i
On the development of acoustic descriptors for semi-demersal fish identification to support monitoring stocks
-
2021
-
Source: ICES Journal of Marine Science, 78(3), 1117-1130
[PDF-1.36 MB]
Details:
-
Journal Title:ICES Journal of Marine Science
-
Personal Author:
-
NOAA Program & Office:
-
Description:Despite worldwide economic importance of lutjanid snappers, there are critical data gaps hindering accurate abundance estimates of thesespecies, thereby impeding stock management efforts. Development of an active acoustics method could fill many of these data gaps, signifi-cantly benefiting stock assessment of snapper species that form typically mixed-species assemblages in non-trawlable regions. These methodsare well suited for resource surveys but require the ability to derive accurate size estimates from target strength (TS) and the separation ofechoes from species within the stock. This work evaluates the feasibility of active acoustics for surveying a Hawaiian bottomfish stock, referredto as the Deep-7 complex, consisting of six species of lutjanid snappers and a single grouper. Acoustic backscatter data and complementarymethodologies were used to model TS and develop acoustic descriptors such as aggregation shape, size, and density, individual swimming pat-tern, distance from bottom, and bottom depth for Deep-7 species. Paired observations ofin situTS and fork length (FL) gave an estimatedbulk relationship of 23.01log10(FL)–72.18. The success of 25 accuracy tests indicates the effectiveness of the developed echo allocationparameters. Preliminary results imply that acoustics could be successfully used to monitor Deep-7 with broader applicability upon adaptingmethodology to other regions.
-
Keywords:
-
Source:ICES Journal of Marine Science, 78(3), 1117-1130
-
DOI:
-
Document Type:
-
Rights Information:Public Domain
-
Compliance:Submitted
-
Main Document Checksum:
-
Download URL:
-
File Type:
