Juan Carlos Seijo

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Verified

Juan Carlos verified their affiliation via an institutional email.

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• Ph.D
• Professor at Universidad Marista de Mérida

This study examines the changes in the fishing regime caused by a tunicate epibiont invasion over a small-scale fishery of the pen shell Atrina maura analyzed by a bioeconomic spatial model. The regime shift caused by invasive species decreases the carrying capacity of native species, hindering biomass restoration strategies such as catch quotas, f...

The culture of seahorses Hippocampus erectus in captivity represents a window of opportunity for the diversification of the aquaculture activity in the ornamental industry. In this study, we have constructed a bioeconomic model to evaluate the optimal harvest time (OHT) over a culture period of 562 days. The bioeconomic model was integrated with th...

Abalone is a high-value resource that is an important export market fishery of Mexico that is managed through territorial use rights for fisheries allocated to a coastal community. A specific age-structured spatial bioeconomic model was applied to this fishery to undertake stock recovery to target levels. The model incorporates uncertainty in the p...

Abalone (Haliotis spp.) is a highly demanded product due to its quality. Although abalone production volume is not as high relative to other seafood products, it is highly valued; it amounted to nearly 2.6 billion dollars in 2017. Previously, global abalone production depended primarily on fisheries, but now days it relies mostly on aquaculture; to...

In the scientific literature it is possible to find a series of models for both stock and ecosystem evaluation that consider environmental changes. However, in Mexico, the conventional management of exploited resources presents weaknesses by not duly considering these changes in the management proposals. Nowadays, marine ecosystems, in addition to...

The complexity of stock recovery strategies in mixed-species fisheries involving heterogeneous resilience capacities of target and incidentally harvested species is further challenged by possible levels of illegal exploitation rates. This context adds to the uncertainty for decision-makers when establishing proper management measures to recover hig...

The bioeconomic sequential externalities in the white shrimp (Litopenaeus vannamei) fishery during 2014-2015 season in southern Sinaloa, Mexico, were analyzed by calculating the optimal size of the industrial fleet (trawlers) given the current oversized small-scale fleet (SSF: cayucos). For this purpose, we constructed a dynamic multi-fleet age-str...

The selling price is one of the essential variables in decision making for fishers regarding the catching of a fishing resource. In the case of the Pacific Mexican lobster fishery, the price uncertainty at the beginning of the season translates into the suboptimal utilization of this resource. This work aims to predict the export price of Mexican r...

Although Ocean Acidification OA has been identified as a potential threat to calcifying species, recent research has described a wide variety of possible responses (from vulnerability to high resilience) of these species to OA,. Hence, possible OA effects may be more complex, species-specific, and life-stage related than previously thought. Therefo...

The COVID-19 pandemic has impacted the fisheries and aquaculture sector, and public policies are needed to mitigate it. Nevertheless, the lack of information makes it challenging to generate an adequate response. It is relevant to study the sector's response to past shocks to generate the elements to react to present and future shocks. We present a...

A critical problem in the production of Nile tilapia Oreochromis niloticus in intensive and hyper-intensive systems is the heterogeneity of body sizes as it influences the final production and economic yield. The objective of this study was to calculate the bioeconomic effect of size heterogeneity on the production of Nile tilapia at a commercial l...

Illegal fishing (θj) affects recovery time-lines and produce economic losses for having to extend moratoria, especially when targeting high value species. The lack of data concerning the level of θj creates an uncertain context for decision maker to establish duration of moratorium or the need of extending it over time. With the use of a dynamic bi...

One of the main problems in the sequential Mexican-shrimp fisheries is the use of a constant catchability coefficient for fleets exploiting different population components implying a constant vulnerability in the population structure over time and age which denies important population processes and causes bias in fishery model outputs. The purpose...

Capture‐based aquaculture (CBA) is a strategy to capture wild aquatic organisms for rearing. The most iconic species produced under this scheme are bluefin tunas. In Mexico, CBA of this species is developed with Pacific bluefin tunas (PBFT). The parametrization of a biological production function able to describe biomass dynamics during the product...

This work reports on how benefits were distributed among fishers of two rights-based managed small-scale spiny lobster (Panulirus argus) fisheries, presenting individually and collectively based territorial use rights regimes. In the individually based fishery of Punta Allen, members of the local fishing cooperative have exclusive access to individ...

Hookah diving is a fishing method used in many small-scale fisheries in the Gulf of Mexico and the Caribbean Sea, as well as in many coastal fisheries around the world. Many high-value species like sea cucumber and spiny lobster, among others, are harvested via hookah diving. However, the fishing method presents a risk for both decompression illnes...

Efforts to effectively conserve and manage marine resources are facing increasing complexity of environmental and governance challenges. To address some of these challenges, this book presents advancements in fisheries bioeconomics research that provides significant ideas for addressing emerging environmental and fisheries management issues. Advanc...

The improvement of survival in some species due to the close coexistence between individuals is a concept that has caught the attention of scientists over the years. This behaviour has been documented in many taxa, including species which support commercial fisheries. In recent years, a better understanding of the mechanisms associated with the All...

The fishery supported by Octopus maya Voss and Solis, 1966, has been managed with season closure, minimum legal size and gear restrictions. The opening of the fishing season occurs during the breeding season of this species, which could create concerns regarding sustainability. To analyse the implication of this regulation, the dynamics of the fish...

This work reports on how benefits are distributed among the owners of fishing grounds in the spiny lobster (Panulirus argus) fishery of Punta Allen, Mexico. This MSC certified (2012) small-scale fishery, has been co-managed as a Territorial Use Rights Fishery (TURF) since 1969. Members of the local fishing cooperative, have exclusive access to indi...

https://www.routledge.com/Governing-the-Coastal-Commons-Communities-Resilience-and-Transformation/Armitage-Charles-Berkes/p/book/9781138918436

This study presents a bioeconomic analysis of artificial shelter performance in a fishery targeting a spiny lobster meta-population, with spatially allocated, individual exclusive benthic property rights for shelter introduction and harvest of species. Insights into fishers’ short-run decisions and fishing strategies are also provided. Spatiotempor...

The impact of ocean acidification on fisheries is a relatively new issue facing decision-makers, and one for which very little empirical data is available to draw upon. This paper demonstrates how, despite the lack of knowledge, well-established methods of bioeconomic modelling and decision analysis can be applied to address the challenge. A decisi...

Marine ecosystems are subject to different disturbances such as trophic relationships, environmental changes, overfishing and social pressure, which may modify their structure and functioning over time; and therefore, these disturbances increase uncertainty about management strategies of fisheries resources. The objetive of this study is contribute...

Ecosystem approach for fisheries management has been promoted in recent time before the challenge of collapsing fisheries worldwide. The aim of this study is to accomplish a bioeconomic analysis of fisheries by maximizing net income and conserving ecosystem stability, in order to explore if there is a relationship between the ecosystem and bioecono...

This chapter identifies current training and capacity building to facilitate the process of shifting from fisheries governance of targeted single-species stock assessment and management to an ecosystem approach to fisheries governance considering ecological, economic and social interdependencies. It also identifies and discusses linkages of capacit...

Management plans and policy for lobster fisheries usually specify the objective of creating economic benefit from harvests, which is best supported by collection of economic data to evaluate management decisions. The economic benefit from several lobster harvests worldwide is measured as “sustainable economic yield”, which is the long-run, sustaina...

This study aimed to select the most appropriate stocking density in the different annual climatic seasons, taking into account the thermal uncertainty and the risk preferences of the producer. To achieve this objective a decision theory approach (the decision table framework) and decision criteria with and without probabilities were used. The decis...

This document aims to provide a better understanding of the wide range of rights-based fisheries management systems in Latin-America. Rights-based management in the Latin American region is evolving, thus creating a wide diversity of schemes responding to local fisheries contexts, and institutional, resource and ecosystem dynamics and governance ca...

p>In order to ensure sustainable use of their shared marine resources, the nations of the West Caribbean Region must adopt an approach that encompasses both the human and natural dimensions of ecosystems. This volume directly contributes to that vision, bringing together the collective knowledge and experience of scholars and practitioners within t...

The estimation of natural mortality (M) is critical for stock assessment and fisheries management. The shrimp fishery is the most valuable one in Mexico and along the Pacific Coast of Mexico, and exploitation primarily targets three species: white (Litopenaeus vannamei), blue (L. stylirostris), and brown (Farfantepenaeus californiensis). It is a se...

This paper focuses on the consequences of a geographical differentiation in reproductive potential through a species range not being recognized in the management of a coastal fishery resource. A dynamic spatial model with age-structure and bioeconomic components was built to explore the potential effects of fishing port location on metapopulations...

This paper presents an overview of the key characteristics of small-scale coastal marine fisheries in Latin America and the Caribbean as well as an examination of some of the weaknesses, gaps, and challenges faced in fisheries assessment and management within the region. The information here is based largely on discussions involving a range of scie...

From all of the fishing resources in the Caribbean region, a shared metapopulation of spiny lobster (Panulirus argus) has the highest market value, which together with its abundance and wide distribution, makes it the main source of income for a large number of coastal communities. Within this region, responsible use of shared marine areas, like th...

The management of marine fisheries needs to undergo dramatic change in the new millennium, in response to the well–documented evidence of global overfishing and the general depletion of commercial fish stocks. The axioms of sustainable development and equilibrium productivity of wild ecosystems are identified as misleading concepts, which nonethele...

Most fisheries models are based on dynamic pool assumptions. For sedentary and sessile species, these assumptions are inadequate, because they are spatially distributed in patches that vary in size, density and age structure. A simple bioeconomic model, negative binomial (NEGBIN), is proposed; this model relaxes the dynamic pool assumption without...

Designing intelligent management strategies for shrimp aquaculture systems require recognising the uncertainty and risks associated with different processes of aquaculture production. To account for natural variability and other sources of uncertainty, estimates of appropriate aquaculture bio‐economic indicators are needed to re‐evaluate periodical...

Statistical analysis of the red grouper (Epinephelus morio) fishery in the Yucatan continental shelf indicates that this species follows a constant pattern of spatial distribution through time. Using time series of relative abundance from 1984 to 2001 (commercial CPUE) by month and fishing area, red grouper distribution was addressed by means of se...

Undiscounted changes in the value of female fish from birth to maturity are calculated at equilibrium given a vector of natural mortality at age. Two types of valuations are compared; the summed harvested value of cohorts under given natural and fishing mortality vectors, and the reproductive contribution of different ages lost on capture. Incorpor...

Reducing water exchange in shrimp aquaculture to minimize discharge of pollutants is a search for sustainability. In desert regions, like most of northwest Mexico, low water exchange must be complemented with artificial aeration to compensate for low levels of oxygen in warm and highly saline water. The economic yield of a low‐water‐exchange produc...

Northwest Mexican coastal waters have large seasonal temperature variations, high salinity, and are subject to intense solar radiation. Shrimp farms in this region have been using two annual production strategies; six- to eight-month cycle with one complete harvest and several partial harvests, or two, three- to four-month cycles with complete harv...

The design of intelligent management plans for marine fisheries requires recognition of the uncertainty of marine systems when assessing fishery performance through the use of bio-economic indicators. The uncertainty causing variability in the estimated values of the bio-economic indicators is incorporated through the use of Monte Carlo analysis to...

A bioeconomic model integrating biological and economic factors is developed for the Pacific sardine fishery in the Gulf of California. The model factors in the dynamics of the population structure and applies the basic concepts of the cohort-survival method. Seasonal recruitment was modeled with the distributed-delay method. The dynamics of the fl...

This paper develops a bioeconomic approach to yield–mortality models. The usefulness of the conceptual background of these models, and the application of the resulting reference points (RPs), are analysed in a precautionary management framework. Quantification of uncertainty by bootstrapping provided a more realistic comparison of the relative perf...

La langosta Panulirus argus es uno de los recursos pesqueros críticos del Golfo de México y Mar Caribe debido a su elevado valor comercial. Sin embargo, las características de su ciclo de vida y la diversidad en los métodos y regímenes de pesca empleados en la región conllevan incertidumbre en las relaciones causa-efecto de los procesos biológicos...

One of the principal problems when dealing with fishery resource management is to estimate strategies that satisfy biological, economic and social objectives simultaneously. As a contribution to solving this problem in the Yucatan Shelf Octopus (Octopus may a) fishery, a multi-criteria non-linear optimization procedure was applied to a dynamic bioe...

The use and management of shrimp and groundfish resources of the Brazil–Guyana shelf require a systematic integration of the resource biology and ecology with the economic and social factors that determine resource and fishers' behaviour over time. The approach suggested for the development of management strategies for shrimp and groundfish fisheri...

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