Effect of bottom type on catch rates of North Sea cod (Gadus morhua) in surveys with commercial fishing vessels

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Seven surveys with commercial fishing vessels were conducted during a collaborative fishermen-scientist project on the distribution of cod in the north-eastern North Sea between June 2006 and June 2008. A flyshooter, a trawler and a gillnetter participated in this study. In general, catch rates were substantially higher on gravel or stone bottom and at ship wrecks than on sand bottom. The difference in the catch rates between the two bottom categories at paired stations within a short distance was highly significant for all the three fishing methods. Similarly, average CPUE for most surveys was several times higher on rough than on smooth bottom. These differences were highly significant for early autumn surveys conducted with the flyshooter and trawler and all gillnet surveys, the summer surveys for the flyshooter and the gillnetter, but not for the winter surveys with the trawler and the flyshooter. The latter suggest that bottom type preference may change with season, e.g. with respect to spawning migrations in winter and in relation with changes in the availability of food during spring and summer.
Original languageEnglish
JournalFisheries Research
Volume96
Issue number2-3
Pages (from-to)244-251
ISSN0165-7836
DOIs
Publication statusPublished - 2009

Keywords

  • Habitat preference
  • Commercial CPUE
  • Bottom type
  • North Sea
  • Cod

Cite this

@article{f6bbaddebfab45f5beb58a6475fc725c,
title = "Effect of bottom type on catch rates of North Sea cod (Gadus morhua) in surveys with commercial fishing vessels",
abstract = "Seven surveys with commercial fishing vessels were conducted during a collaborative fishermen-scientist project on the distribution of cod in the north-eastern North Sea between June 2006 and June 2008. A flyshooter, a trawler and a gillnetter participated in this study. In general, catch rates were substantially higher on gravel or stone bottom and at ship wrecks than on sand bottom. The difference in the catch rates between the two bottom categories at paired stations within a short distance was highly significant for all the three fishing methods. Similarly, average CPUE for most surveys was several times higher on rough than on smooth bottom. These differences were highly significant for early autumn surveys conducted with the flyshooter and trawler and all gillnet surveys, the summer surveys for the flyshooter and the gillnetter, but not for the winter surveys with the trawler and the flyshooter. The latter suggest that bottom type preference may change with season, e.g. with respect to spawning migrations in winter and in relation with changes in the availability of food during spring and summer.",
keywords = "Habitat preference, Commercial CPUE, Bottom type, North Sea, Cod",
author = "Kai Wieland and Pedersen, {Eva Maria} and Olesen, {Hans Jakob} and Jan Beyer",
year = "2009",
doi = "10.1016/j.fishres.2008.11.010",
language = "English",
volume = "96",
pages = "244--251",
journal = "Fisheries Research",
issn = "0165-7836",
publisher = "Elsevier",
number = "2-3",

}

Effect of bottom type on catch rates of North Sea cod (Gadus morhua) in surveys with commercial fishing vessels. / Wieland, Kai; Pedersen, Eva Maria; Olesen, Hans Jakob; Beyer, Jan.

In: Fisheries Research, Vol. 96, No. 2-3, 2009, p. 244-251.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Effect of bottom type on catch rates of North Sea cod (Gadus morhua) in surveys with commercial fishing vessels

AU - Wieland, Kai

AU - Pedersen, Eva Maria

AU - Olesen, Hans Jakob

AU - Beyer, Jan

PY - 2009

Y1 - 2009

N2 - Seven surveys with commercial fishing vessels were conducted during a collaborative fishermen-scientist project on the distribution of cod in the north-eastern North Sea between June 2006 and June 2008. A flyshooter, a trawler and a gillnetter participated in this study. In general, catch rates were substantially higher on gravel or stone bottom and at ship wrecks than on sand bottom. The difference in the catch rates between the two bottom categories at paired stations within a short distance was highly significant for all the three fishing methods. Similarly, average CPUE for most surveys was several times higher on rough than on smooth bottom. These differences were highly significant for early autumn surveys conducted with the flyshooter and trawler and all gillnet surveys, the summer surveys for the flyshooter and the gillnetter, but not for the winter surveys with the trawler and the flyshooter. The latter suggest that bottom type preference may change with season, e.g. with respect to spawning migrations in winter and in relation with changes in the availability of food during spring and summer.

AB - Seven surveys with commercial fishing vessels were conducted during a collaborative fishermen-scientist project on the distribution of cod in the north-eastern North Sea between June 2006 and June 2008. A flyshooter, a trawler and a gillnetter participated in this study. In general, catch rates were substantially higher on gravel or stone bottom and at ship wrecks than on sand bottom. The difference in the catch rates between the two bottom categories at paired stations within a short distance was highly significant for all the three fishing methods. Similarly, average CPUE for most surveys was several times higher on rough than on smooth bottom. These differences were highly significant for early autumn surveys conducted with the flyshooter and trawler and all gillnet surveys, the summer surveys for the flyshooter and the gillnetter, but not for the winter surveys with the trawler and the flyshooter. The latter suggest that bottom type preference may change with season, e.g. with respect to spawning migrations in winter and in relation with changes in the availability of food during spring and summer.

KW - Habitat preference

KW - Commercial CPUE

KW - Bottom type

KW - North Sea

KW - Cod

U2 - 10.1016/j.fishres.2008.11.010

DO - 10.1016/j.fishres.2008.11.010

M3 - Journal article

VL - 96

SP - 244

EP - 251

JO - Fisheries Research

JF - Fisheries Research

SN - 0165-7836

IS - 2-3

ER -