Volume backscattering strength samples and echograms (38 kHz) associated to small pelagic fish schools in the Gulf of California, Mexico

Date 2018
Author(s) Villalobos Héctor1, López-Serrano Antonio1, 2, Nevárez-Martínez Manuel O.3
Affiliation(s) 1 : Instituto Politécnico Nacional - CICIMAR. Av. I.P.N. s/n. Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23090, Mexico
2 : Universidad del Mar. Ciudad Universitaria. Puerto Ángel, Oaxaca 70902, Mexico
3 : Instituto Nacional de Pesca CRIP Unidad Guaymas, Calle Sur No. 20 Col. Cantera, Guaymas, Sonora 85400, Mexico
DOI 10.17882/53034
Publisher SEANOE
Abstract

Sv (dB re m-1) data samples taken from fish schools and their surrounding echoes in echograms associated to small pelagic fish in the Midriff Islands Region of the Gulf of California, Mexico. Acoustic data was acquired using a SIMRAD EK60 scientific echosounder with a 38 kHz split-beam transducer during May, 2013. Two files are provided, the data itself (Sv samples and three echograms) and the R-code needed to recreate figures and analysis in López-Serrano et al. 2017 (https://doi.org/10.1051/alr/2017048).

 

File description:


  • LopezSerrano_et_al_code.R

Ascii file (encoding UTF-8) with the R-code for re-creating the figures and analysis in the paper.


  • LopezSerrano_et_al_data.RData

Binary RData file with all the data used in the paper. Once loaded in R, it contains 4 objects: A table (data frame) and three echograms.

The first table contains nine columns:

id, x, y, pingNumber, pingTime, depth, Sv038, trawlNo, category

 

The echograms (eco.L04, eco.L14, eco.L17) are objects of class “echogram”, which are described below according to the R package echogram:

An object of class “echogram” (a list) with components:

depth : a vector of mean sample depth (in m) of length p.

Sv : a p by k matrix of sampled values, currently the mean volume backscattering strength (Sv, in dB).

pings : a k by four data frame with ping time, detected bottom depth, vessel speed and cummulated traveled distance.

Licence CC-BY-NC-SA
Utilisation In addition to cite this data set, it would be appreciated to also cite the work of López-Serrano et al. 2017 (https://doi.org/10.1051/alr/2017048) when using this data set. Data are published without any warranty, express or implied. The user assumes all risk arising from his/her use of data. Data are intended to be research-quality and include estimates of data quality and accuracy, but it is possible that these estimates or the data themselves contain errors. It is the sole responsibility of the user to assess if the data are appropriate for his/her use, and to interpret the data, data quality, and data accuracy accordingly. Authors welcome users to ask questions and report problems.
Data
File Size Format Processing Access
LopezSerrano_et_al_code.R 9 KB R Code Open access
LopezSerrano_et_al_data.RData 9 MB R Data Open access
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How to cite 

Villalobos Héctor, López-Serrano Antonio, Nevárez-Martínez Manuel O. (2018). Volume backscattering strength samples and echograms (38 kHz) associated to small pelagic fish schools in the Gulf of California, Mexico. SEANOE. https://doi.org/10.17882/53034


In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :


López-Serrano Antonio, Villalobos Héctor, Nevárez-Martínez Manuel O. (2018). A probabilistic procedure for estimating an optimal echo-integration threshold using the Expectation-Maximisation algorithm. Aquatic Living Resources, 31, 12-. https://doi.org/10.1051/alr/2017048