Luis Gustavo Cardoso

Universidade Federal do Rio Grande (FURG) | FURG · Institute of Oceanography - IO

The shortfin mako shark, Isurusoxyrinchus, plays essential ecological and economic roles in all oceans as a top predator and an important fishery resource. However, knowledge of its reproductive biology is still incomplete on a global basis, mainly due to a lack of sampling of mature females, particularly pregnant ones. In this paper, we studied th...

Endangered sharks and rays usually often lack basic information specific to conservation, such as population size. Previous studies have reconstructed shark and ray catch statistics between 1950 and 2019 for the southeast = south of Brazil, but lacking detail at the species level, because the catches were grouped by family, genus or even common nam...

The Angular Angelshark (Squatina guggenheim) and the Brazilian Guitarfish (Pseudobatos horkelii) are two remarkable species of elasmobranchs known to occur from the shallow nearshore waters to the slope regions of the southwest Atlantic Ocean. Unfortunately, both species are listed as critically endangered in Brazil due to high fishing pressure bet...

Tuna Regional Fishery Management Organizations (tRFMOs) are increasingly interested in spatiotemporal management as a tool to reduce interaction rates with vulnerable species. We use blue shark (Prionace glauca) as a case study to demonstrate the critical first steps in the implementation process, highlighting how predictions of global habitat for...

Pelagic longline fishing globally raises concerns for adverse interactions with non-target species, prompting the need for sustainable practices and effective mitigation. Adherence to bycatch measures varies globally, driving efforts to find cost-effective alternatives sustaining target species catch while minimizing bycatch. Our study, based in a...

The blue shark is a highly migratory species with a worldwide distribution, making it susceptible to multiple fishing fleets across the globe. In southern Brazil, it is an important target, comprising up to 40% of the total biomass landed by the commercial surface longline fleet. This study aims to contribute to a better understanding of how the sp...

Desde a década de 1990, a pesca demersal do Sudeste e Sul do Brasil tem se diversificado, incorporando uma ampla gama de espécies de peixes e invertebrados existentes na Margem Meridional Brasileira. O processo de ordenamento dessa atividade, por outro lado, manteve-se focado em poucas espécies-alvo e nunca evoluiu para acomodar a diversificação de...

Blackfin tuna Thunnus atlanticus often inhabits warm waters of the western Atlantic Ocean from 40°N (Cape Cod, USA) to 22°S (Rio de Janeiro, Brazil). We recorded the first catches of the species in southern Brazil (34°S) and described its new distribution and fishing grounds. Since 2007, annual catches per trip and frequency of blackfin tuna landin...

Information on natural resource exploitation is vital for conservation but scarce in developing nations, which encompass most of the world and often lack the capacity to produce it. A growing approach to generate information about resource use in the context of developing nations relies on surveys of resource users about their recollections (recall...

We applied the JABBA model for Atlantic blue marlin (Makaira nigricans) with the best available data through 2022. Preliminary JABBA stock assessment results suggest reasonably robust fits to the data as judged by the presented model diagnostic results. The resulting stock status for 2022 was generally consistent and predicted with high probabiliti...

Bayesian State-Space Surplus Production Models were fitted to yellowfin tuna catch and standardized catch-per-unit-effort (CPUE) data using the open-source stock assessment tool JABBA. Following the recommendations from the yellowfin data preparatory meeting in April 2024, we present a continuity run based on the 2019 final JABBA model and the prel...

Description de la phase pilote et la phase d'inventaire du projet IRRAE "Inventaire des raies et des requins autour de La Réunion à partir d’analyses d’ADN environnemental avec une approche écosystémique (élasmobranches et poissons osseux) ".

Otoliths are acellular apposition structures composed of approximately 90% of calcium carbonate and other inorganic salts, which develop over a protein matrix located in the inner ear of bony fishes playing an essential role in the senses of balance and hearing. These structures grow throughout a fish’s lifetime. Owing to their species-specific sha...

A formerly unexploited stock of red porgy that was intensely fished along southern Brazil in the 1970s collapsed in less than a decade. Subsequently, population dynamics or stock status has not been reported, so we updated growth parameters by analysis of otolith annual-increments and micro-increments. Growth did not change after the stock collapse...

Species distribution modelling (SDM) of marine organisms is widely developed for biogeography, ecology and management purposes. However, most studies continue to focus on the Global North, with fewer examples for the Global South. We carried out a bibliometric analysis to characterise aspects of studies conducting SDM for species in the Southwester...

French: Ce projet se divise en deux volets (Figure A). Le premier volet, appelé étude pilote, avait pour objectif d'optimiser une méthode non invasive, reproductible et standardisée pour réaliser l'inventaire et le suivi des requins autour de La Réunion, tout en complétant cette approche par une analyse écosystémique incluant les autres élasmobran...

This is the first assessment of blackfin tuna Thunnus atlanticus stock status. The aim of the present study was to estimate the status of its Southwestern stock using length-based models. A total of 1929 individuals was gathered in four years of length data (1998–2019). Two length-based models were applied, Length-Based Spawning Potential Ratio (LB...

Age, growth, and maturity of the bluewing searobin Prionotus punctatus were studied to assess its stock status in southern Brazil. Total length compositions, weight, sex, and maturity stage were recorded from commercial landings, and ages were estimated from transverse sections of the sagittal otolith. The oldest observed specimen was a 12-year-old...

Climate change impacts on fishery resources have been widely reported worldwide. Nevertheless, a knowledge gap remainsvfor the warm-temperate Southwest Atlantic Ocean—a global warming hotspot that sustains important industrial and small-scale fisheries. By combining a trait-based framework and long-term landing records, we assessed species’ sensiti...

Abnormal embryonic development may result from mutations caused by genetics, environmental conditions or viruses. This study reports cases of cyclopia and a mouth malformation in two embryonic blue shark Prionace glauca collected off southern Brazil (South-western Atlantic). Such malformations are likely to reduce the chances of survival of embryos...

Ecological niche models (ENMs) and species distribution models (SDMs) have been widely applied to various studies relevant to biogeography, conservation biology, and ecology. These modelling techniques seek to develop spatial maps for projecting , among others past, current, and future species distributions. Born in the field of terrestrial ecology...

We first attempted to apply the JABBA Models for the eastern Atlantic sailfish (Istiophorus platypterus) with the best available data through 2021. Results suggest reasonably robust fits to the data as judged by the presented model diagnostic results. The resulting stock status for 2021 was generally consistent and predicted with high probabilities...

We first attempted to apply the JABBA Models for western Atlantic sailfish (Istiophorus platypterus) with the best available data through 2021. Results suggest reasonably robust fits to the data as judged by the presented model diagnostic results. The resulting stock status for 2021 was generally consistent and predicted with high probability that...

Catch and effort data performed by the Brazilian tuna longline fleet in a wide area of the South Atlantic Ocean from 1994 to 2020 were analyzed. The fishing effort was distributed over a wide area of the Atlantic Ocean. The CPUE of sailfish was standardized by a GLM using a Delta Lognormal approach. The factors used in the models were: year, quarte...

The aim of this study was to evaluate spatiotemporal patterns in the distribution and relative abundance of blue sharks and their relationship with environmental variables and oceanographic processes in the southwestern Atlantic Ocean. We modeled data on catch records from the Brazilian pelagic tuna longline fleet using generalized additive models...

During the 2022 ICCAT Atlantic skipjack stock assessment, the model adopted for management advice was based on the Stock Synthesis and included a set of scenarios, including an uncertainty grid for the growth pattern and steepness, totalizing nine different models. The present analysis aimed to update the initial trials of the management strategy e...

This document provides the final stock status and projection results for western skipjack using Stock Synthesis and assuming a multivariate lognormal distribution across a nine-model uncertainty grid. The Tropical Tuna Species Group reviewed preliminary projections during the stock assessment workshop, and agreed to finalize all results for adoptio...

Identifying changes in the population structure and dynamics for fish stocks is important to support its management. Data obtained from 1976 to 2019 allowed to follow up long more than four decades the changes in the population structure and life-history of Umbrina canosai, an intensely exploited demersal sciaenid fish in southern Brazil. Intense f...

The life history and population dynamics of the marine demersal bony fish Percophis brasiliensis were studied to assess its stock status in southern Brazil. Specimens were sampled from commercial landings, and the length, weight, sex, and maturity stage were recorded from each individual. Sagittal otoliths were removed for aging, and the gonads wer...

Recent studies on the genus Lampris revealed five cryptic species within Lampris guttatus; however, the new phylogenetic structure of the globally distributed group claims more information from the South Atlantic Ocean. The present work, with a focus on the Lampris genus fishes from the Southwest Atlantic Ocean (SWAO), aims to (i) fulfill a gap in...

Sustainable fisheries' managers increasingly seek to implement measures that reduce the mortality of threatened species while maintaining or increasing catch of target species. Our study proposed a simple management option for optimizing fishing over daily and seasonal scales to maximize catch success while protecting non-target species in pelagic...

Catch and effort data performed by the Brazilian tuna longline fleet in a wide area of the South Atlantic Ocean from 1994 to 2020 were analyzed. The fishing effort was distributed in a wide area of the Atlantic Ocean. The CPUE of the swordfish was standardized by a GLM using a Delta Lognormal approach. The factors used in the models were: year, qua...

In the present analysis, port sampling and logbook records from the Brazilian handline tuna fishery in associated schools in the western tropical Atlantic, from 2010 to 2020, were used to generate a standardized CPUE series by a Bayesian generalized linear model using Integrated Nested Laplace Approximation (INLA) approach. The standardized catch r...

Catch and effort data from the Brazilian baitboat fishery in the southwestern Atlantic Ocean, from 2000 to 2021, were analyzed in this working paper. The effort was distributed between 19º S and 35º S. Bayesian Spatial-Temporal Hierarchical models using Integrated Nested Laplace Approximations with a Lognormal distribution were used to standardize...

More than 75% of the total catches of the western Atlantic skipjack tuna stock are performed by the baitboat fishery along the south and southeastern Brazil. This fishery has been well sampled but occurs in a restricted area concerning the entire stock distribution preventing a comprehensive analysis of the fish size's spatial distribution. However...

The present analysis aimed to update the initial operating models (OMs) for the management strategy evaluation for Western Atlantic skipjack tuna. The OMs were conditioned using the same fleet structure agreed during the ICCAT Data Preparatory for Skipjack tuna meeting in February 2022, with the catch time series spanning from 1952 to 2020, CPUEs,...

This document describes the provisional and the final version of the stock assessment model using Stock Synthesis (SS) for the western Atlantic skipjack. The model runs from 1952 to 2020 and was fit to length composition data, 5 indices and 5 fishing fleets. Growth was fixed in the model, with three alternative growth scenarios considered based on...

Bayesian State-Space Surplus Production Models were fitted to Eastern Atlantic skipjack tuna catch and CPUE data using the 'JABBA' R package. This document provides the final JABBA stock assessment results since the 2022 stock assessment meeting. Following the recommendations by the Tropical Tuna Species Group at the 2022 Stock Assessment meeting,...

Bayesian State-Space Surplus Production Models were fitted to Western Atlantic skipjack tuna catch and CPUE data using the 'JABBA' R package. The ten scenarios were based on the previous assessment and on uncertainty grid proposed during the 2022 SKJ Data Preparatory Meeting, which in summary corresponded to nine runs based on variations in growth...

Bayesian State-Space Surplus Production Models were fitted to Eastern Atlantic skipjack tuna catch and CPUE data using the 'JABBA' R package. The ten scenarios were based on the previous assessment and on uncertainty grid proposed during the 2022 SKJ Data Preparatory Meeting, which in summary corresponded to nine runs based on variations in growth...

Onboard discards of a fraction of the catch can be considered one of the main issues related to bottom trawling fisheries. The magnitude and composition of the discards still need to be better understood. We assessed the industrial bottom pair trawling fishery’s discards from southern Brazil by monitoring 159 fishing hauls during four fishing trips...

Identifying populations and establishing the connectivity between neighbouring stocks are central issues for the assessment and management of coastal marine fish species. In this paper, we analysed the population structure of the demersal sciaenid argentine croaker Umbrina canosai, endemic in the warm, temperate southwestern Atantic between southea...

We analysed the long-term changes in the population dynamics and life history of whitemouth croaker (Micropogonias furnieri) off Southern Brazil, to understand how four decades of heavy fishing (1976–2017) has affected its population dynamics. In the first three decades, size and age structure were eroded with the loss of the larger (> 60 cm total...

Rising concentrations of plastic in the oceans are leading to increasing negative interactions with marine biota, including ingestion by endangered and/or economically important seafood species such as fish. In this paper, we visually evaluated plastic debris ingestion by 965 specimens of eight commercially exploited fish species from different mar...

Otolith shape analysis is a powerful method for fish stock identification. We compared the otolith shape of Pagrus pagrus (Linnaeus 1758) along with its distribution in four south‐western Atlantic regions where it is commercially fished: Rio de Janeiro, Rio Grande do Sul in southern Brazil, the Argentine‐Uruguayan Common Fishing Zone (UA) and the A...

The intense exploitation since 1972 of the formerly only slightly exploited protogynous hermaphroditic fish Pagrus pagrus (L.) in southern Brazil has led in less than a decade to the collapse of the fishery, with no recovery four decades later. In this study we analized the age structure, growth, reproduction and mortality of the species were studi...