An Atlantic herring ( Clupea harengus ) size selection model for experimental gill nets used in the Sound (ICES Subdivision 23)

S. Poulsen, J. Rasmus Nielsen, René Holst, Karl-Johan Stæhr

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Size selection investigations were performed in the Sound with experimental, multipanel gill nets equipped with a broad range of mesh sizes targeting Atlantic herring (Clupea harengus). Each of the 20 experimental fishery surveys covered the central Sound from Helsingor-Helsingborg (north) to Drogden-Klagshamn (south) during the autumn, winter, and spring periods from 1993 to 1998. There was high variability in catch sizes both between and within surveys. The overall best fits, in terms of minimum total deviance across all sets, were achieved using a unimodal normal scale model. Almost all surveys showed high between-set variation, which was accounted for when estimating the mean selectivity curves using a random effects model. The selectivity curves fitted to individual sets were compared with those fitted to the combined data sets. It was demonstrated that analysing pooled data sets resulted in overdispersion and bias in the selection parameters. Irregular time series of the estimates of the selectivity parameters in the investigation period indicated negative autocorrelation with a seasonal pattern.
Original languageEnglish
JournalCanadian Journal of Fisheries and Aquatic Sciences
Volume57
Issue number8
Pages (from-to)1551-1561
ISSN0706-652X
DOIs
Publication statusPublished - 2000

Cite this

@article{90ddf0b5c31f4729ab6ecc3c4e057912,
title = "An Atlantic herring ( Clupea harengus ) size selection model for experimental gill nets used in the Sound (ICES Subdivision 23)",
abstract = "Size selection investigations were performed in the Sound with experimental, multipanel gill nets equipped with a broad range of mesh sizes targeting Atlantic herring (Clupea harengus). Each of the 20 experimental fishery surveys covered the central Sound from Helsingor-Helsingborg (north) to Drogden-Klagshamn (south) during the autumn, winter, and spring periods from 1993 to 1998. There was high variability in catch sizes both between and within surveys. The overall best fits, in terms of minimum total deviance across all sets, were achieved using a unimodal normal scale model. Almost all surveys showed high between-set variation, which was accounted for when estimating the mean selectivity curves using a random effects model. The selectivity curves fitted to individual sets were compared with those fitted to the combined data sets. It was demonstrated that analysing pooled data sets resulted in overdispersion and bias in the selection parameters. Irregular time series of the estimates of the selectivity parameters in the investigation period indicated negative autocorrelation with a seasonal pattern.",
keywords = "Fiskeriteknologi",
author = "S. Poulsen and Nielsen, {J. Rasmus} and Ren{\'e} Holst and Karl-Johan St{\ae}hr",
year = "2000",
doi = "10.1139/cjfas-57-8-1551",
language = "English",
volume = "57",
pages = "1551--1561",
journal = "Canadian Journal of Fisheries and Aquatic Sciences",
issn = "0706-652X",
publisher = "N R C Research Press",
number = "8",

}

An Atlantic herring ( Clupea harengus ) size selection model for experimental gill nets used in the Sound (ICES Subdivision 23). / Poulsen, S.; Nielsen, J. Rasmus; Holst, René; Stæhr, Karl-Johan.

In: Canadian Journal of Fisheries and Aquatic Sciences, Vol. 57, No. 8, 2000, p. 1551-1561.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - An Atlantic herring ( Clupea harengus ) size selection model for experimental gill nets used in the Sound (ICES Subdivision 23)

AU - Poulsen, S.

AU - Nielsen, J. Rasmus

AU - Holst, René

AU - Stæhr, Karl-Johan

PY - 2000

Y1 - 2000

N2 - Size selection investigations were performed in the Sound with experimental, multipanel gill nets equipped with a broad range of mesh sizes targeting Atlantic herring (Clupea harengus). Each of the 20 experimental fishery surveys covered the central Sound from Helsingor-Helsingborg (north) to Drogden-Klagshamn (south) during the autumn, winter, and spring periods from 1993 to 1998. There was high variability in catch sizes both between and within surveys. The overall best fits, in terms of minimum total deviance across all sets, were achieved using a unimodal normal scale model. Almost all surveys showed high between-set variation, which was accounted for when estimating the mean selectivity curves using a random effects model. The selectivity curves fitted to individual sets were compared with those fitted to the combined data sets. It was demonstrated that analysing pooled data sets resulted in overdispersion and bias in the selection parameters. Irregular time series of the estimates of the selectivity parameters in the investigation period indicated negative autocorrelation with a seasonal pattern.

AB - Size selection investigations were performed in the Sound with experimental, multipanel gill nets equipped with a broad range of mesh sizes targeting Atlantic herring (Clupea harengus). Each of the 20 experimental fishery surveys covered the central Sound from Helsingor-Helsingborg (north) to Drogden-Klagshamn (south) during the autumn, winter, and spring periods from 1993 to 1998. There was high variability in catch sizes both between and within surveys. The overall best fits, in terms of minimum total deviance across all sets, were achieved using a unimodal normal scale model. Almost all surveys showed high between-set variation, which was accounted for when estimating the mean selectivity curves using a random effects model. The selectivity curves fitted to individual sets were compared with those fitted to the combined data sets. It was demonstrated that analysing pooled data sets resulted in overdispersion and bias in the selection parameters. Irregular time series of the estimates of the selectivity parameters in the investigation period indicated negative autocorrelation with a seasonal pattern.

KW - Fiskeriteknologi

U2 - 10.1139/cjfas-57-8-1551

DO - 10.1139/cjfas-57-8-1551

M3 - Journal article

VL - 57

SP - 1551

EP - 1561

JO - Canadian Journal of Fisheries and Aquatic Sciences

JF - Canadian Journal of Fisheries and Aquatic Sciences

SN - 0706-652X

IS - 8

ER -