Marlon H. Román-Verdesoto

Marlon H. Román-Verdesoto
Inter-American Tropical Tuna Commission | IATTC · Bycatch

About

32
Publications
7,189
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535
Citations
Citations since 2016
26 Research Items
375 Citations
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20162017201820192020202120220204060
20162017201820192020202120220204060

Publications

Publications (32)
Article
Squid were recorded by observers in 192 (1.9%) of 9928 purse-seine sets in the tuna fishery in and near the Gulf of California, Mexico (north area) and off Peru and Ecuador (south area) during 1997–2002. The squid were identified as jumbo squid (Dosidicus gigas) in 19% of the positive sets, and it was assumed that the squid in the other sets were a...
Article
The zero-inflated negative binomial (ZINB) regression model with smoothing is introduced for modeling count data with many zero-valued observations, and its use is illustrated with shark bycatch data from the eastern Pacific Ocean tuna purse-seine fishery for 1994–2004. Based on the generalized information criterion, the ZINB regression model provi...
Article
Full-text available
The results of two recent genetics studies support assessing and managing the populations of silky sharks (Carcharhinus falciformis) in the western and eastern Pacific Ocean separately. One of the studies suggests a further division of silky sharks in the eastern Pacific Ocean (EPO) into two stocks, approximately along the Equator. An attempt to as...
Article
Full-text available
Management of large-scale pelagic fisheries relies heavily on fishery data to provide information on tuna population status because, for widely distributed populations, the cost of collecting survey data is often prohibitively high. However, fishery data typically do not provide direct information on interactions among fishing vessels, and thus met...
Technical Report
Full-text available
Electronic monitoring (EM) is increasingly being used worldwide to record the activities of fishing vessels, to complement human observer programs, and where on-board observer coverage is low or non-existent. EM uses sensors and cameras to record information on the vessel’s activities, and particularly its fishing operations and their results. EM i...
Technical Report
Full-text available
The importance of monitoring the FAD fishery as a whole has widely been claimed by scientists, managers and other stakeholders. Based on the recommendations and guidelines of the joint technical Working Group on FADs (Lopez 2019), as well as the repeated requests by some member countries on the production of specific data and analyses (e.g. IATTC-9...
Technical Report
Full-text available
The purse-seine FAD fishery is currently the most important way to capture tropical tunas in the EPO. FADs are a very efficient way of fishing; yet, as most fishing methods, they may also have negative effects on species and ecosystems, such as entanglement of sensitive species, contribution to marine debris and pollution or stranding events in vul...
Article
Full-text available
In fisheries, vulnerability assessments—also commonly known as ecological risk assessments (ERAs)—have been an increasingly popular alternative to stock assessments to evaluate the vulnerability of non-target species in resource- and data-limited settings. The widely-used productivity−susceptibility analysis (PSA) requires detailed species-specific...
Conference Paper
Full-text available
The present document aims at summarizing ongoing research on the reduction of impacts of FAD structure on the ecosystem, with special emphasis on the use of biodegradable FADs. This document represents task 2.3 of the FAD WG to inform Annex II of Resolution C-18-05.
Technical Report
Information on bycatches of sharks collected by observers of the Inter-American Tropical Tuna Commission (IATTC) between 1993 and 2004 is presented in this data report. This report contains two sections. The first section summarizes information used by the staff of the IATTC to review and revise IATTC observers’ at-sea species identifications of Ca...
Article
This research focuses on the description of the spatial and temporal distributions of mobulid ray species (Mobula birostris, Mobula mobular, Mobula thurstoni, Mobula tarapacana and Mobula munkiana) using data from the observer program (1993–2014) of the Inter-American Tropical Tuna Commission (IATTC). The tuna purse seine operations in the region e...
Article
Full-text available
This research focuses on the description of the spatial and temporal distributions of mobulid ray species (Mobula birostris, Mobula mobular, Mobula thurstoni, Mobula tarapacana and Mobula munkiana) using data from the observer program (1993–2014) of the Inter-American Tropical Tuna Commission (IATTC). The tuna purse seine operations in the region e...
Article
Recent large fluctuations in an index of relative abundance for the silky shark in the eastern Pacific Ocean have called into question its reliability as a population indicator for management. To investigate whether these fluctuations were driven by environmental forcing rather than true changes in abundance, a Pacific‐wide approach was taken. Data...
Article
Concerns about the ecological impact of recent increases in the use of drifting fish-aggregating devices (FADs) have led to implementation of FAD limits worldwide in purse-seine fisheries targeting tropical tunas. However, quantitative analyses supporting such management measures are needed. Analyses of observer data for purse-seine vessels operati...
Article
Full-text available
This study examined diversity and habitat characteristics for bycatch assemblages in two different types of fishing (drifting fish aggregating devices sets and sets made on school of tunas) in the eastern Pacific Ocean (20°S–30°N and 70°–150°W) between 2005 and 2011 using biodiversity metrics and Generalized Additive Models. Bycatch information was...
Article
Full-text available
1. Manta and devil rays of the subfamily Mobulinae (mobulids) are rarely studied, large, pelagic elasmobranchs, with all eight of well-evaluated species listed on the IUCN Red List as threatened or near threatened. 2. Mobulids have life history characteristics (matrotrophic reproduction, extremely low fecundity, and delayed age of first reproductio...

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Project (1)
Project
Analizar, entender y evaluar los efectos de la variabilidad climática sobre la Ecología Marina mediante el estudio de oscilaciones atmosféricas (índices climáticos costeros) a corto y mediano lazo. Describir y predecir señales e impactos de la variabilidad climática y la oceanografía biológica de poblaciones de peces, crustáceos y moluscos de interés comercial, así como en cultivos agrícolas, de regiones costeras principalmente en el Pacífico nororiental, incluyendo a los países de Estados Unidos, Canadá y México.