Fran Saborido-Rey

Spanish National Research Council | CSIC · Instituto de Investigaciones Marinas

Stock reproductive parameters that include demography changes and maternal effects potentially improve recruitment estimation in contrast to the conventional spawning stock biomass (SSB) approach.

Genetics as a tool for sustainable fishing and protection of vulnerable marine ecosystems VME

Vulnerable marine ecosystems (VMEs) are characterized by being highly vulnerable to disturbances and an impaired ability to recover that takes a long time and is not always possible. Some of these vulnerable marine habitats include seamounts, hydrothermal vents or cold water coral reefs. Cold water corals are of significant ecological value and pro...

Knowing the number of individuals in a population is fundamental for the sustainable management of exploited marine resources but estimating this parameter is often extremely challenging, especially in large, highly mobile and dispersed populations. Abundance estimation traditionally relies on multiple data types that include the relationship betwe...

Stock assessments serve to monitor the condition of fish stocks and exploit them sustainably but require accurate data such as growth and mortality rates as input parameters. Most species fished worldwide lack the data needed to assess their status and even those closely assessed are often based on parameters that are known to contain uncertainty....

In Europe, research surveys carried out by state governments provide the great majority of fishery-independent data. Member States (MS) in the European Union (EU) regularly conduct research surveys to provide the necessary data to assess the status of exploited fish stocks and to monitor the general condition of the marine ecosystem. In the surveys...

An increasing number of studies using marine environmental DNA (eDNA) approaches are showing its potential application in marine fisheries management by helping and simplifying some of the labor-intensive traditional surveys required to assess exploited populations and ecosystem status. eDNA approaches (i.e. metabarcoding and targeted) can support...

The oceans are facing increasing pressure related to water warming, acidification, pollution, overex-ploitation and illegal activities, which generate biodiversity loss and ecosystem degradation, placing at risk the provision of goods and services. In order to preserve healthy and resilient marine ecosystems , adaptive scientific tools for the sust...

The conservation of a sufficient reproductive potential of an exploited stock is one of the goals of fisheries management, as it ensures sustainable productivity. However, there is evidence that spawning stock biomass (SSB) does not represent well the variation in stock reproductive potential, often leading to impaired stock-recruitment relationshi...

Daily growth patterns and their relationship with reproduction was analyzed in the European hake from the Galician Shelf, where it shows a very protracted spawning with three spawning peaks. The daily growth analysis was performed in otoliths of adult females on the transversal section of the sagittae otolith. Daily increments were measured from th...

The trophic ecology of European hake (Merluccius merluccius) larvae and early‐juveniles from the Iberian shelf off Galicia (NW Spain) are assessed by means of stable isotopes (SIA) and nutritional condition in conjunction with hydrobiological variations observed during the winter and summer season of 2012. Hake early‐juveniles (18–47 mm SL) showed...

Flemish Cap cod collapsed in the early 90’s after facing multiple threats due to climate variability and anthropogenic pressures. A master 35-year cod growth chronology was reconstructed in the present study by using sclerochronology techniques. Three additional chronologies were developed to account for the age-dependent effect of maturity and fis...

La celebración del V SIBECORP en Colombia, fue motivada por el interés de enriquecer la discusión sobre la reproducción en organismos acuáticos y su importancia para las pesquerías de ecosistemas tropicales, lo que ha sido escasamente abordado en pasadas ediciones. Por ello, los talleres temáticos de esta edición se dedicaron a Pesquerías de pequeñ...

O III SIBECORP será constituído por uma programação abrangente, envolvendo 106 Trabalhos (53 pôsteres, 34 apresentações orais e 19 palestras) que versam sobre temas relevantes no Brasil; Argentina; Espanha; Portugal; Colômbia; Chile; Peru e México. Os palestrantes e debatedores convidados são pesquisadores de prestígio no Brasil ou atuantes em dive...

SIBERCORP es uno de los eventos más importantes de la red INVIPESCA que tiene el fin de establecer cada tres años un foro de discusión científico para promover la aplicación del enfoque de ecosistemas en la gestión de las pesquerías iberoamericanas, a partir de la inclusión de aspectos biológicos, ecológicos, ambientales y socioeconómicos en la eva...

Doce años después de la celebración del I Simposio Iberoamericano de Ecología Reproductiva, Reclutamiento y Pesquerías-SIBECORP y de la creación de la Red Iberoamericana de Investigación Pesquera-Red INVIPESCA tenemos entre manos una publicación que resume y compila los conocimientos compartidos en las cuatro ediciones de SIBECORP celebradas hasta...

The European hake (Merluccius merluccius) is represented as one of the most valuable fisheries in the Galician shelf. We analyzed the distribution, abundance, and environmental conditions of the southern-stock European hake larvae from the Galician shelf during the two main spawning peaks, winter-spring and summer, based on the data from three icht...

The Galician shelf (northwestern Iberian Peninsula) is a highly dynamic area with an important multi-species fisheries industry that exploits resources from several habitats, characterized by being not only highly diverse, rich, and productive but also seasonally and interannually variable. Early life stages of different species are distributed thr...

Fishes are the only vertebrates that undergo sex change during their lifetime, but even within this group, a unique reproductive strategy is displayed by only 1.5% of the teleosts. This lability in alternating sexual fate is the result of the simultaneous suppression and activation of opposing male and female networks. Here, we provide a brief revi...

The protection of fish nurseries has been recognized as a useful tool to efficiently manage fisheries given that protected areas enhance the recruitment of target species. To identify and locate potential nursery areas, a solid understanding of species-environment relationships and their spatio-temporal dynamics is needed. Within this context, in t...

The study of phenotypic variation patterns among populations is fundamental to elucidate the drivers of evolutionary processes. Empirical evidence that supports ongoing genetic divergence associated with phenotypic variation remains very limited for marine species where larval dispersal is a common homogenizing force. We present a genome‐wide scale...

Presentation of the INVIPESCA network objectives, activities and history

Maternal attributes may influence the quantity and quality of offspring and hence, their survival. We evaluated the seasonal variability in maternal effects on developing oocytes and larvae of European hake Merluccius merluccius from the southern stock. Females were collected in 10 different years between 1999 and 2017 in the 3 spawning seasons ide...

Information on temporal variations in stock reproductive potential (SRP) is essential in fisheries management. Despite this relevance, fundamental understanding of egg production variability remains largely unclear due to difficulties in tracking the underlying complex fluctuations in early oocyte recruitment that determines fecundity. We applied a...

Fisheries management has focused on optimizing yield and harvest while ensuring long-term sustainability. However, management has often pragmatically ignored the impact of fishing mortality on stock resilience and the synergetic effect of environmental forces in fitness and resilience, especially if regime shifts have occurred. European hake (Merlu...

Despite its economic importance, the population structure of the European hake, Merluccius merluccius, is unresolved, and the species is assessed based on two stocks (northern and southern) separated by the Capbreton Canyon. In order to shed light into the European hake population structure, we used Restriction-site-Associated DNA sequencing (RAD-s...

The study of biology and population dynamics of fish species requires the estimation of fecundity in individual fish in a routine way in many fisheries laboratories. The traditional procedure used by fisheries research is to count the oocytes manually on a subsample of known weight of the ovary, and to measure few oocytes under a binocular microsco...

Study of follicular atresia occurrence and intensity in fish ovaries are key factors to estimate realized fecundity and hence stock reproductive potential. These structures are the consequence of a rapid degenerative process by which oocytes at different stages are lost from the ovary. They have been classified according to their resorption state i...

European hake (Merluccius merluccius) ovaries have been sampled regularly since 1999 until 2004. Since December 2002 with the Prestige oil spill weekly samples were collected in order to asses the potential impact of the fuel. Maturation proccess, fecundity, energetic reserves dynamic and atresia have been analyzed in females. Changes in the differ...

Potential and batch fecundity has been estimated in european hake (Merluccius merluccius) on Galician coast from 1999 to 2004. It is known that female fish proximate composition may act as determining factor in reproductive success and egg production. Energetic components (lipids, proteins and glycogen) of different body tissues (liver, muscle and...

Length at maturity may be used as an indicator parameter of fish stocks health and of their exploitation degree, since length at maturity decreases have been recorded in highly exploited fish populations. In this study, female maturity ogive has been estimated using histological analysis. A comparative analysis of size at maturity of European hake...

BACKGROUND: Spawning stock biomass (SSB) has been generally used as an indicator of spawning stock production but it is not exact because there are other factors like size, experience or condition that affect capacity of females to produce viable offspring that may eventually recruit to adult population or fishery. This ability is the Stock Reprodu...

Introduction Estimation of individual egg production is a key step to understand the relationship between stock and recruitment or to assess spawning stock biomass using egg production. Here we demonstrate a fecundity method that uses less toxic fixative and is less labour intensive whilst automating the work and improving the accuracy of populatio...

Spawning stock biomass (SSB) has been generally used as an indicator of spawning stock production but it is not exact because there are other factors like size, experience or condition that affect capacity of females to produce viable offspring that may eventually recruit to adult population or fishery. This ability is the Stock Reproductive Potent...

Estimation of fish stock reproductive potential has been of increasing importance in recent years. It involves the estimation of several key parameters in a routine basis, such as potential and/or batch fecundity, spawning fraction, atresia… To achieve this routinely it is highly recommended the use of methodologies that reduce time for estimation,...

A generalized simple bioenergetic model was used to estimate consumption of European hake in both north- and southern stocks for the period 1994-2008. Consumption in biomass was estimated from weight-at-age data and growth parameters and then converted to energy intake in kJ using the prey-preference by size in percentage obtained from stomach cont...

European hake is one of the most important economic resources for South European fleets. Currently it is considered an overexploited stock and consequently, UE has implemented a recovery plan whose main criteria for judging the status of the stock is the spawning stock biomass (SSB). Maturity data are the basic information to estimate SSB as well a...

In the present study, 604 L. boscii females from the Galician Shelf and 204 L. whiffagonis females from the northern North Sea were sampled in the period 2007-2008 and 2011 respectively. L. boscii ranged from 13.6-39.7 cm total length while L. whiffagonis ranged from 30-55 cm. Oocyte density and mean diameter were estimated for both species to calc...

Flemish Cap cod collapsed in early 90’s after facing multiple threats due to climate variability and anthropogenic pressures. This study try to disentangling the effect that these and other extrinsic factors (such us prey availability, density dependency and maturity) have on cod growth, analyzing 35-years of growth chronology reconstructed by usin...

Cephalopods are a versatile group with several mechanisms in place to ensure the success of future generations. The Patagonian long-finned squid (Doryteuthis gahi) populations on the southern Patagonian shelf are believed to be genetically homogenous, but the mechanisms connecting them geographically and temporally are unresolved. Individual growth...

The bluemouth, Helicolenus dactylopterus (Delaroche 1809), is a marine demersal fish that is widely distributed in the Atlantic and the Mediterranean. It is targeted by longline fisheries around the Iberian Peninsula and it is a common by-catch associated with many demersal fisheries. However, limited information exists about the population structu...

Las Islas Cíes constituyen un paraíso de la biodiversidad marina del que participa una importante flota artesanal pesquera y marisquera, cuya actividad se centra mayoritariamente en la extracción de especies de valor comercial como el pulpo o la navaja. Pero además de las especies marinas productivas existen especies de indudable valor como iconos...

Understanding the controls and basis of biological processes such as oogenesis and fecundity is crucial to forecast productivity changes (Morgan 2017). The selection of the method to estimate egg production is based on the fecundity type which remains uncertain for many stocks . Moreover, early oocyte recruitment, which is in the bottom of year-cla...

This article attempts to set out a research agenda on the origin and evolution of hake exploitation in the Northeast Atlantic through a combination of zooarchaeological data with history and fisheries biology. An overview of archaeological hake remains from the Iberian Peninsula is presented and discussed in terms of a series of long-established pa...

Flemish Cap is an isolated fishing ground located in the international waters of the Northwest Atlantic Fisheries Organization area (NAFO). In the last decades, the Flemish Cap demersal community has been subjected to strong and variable fishing intensities affecting different stocks over time. In this work, three ecological indices for individual...

The European hake (Merluccius merluccius) is an indeterminate spawner that shows a protracted reproductive season. While the Northern stock displays a single spawning peak in spring, the southern stock shows two peaks, in spring and summer. Under the hypothesis that these seasonal components correspond to different spawning populations, we would ex...

The 3M redfish assessment is focused on the beaked redfish, regarded as a management unit composed of two populations from two very similar species: the Flemish Cap S. mentella and S. fasciatus. The reason for this approach is the historical dominance of this group in the 3M redfish commercial catch. However a new golden redfish fishery (S. marinus...

The distribution and demographic patterns of marine organisms in the north Atlantic were largely shaped by climatic changes during the Pleistocene, when recurrent glacial maxima forced them to move south or to survive in northern peri-glacial refugia. These patterns were also influenced by biological and ecological factors intrinsic to each species...

Sequential hermaphroditism is a unique reproductive strategy among teleosts that is displayed mainly in fish species living in the coral reef environment. The reproductive biology of hermaphrodites has long been intriguing; however, very little is known about the molecular pathways underlying their sex change. Here, we provide the first de novo tra...

Multispecies modeling is being increasingly accepted in stock assessment, especially in the context of an ecosystem approach to fisheries management (EAF). To achieve a future implementation of an EAF in the Flemish Cap, we present a multispecies model developed in Gadget, which covers the main commercial stocks over the period 1988–2012: cod (Gadu...

The common dentex Dentex dentex is an iconic endangered species in the Mediterranean, where it is a target species that is sought after for small-scale, recreational and spearfishing fisheries. The reproductive biology of D. dentex in the natural environment is poorly known; therefore, the reproductive strategy of the species was assessed through a...

An acoustic study was conducted on the Galician shelf (NW Spain) during late winter 2012 to detect and assess larval fish abundance. An echo sounder operating with 18, 38, 70, 120 and 200 kHz split-beam, hull-mounted transducers was employed. We analysed the acoustic records in order to describe vertical and horizontal distribution patterns of larv...

The ballan wrasse, Labrus bergylta (Labridae), is a protogynous hermaphrodite fish common in the north-eastern Atlantic from Norway to Morocco. It is a commercially important resource for local fisheries and is currently being used as cleaner fish to control sea lice in salmon farms in northern Europe. Two distinct colour patterns have been recentl...

The ballan wrasse, Labrus bergylta (Labridae), is a protogynous hermaphrodite fish common in the north-eastern Atlantic from Norway to Morocco. It is a commercially important resource for local fisheries and is currently being used as cleaner fish to control sea lice in salmon farms in northern Europe. Two distinct colour patterns have been recentl...

Fishes display a large number of reproductive strategies. They are poikilotherms with indeterminate growth, and thus environment influences the energetic balance and the existing trade-offs between growth and reproduction that optimize reproductive success. These trade-offs strongly influence the temporal pattern of reproduction: timing of sexual m...

O vermelho-verdadeiro (Lutjanus vivanus), é um Lutjanidae de altas profundidades que habita recifes tropicais desconectados da costa e oceánicos. Apesar da sua importância comercial para as pescarias artesanais do nordeste brasileiro, a sua ecologia reprodutiva é desconhecida, informação geralmente utilizada na regulação pesqueira. Com o objetivo d...

The composition and structure of the larval fish community (LFC) in the NW Iberian upwelling system in late winter 2012 were examined, and the influence of abiotic and biotic factors on the horizontal distribution of fish larvae and on the horizontal structure of the LFC was investigated. The LFC, composed of 62 taxa (59 species and 3 genera) in 28...

The 3M redfish assessment is focused on the beaked redfish, regarded as a management unit composed of two populations from two very similar species: the Flemish Cap S. mentella and S. fasciatus. The reason for this approach is the historical dominance of this group in the 3M redfish commercial catch until 2005. However a new golden redfish fishery...

Fecundity of redfish Sebastes mentella and Sebastes norvegicus in the Irminger Sea and Icelandic waters was analyzed in relation to several maternal features and oocyte developmental stages. The mean potential fecundity in S. norvegicus was estimated to be 123,300 oocytes and relative fecundity averaged 116 oocytes g–1. Mean potential fecundity in...

An Assessment of Beaked Redfish (S. mentella and S. fasciatus) in NAFO Division 3M (at times when natural mortality is driven stock dynamics and fishing mortality reference points are useless to scientific advice) Abstract The 3M redfish assessment is focused on the beaked redfish, regarded as a management unit composed of two populations from two...