SUMMARY
Fishery independent indices of spawning biomass of bluefin tuna in western North Atlantic Ocean are presented which utilize NOAA Fisheries ichthyoplankton survey data collected from 1977 through 2005 in the Gulf of Mexico. Indices were developed using similarly standardized data from which previous...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.574.9877 2023-05-15T17:33:07+02:00 SUMMARY G. Walter Ingram William J. Richards Gerald P. Scott Stephen C. Turner The Pennsylvania State University CiteSeerX Archives 1057 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.574.9877 http://www.iccat.int/Documents/CVSP/CV060_2007/no_4/cv060041057.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.574.9877 http://www.iccat.int/Documents/CVSP/CV060_2007/no_4/cv060041057.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.iccat.int/Documents/CVSP/CV060_2007/no_4/cv060041057.pdf text 1057 ftciteseerx 2016-01-08T12:42:50Z Fishery independent indices of spawning biomass of bluefin tuna in western North Atlantic Ocean are presented which utilize NOAA Fisheries ichthyoplankton survey data collected from 1977 through 2005 in the Gulf of Mexico. Indices were developed using similarly standardized data from which previous indices were developed (i.e. abundance of larvae with a first daily otolith increment formed per 100 m2 of water sampled). An index of larval abundance was developed using a delta-lognormal model, which is a mathematical combination of yearly catch estimates from two distinct generalized linear models: a binomial model which describes the proportion of positive catch values and a lognormal model which describes the variability in nonzero catch data. Covariates, including surface temperature, water depth, time of day, time of month, area sampled and year, were tested for inclusion in both submodels. Due to the large frequency of zero catches during ichthyoplankton surveys, especially in later years, the binomial portion of the delta-lognormal approach was replaced with a zero-inflated binomial model and was considered a more appropriate method to model these data. The results of these two approaches were compared with one another and with other indices of larval abundance Text North Atlantic Unknown |
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description |
Fishery independent indices of spawning biomass of bluefin tuna in western North Atlantic Ocean are presented which utilize NOAA Fisheries ichthyoplankton survey data collected from 1977 through 2005 in the Gulf of Mexico. Indices were developed using similarly standardized data from which previous indices were developed (i.e. abundance of larvae with a first daily otolith increment formed per 100 m2 of water sampled). An index of larval abundance was developed using a delta-lognormal model, which is a mathematical combination of yearly catch estimates from two distinct generalized linear models: a binomial model which describes the proportion of positive catch values and a lognormal model which describes the variability in nonzero catch data. Covariates, including surface temperature, water depth, time of day, time of month, area sampled and year, were tested for inclusion in both submodels. Due to the large frequency of zero catches during ichthyoplankton surveys, especially in later years, the binomial portion of the delta-lognormal approach was replaced with a zero-inflated binomial model and was considered a more appropriate method to model these data. The results of these two approaches were compared with one another and with other indices of larval abundance |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
G. Walter Ingram William J. Richards Gerald P. Scott Stephen C. Turner |
spellingShingle |
G. Walter Ingram William J. Richards Gerald P. Scott Stephen C. Turner SUMMARY |
author_facet |
G. Walter Ingram William J. Richards Gerald P. Scott Stephen C. Turner |
author_sort |
G. Walter Ingram |
title |
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1057 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.574.9877 http://www.iccat.int/Documents/CVSP/CV060_2007/no_4/cv060041057.pdf |
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North Atlantic |
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North Atlantic |
op_source |
http://www.iccat.int/Documents/CVSP/CV060_2007/no_4/cv060041057.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.574.9877 http://www.iccat.int/Documents/CVSP/CV060_2007/no_4/cv060041057.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766131517703061504 |