Standardizing the Southern Gulf of St. Lawrence Bottom-trawl Survey Time Series : Adjusting for Changes in Research Vessel, Gear and Survey Protocol PDF Download
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Author: Canada. Department of Fisheries and Oceans
Publisher: Moncton, N.B. : Fisheries and Oceans
ISBN:
Category :
Languages : en
Pages : 95
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Book Description
Author: Canada. Department of Fisheries and Oceans
Publisher: Moncton, N.B. : Fisheries and Oceans
ISBN:
Category :
Languages : en
Pages : 95
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Book Description
Author: G. Mark Fowler
Publisher:
ISBN:
Category : Calibration
Languages : en
Pages : 34
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Book Description
Adjustments to calibrate fish and invertebrate abundance estimates between two research survey vessels were determined using mixed-effects and fixed-effects modelling. The fixed-effects model assumes equal probability of a fish being available for capture between the two vessels for a given paired tow set, while the mixed-effects model assumes equal probability over the population of sets, including an estimate of within-set variability as random error. The mixed-effects approach appeared superior to the fixed-effects approach, being better able to resolve the high variability between sets characteristic of the stratified-random survey design in which the calibrartion experiment was conducted. Differences in catchability with length of animals was pervasive, the greatest differences in catchability between vessels being associated with the smallest animals. The influence of length on catchability was best portrayed as a curilinear relationship, as catchability tended to plateau for animals over about 26cm. For some species catchabilities between vessles differed according to the time of day and depth of a tow, though in most cases the differences were of fairly small magnitude.
Author: Hugues Pascal Benoît
Publisher:
ISBN:
Category : Fish stock assessment
Languages : en
Pages : 127
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Book Description
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 34
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Book Description
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 546
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Book Description
Author: Luc Savoie
Publisher:
ISBN:
Category : Trawls and trawling
Languages : en
Pages :
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Book Description
Author: Philip J. Politis
Publisher:
ISBN:
Category : Dredging (Fisheries)
Languages : en
Pages : 144
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Book Description
"This document describes the standard operational protocols for conducting the Northeast Fisheries Science Center spring and autumn Multispecies Bottom Trawl Survey aboard the NOAA Ship Henry B. Bigelow. This manual documents current survey protocols and standard sampling gear implemented in spring 2009 after the 2008 survey calibration with the NOAA Ship Albatross IV and the NOAA Ship Henry B. Bigelow. It is intended to serve as a reference manual to ensure survey standardization and aid in the training of new personnel"--Executive summary.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Book Description
This paper evaluates the potential of a juvenile cod survey as an independent index of pre-recruiting year class strength of southern Gulf of St. Lawrence cod. The evaluation is based on five surveys conducted with a bottom trawl in the Shediac Valley area of the southern Gulf in the summers of 1990 to 1994. Numbers per tow at age for ages 1 to 9 were obtained for all five years of the survey. Two types of analyses were used to attempt to evaluate the utility of the surveys as an index of year class strength: correlation analysis and application of two multiplicative models, an age & year class model and an age, year class, stratum, and age-stratum interaction model.
Author: Neil W. Bagley
Publisher:
ISBN: 9781776650170
Category : Fish surveys
Languages : en
Pages :
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Book Description
Author: National Research Council Canada
Publisher: NRC Research Press
ISBN: 9780660172217
Category : Science
Languages : en
Pages : 484
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Book Description
Proceedings of a symposium that focused on new, innovative evaluation of the implications and needs for changing management approaches and demands in invertebrate fishery science. Species covered in the presentations include crustaceans, gastropods, echinoderms, and bivalves. Presentations are organized in the following subject areas: assessment of abundance and related parameters; growth, mortality, and yield per recruit; spatial pattern and its implications; the fishing process; population dynamics; the fishery as a selective force; invertebrate fisheries management; and regional perspectives from the north Pacific. The proceedings conclude with a symposium overview.
