acoustic recordings results in a loss of at least 40% of the data due to the bubble noise from a divers breathing. Rebreathers also provide extended bottom time, especially in shallow water, which enhances a diver's ability to observe fish and gather acoustic-behavioral data.

Jellyfish distribution and abundance in relation to the physical habitat of Jellyfish Lake, Palau

2018 ◽  
Vol 34 (1) ◽  
pp. 17-31 ◽  
Author(s):  
Megan A. Cimino ◽  
Sharon Patris ◽  
Gerda Ucharm ◽  
Lori J. Bell ◽  
Eric Terrill
Keyword(s):  
Autonomous Underwater Vehicle ◽  
Size Fraction ◽  
Underwater Vehicle ◽  
Habitat Associations ◽  
Physical Habitat ◽  
Uv Damage ◽  
Tourist Destination ◽  
Novel Approach ◽  
Abundance Estimates ◽  
Acoustic Surveys

Abstract:Animals often select for habitats that increase their chance of survival by balancing the need to acquire food, reproduce and avoid predation. Perennial blooms of golden jellyfish (Mastigias papua etpisoni) are present in Jellyfish Lake, Palau, a popular tourist destination. Based on the species’ economic importance and unusual behavioural complexity, increased understanding of jellyfish habitat selection is necessary. We used a novel approach, a REMUS autonomous underwater vehicle, to quantify jellyfish distribution, abundance and habitat, and compared these findings to traditional methods. Midday acoustic surveys showed jellyfish distribution was patchy and the population resided mainly on the eastern side of the lake, as it is known that jellyfish migrate eastward towards the sun. Highest vertical densities of jellyfish were at 6–7 m, potentially to mitigate UV damage or photoinhibition of their photosymbionts, suggesting a coupling exists between their vertical distribution and water properties. Abundance estimates of jellyfish were ~2.75 and ~7.1 million (~2 million excluding bell diameters <1 cm) from acoustic and net samples, suggesting the methodology employed underestimated the population's smaller size fraction and non-synoptic surveys could impact estimates due to unresolved patchiness. Our approach could investigate population dynamics, behaviour or habitat associations on fine scales.

A multifrequency method to classify and evaluate fisheries acoustics data

2006 ◽  
Vol 63 (10) ◽  
pp. 2225-2235 ◽  
Author(s):  
J Michael Jech ◽  
William L Michaels
Keyword(s):  
Clupea Harengus ◽  
Biological Information ◽  
Classification Algorithms ◽  
Atlantic Herring ◽  
Population Abundance ◽  
Acoustic Data ◽  
Video Images ◽  
Abundance Estimates ◽  
Fisheries Acoustics ◽  
Acoustic Surveys

Acoustic surveys have been conducted on Georges Bank from 1998 to present to estimate Atlantic herring (Clupea harengus) population abundance. Acoustic data were collected with a 12 or 18, 38, and 120 kHz Simrad EK500 scientific echo sounder. A pelagic trawl and underwater video images were used to collect biological information and to verify the species composition of acoustic backscatter. A multifrequency classification method was developed to improve the efficiency and accuracy of classifying species from acoustic echograms. In this method, a volume backscatter (Sv) threshold was applied equivalently to all echograms, and then a composite echogram was created based on which frequencies had Sv greater than or less than the Sv threshold. The results of this method were compared with the standard method of visually scrutinizing regions, and metrics were developed to evaluate the accuracy of classification algorithms relative to current methods, as well as to assess the effects of classification methods on population abundance estimates. In general, this method matched visually scrutinized Atlantic herring regions, but with consistent biases in classifying 38 kHz backscatter. The metrics highlighted spatial and temporal changes in the acoustic landscape, which may be indicative of intra- and inter-annual biological changes.

Passive Acoustic Detection and Monitoring of Schools of Herring

2008 ◽  
Vol 123 (5) ◽  
pp. 3621-3621
Author(s):  
Thomas R. Hahn ◽  
Gary L. Thomas
Keyword(s):  
Acoustic Detection ◽  
Passive Acoustic

Passive acoustic tracking of echolocating harbor porpoise (Phocoena phocoena). I. Fisheries management requirements and biological basis

1997 ◽  
Vol 102 (5) ◽  
pp. 3212-3212
Author(s):  
David C. Potter ◽  
Janeen M. Quintal ◽  
James H. Miller ◽  
Robert Gampert ◽  
Khosrow Lashkari
Keyword(s):  
Fisheries Management ◽  
Phocoena Phocoena ◽  
Harbor Porpoise ◽  
Acoustic Tracking ◽  
Biological Basis ◽  
Passive Acoustic
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