Relative infaunal bivalve density assessed from split beam echosounder angular information

Oceanologia

Juan Freire¹  Daniel Rodríguez-Pérez²  Noela Sánchez-Carnero³  Victor Espinosa⁴  Nuria Zaragozá⁴ 

[1] Barrabés Next, C. Serrano 16-1, 28001 Madrid, Spain;Departamento de Física Matemática y de Fluidos, Facultad de Ciencias, UNED, C/Paseo de la Senda del Rey, 28040 Madrid, Spain;Grupo de Oceanografía Física, Universidade de Vigo, Campus Lagoas-Marcosende, 36200 Vigo,Spain;Institut d’Investigació per a la Gestió Integrada de Zones Costaneres, C/Paranimf 1, 46730 Grau de Gandia, Spain;

关键词: Shellfish beds;    Stock assessment;    Split-beam echosounder;    Angular information;    Haralick textural features;    Benthic habitat mapping;   

DOI  :  10.5697/oc.55-3.497

来源: DOAJ

【 摘 要 】

Management of shellfish resources requires a spatial approach where mapping is a key tool. Acoustic techniques have been rarely used to map infaunal organisms with a patchy distribution. We propose and test the use of split-beam echosounder angular information to assess razor shell presence and relative density. Our statistical approach combines textural analysis of angular echograms, standard unsupervised multivariate methods and hierarchical classification through dendrograms to identify groups of locations with similar clam densities. The statistical analyses show that the classification is consistent with groundtruthing data and that results are insensitive to boat motion or seabed granulometry. The method developed here constitutes a promising tool for assessing the relative density of razor clam grounds.

【 授权许可】

Unknown