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Estimating relative abundance from catch and effort data, using neural networks (2021)

Maunder, Mark N. ; Hinton, Michael G.

Inter-American Tropical Tuna Commission | La Jolla, CA

In: http://aquaticcommons.org/id/eprint/6778 | 8 | 2011-09-29 13:08:27 | 6778 | Inter-American Tropical Tuna Commission

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Publication Date: 2021-06-26

Description: We develop and test a method to estimate relative abundance from catch and effort data usingneural networks. Most stock assessment models use time series of relative abundance as theirmajor source of information on abundance levels. These time series of relative abundance arefrequently derived from catch-per-unit-of-effort (CPUE) data, using general linearized models(GLMs). GLMs are used to attempt to remove variation in CPUE that is not related to the abundanceof the population. However, GLMs are restricted in the types of relationships between theCPUE and the explanatory variables. An alternative approach is to use structural models basedon scientific understanding to develop complex non-linear relationships between CPUE and theexplanatory variables. Unfortunately, the scientific understanding required to develop thesemodels may not be available. In contrast to structural models, neural networks uses the data toestimate the structure of the non-linear relationship between CPUE and the explanatory variables.Therefore neural networks may provide a better alternative when the structure of the relationshipis uncertain. We use simulated data based on a habitat based-method to test the neuralnetwork approach and to compare it to the GLM approach. Cross validation and simulation testsshow that the neural network performed better than nominal effort and the GLM approach. However,the improvement over GLMs is not substantial. We applied the neural network model toCPUE data for bigeye tuna (Thunnus obesus) in the Pacific Ocean.

Keywords: Fisheries

Repository Name: AquaDocs

Type: monograph

Format: application/pdf

Format: 22

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Statistics of the Eastern Pacific Ocean tuna fishery, 1979 to 1992 (2021)

Hinton, Michael G. ; Ver Steeg, Gayle

Inter-American Tropical Tuna Commission | La Jolla, CA

In: http://aquaticcommons.org/id/eprint/3684 | 8 | 2011-09-29 17:01:52 | 3684 | Inter-American Tropical Tuna Commission

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Publication Date: 2021-06-28

Description: ENGLISH: This report, published in response to the large volume of requests for information received by theIATTC, provides information on the catches, effort, and composition of the purse-seine and baitboatfleets which fished for tunas and tuna-like species in the eastern Pacific Ocean (EPO) in the 1979-1992period. It does not include data for longline fisheries operating in the EPO; that information may befound in the IATTC's Annual and other reports. The IATIC has published similar data for otherperiods in its Bulletin series (Shimada, 1958; Alverson, 1959, 1960, ~963; Martin, 1962; Calkins andChatwin, 1967, 1971; Calkins, 1975; Orange and Calkins, 1981) and in its weekly, quarterly, and annualreports. SPANISH: El presente informe, publicado como resultado del gran volumen de solicitudes de informaciónrecibidas por la CIAT, presenta información sobre las capturas, el esfuerzo, y la composición de lasflotas que pescaron atunes y especies afines con red de cerco o carnada en el Océano Pacífico oriental(OPa) en el período de 1979-1992. La CIATha publicado datos similares para otros períodos en suserie de Boletines (Shímada, 1958; Alverson, 1959, 1960, 1963; Martin, 1962; Calkins y Chatwin, 1967,1971; Calkins, 1975; Orange y Calkins, 1981) y en sus informes semales, trimestrales, y anuales.(PDF contains 102 pages.)

Description: This article is bilingual and contains both English and Spanish translations.

Keywords: Fisheries ; Eastern Pacific Ocean tuna fishery ; pesquería del atún del Océano Pacifico Oriental

Repository Name: AquaDocs

Type: monograph

Format: application/pdf

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