
E. Rodríguez-MarínInstituto Español de Oceanografia | IEO · Centro Oceanográfico de Santander
E. Rodríguez-Marín
Senior researcher of Spanish Public Research Organizations. Ph.D. (Biology) Universidad Complutense de Madrid, 2002
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Publications (86)
Changing environmental temperatures impact the physiological performance of fishes, and consequently their distributions. A mechanistic understanding of the linkages between experienced temperature and the physiological response expressed within complex natural environments is often lacking, hampering efforts to project impacts especially when futu...
Controversies remain regarding the periodicity, or seasonality, of otolith growth band formation, which directly influences a correct age determination of Atlantic bluefin tuna using this structure. The aim of this work was to apply marginal increment analysis and marginal edge analysis to determine the timing of band deposition. The index of compl...
We fit growth models to back-calculated size-at-age data for Atlantic bluefin tuna (Thunnus thynnus) captured in the western Atlantic management area to inform alternative growth scenarios within the current management framework of the species. The Modified-Fry function was the best-performing of three back-calculation functions based on a leave-on...
An otolith ageing bias for juvenile Atlantic bluefin tuna was detected at the 2017 population assessment. Consequently, revised reading criteria were proposed to reduce this ageing bias. To evaluate standardized and revised reading criteria, age estimates were compared to reading and radiocarbon age estimates. Age estimates showed a lack of bias an...
In the last Atlantic bluefin tuna assessment, an age-length database coming from direct ageing was presented for the first time. It was observed that otolith age estimates for fish younger than 8 years old had a smaller size at age compared to spine (first dorsal fin radius) age estimates. This difference, although small, was enough to misallocate...
Previous studies comparing calcified structures for swordfish ageing established that otoliths and anal fin rays are the most suitable hard parts. Despite otoliths are considered the better structure, their tiny size represents the main difficulty for its use. Fin rays have also some disadvantages, in which the bone remodelling is the most remarkab...
Uncertainty regarding the movement and population exchange of Atlantic bluefin tuna (Thunnus thynnus) from the two primary spawning areas (Gulf of Mexico, Mediterranean Sea) is increasingly implicated as a major impediment for the conservation of this species. Here, two mixture methods were applied to natural chemical markers (δ¹⁸O and δ¹³C) in oto...
Megrim (Lepidorhombus whiffiagonis) is a commercially important European flatfish which population assessment requires reliable age and growth information. An extensive sampling of nearly 10000 otoliths over 25 years has been collected during annual bottom trawl surveys in southern Bay of Biscay and Galician waters. Samples were aged and yearly age...
Identification of the first annual increments in otoliths of Atlantic bluefin tuna juveniles is difficult due to the frequent appearance of numerous sub-annual bands which can be easily misinterpreted. Instead, the pattern of deposition of the annuli on the first dorsal fin rays (spines) is very distinct during the first years. Furthermore, the bia...
Otolith reading bias for juvenile Atlantic bluefin tuna was detected at its 2017 assessment. To try to reduce this bias, the current standardized reading protocol was revised. The new protocol uses age estimates from the first dorsal fin ray (spine) to identify the growth increments in the otoliths removed from the same young specimen. An exchange...
This paper analyzes the available direct ageing information for Atlantic bluefin tuna caught in the eastern management area. Historical fin spine readings were incorporated into the biological database, after having established that the age estimation was equivalent to that performed following the standardized methodology. This allows having a data...
Growth models describe the change in length or weight as a function of age. Growth curves in tunas can take different forms from relatively simple von Bertalanffy growth curves (Atlantic bluefin, albacore tunas) to more complex two- or three-stanza growth curves (yellowfin, bigeye, skipjack, southern bluefin tunas). We reviewed the growth of the pr...
https://doi.org/10.1016/j.fishres.2016.08.009
[This corrects the article DOI: 10.1371/journal.pone.0141478.].
The compiled data for this study represents the first Atlantic and Mediterranean-wide effort to pool all available biometric data for Atlantic bluefin tuna (Thunnus thynnus) with the collaboration of many countries and scientific groups. Biometric relationships were based on an extensive sampling (over 140,000 fish sampled), covering most of the fi...
The growth of bluefin tuna (Thunnus thynnus) in the North-eastern Atlantic and Mediterranean was analysed using the back-calculation of the dorsal fin spine annuli. Spines from a total of 2678 bluefin tuna, collected from 1984 and 1990–2010, were analyzed. The specimens ranged from 45 to 287 cm straight fork length (SFL). Both linear and power regr...
Between 2009 and 2013, the head region of 102 juveniles of Atlantic bluefin tuna (Thunnus thynnus L.) caught in four nursery areas of the Mediterranean Sea (Balearic Sea, Ionian Sea, Ligurian Sea and Tyrrhenian Sea) were analysed for parasites. Eleven parasite species were found: Capsala magronum, C. onchidiocotyle, C. paucispinosa, Nasicola klawei...
The diet of young Atlantic bluefin tuna (Thunnus thynnus) in the Bay of Biscay foraging ground was assessed using stomach-content analysis (SCA) and stable-isotope analysis coupled with isotope mixing model. Whereas SCA showed that the young tuna fed mainly on horse mackerel (Trachurus trachurus), the estimation of liver and muscle mixing model ana...
This study deals with important methodology issues that affect age estimates of eastern Atlantic bluefin tuna Thunnus thynnus using dorsal fin spines. Nearly 3800 spine sections were used from fish caught in the north-east Atlantic Ocean and western Mediterranean Sea over a 21 year period. Edge type and marginal increment analyses indicated a yearl...
This study evaluated age estimates from a bluefin tuna otolith collection for bias, precision and compared age estimates to the most recent growth curve (Restrepo et al. 2010). Overall, ageing error was low and within the acceptable APE and CV (10%) for quality control. However, all readers exhibited a consistent bias in ageing larger fish (CFL>180...
A first growth function was estimated for the South Atlantic swordfish stock. A total of 406 anal fins were collected from 2006 to 2013. Fins were classified into three types and the most common, type A, was selected. Biometric relationships among several ray section measurements and lower jaw fork length were analysed. A detailed methodological de...
Stomach content analysis (SCA) and stable isotope analysis (SIA) coupled
with isotopic mixing model analysis were used to estimate diet
composition of pre-spawning Atlantic bluefin tuna (ABFT), Thunnus
thynnus, caught by trap in the Strait of Gibraltar area. SCA provided
poor information on diet as most of the stomachs appeared empty or
contained o...
Information of most of fish species on Flemish Cap is presented, based on the results of the EU surveys in July from 1988 to 2002. It includes: survey catches in weight and number, mean weight, length-weight relationship, length distribution, mean age at length (when available) and bathymetric distribution.
Atlantic bluefin tuna (Thunnus thynnus) are highly migratory predators whose abundance, distribution, and somatic condition have changed over the past decades. Prey community composition and abundance have also varied in several foraging grounds. To better understand underlying food webs and regional energy sources, we performed stomach content and...
Atlantic bluefin tuna (Thunnus thynnus) are highly migratory predators whose abundance, distribution, and somatic condition have changed over the past decades. Prey community composition and abundance have also varied in several foraging grounds. To better understand underlying food webs and regional energy sources, we performed stomach content and...
CONTEXT : Anchovy natural (predation) mortality is potentially high and variable and is key in anchovy population dynamics / recovery OBJECTIVE : Map the consumption requirements of predators of anchovy to understanding the spatio-temporal dynamics of predation on anchovy DATA AVAILABLE • Internationally coordinated fisheries surveys (DCF / ICES) :...
Standardized CPUEs were estimated through a General Linear Modeling (GLM) approach under a negative binomial error distribution assumption. RÉSUMÉ Des indices d'abondance relative de thon rouge (Thunnus thynnus) capturé par des madragues espagnoles et marocaines dans la zone proche du détroit de Gibraltar ont été estimés pour la période allant de 1...
Atlantic bluefin tuna (Thunnus thynnus) are highly migratory predators whose abundance, distribution, and somatic condition have changed over the past decades. Prey community composition and abundance have also varied in several foraging grounds. To better understand underlying food webs and regional energy sources, we performed stomach content and...
This study analyzes the evolution of the abundance of bluefin tuna spawners (group 5+) in the Bay of Biscay and since the beginning of the 1970s. Using information since 1970, a sharp fall is observed in the abundance of group 5+ fishes (mainly age 5+, 62 kg mean weight), in a fishery in which there has been a clear dominance of juveniles over the...
Nowadays many different marine animals are being tagged. This book summarizes recent tagging programs carried out by the Spanish Institute of Oceanography (IEO). Although the objectives of these various studies mainly depend on the species and each project in particular, the general aim is to better understand the biology and ecology of these anima...
Skin and gill parasites found in juvenile Atlantic bluefin tuna (Thunnus thynnus) caught in the Bay of Biscay, northeast Atlantic, were examined with the aim of finding biological tags. The degree of infection of different microhabitats was analyzed and the annual prevalence by species of parasite obtained. Of the specimens examined, 98% had parasi...
Our understanding of the biology of Atlantic bluefin tuna (Thunnus thynnus) has in-creased profoundly in the last decade, and the progress is attributed to the development and application of a variety of novel tools. Here we provide a comprehensive examina-tion of available data on the life history and stock structure of T. thynnus by re-examining...
SUMMARY This report provides the presentations, discussions and conclusions from the ICCAT bluefin tuna workshop for direct ageing held in Santander, Spain, in April 2006. The report summarizes the ageing criteria used in the past and the agreements on future age determination based on otoliths, vertebrae and spines. Advantages and disadvantages of...
SUMMARY In this paper we provide the results of an ageing comparison analysis between vertebrae and spines of bluefin tuna collected from longline fisheries in the south waters of Island in 2001- 2004. A total of 100 vertebrae an 100 spines were aged from the same specimen. The range of aged specimens is from 4 to 17 years old. Both calcified struc...
SUMMARY This paper is aimed at reviewing the information from previous bluefin tuna (Thunnus thynnus) tagging research activities in order to plan future conventional tagging surveys, the identification of the ideal tagging areas and seasons for the purposes of describing and quantifying movements between the birth, wintering and feeding areas of b...
This thesis describes the resource partitioning of decapod crustaceans by demersal fishes in the Cantabrian Sea. The study is based on the analysis of the stomach contents from over 6 500 individuals of 10 fish species, and shows the importance of decapod curstaceans in the diet of the most abundant demersal fishes in the Cantabrian Sea and that th...
SUMMARY This study presents an age-length key and the mean lengths at age of bluefin tuna obtained through the reading of sections of dorsal spines. The spines correspond to large individuals collected using traps in the province of Cádiz on the southwest coast of Spain. Estimated mean lengths at age are compared with those obtained in other studie...
Relative indices of abundance by age class for bluefin tuna from 1975 to 2000 were estimated using generalized linear mixed models. Age class was included as a fixed factor within the model specifications, with the Year x Age interaction as a fixed factor component in order to obtain annual indices by age. Catch and effort data on bluefin tuna were...
Roughhead grenadier Macrourus berglax Lacépède 1802, is becoming an important commercial fish in the north-west Atlantic fisheries and reliable age information is needed for its assessment. Macrourus berglax has been aged by counting otolith growth zones assumed to represent anulli. Three validation methods were applied: back-calculation of length-...
The catch at age of eastern Atlantic bluefin tuna (Thunnus thynnus) juveniles caught in the in the Bay of Biscay between 1990 and 1999 was estimated using three methods: Age-length key by spine reading, length-frequency analysis by the Multifan statistical model and by the Age slicing deterministic model. No significant differences were found (P<0....
Since 1998 European Union has conducted an annual bottom trawl survey in Flemish Cap (NAFO Div. 3M) in the 200-720 m depth range. Roughhead grenadier (Macrourus berglax) is considered a target species within this project and its population structure is being studied. A review of the information on roughhead grenadier recorded during the last 7 EU s...
The European Union has conducted a random-stratified bottom trawl survey in Flemish Cap (NAFO Div. 3M) in the 200-720 m depth range. Age-length key, length composition, age composition, sex-ratios, distribution of captures and total biomass estimated by the swept area method for roughhead grenadier (Macrourus berglax) are presented. Age and length...
Two specimens of the Suborder Ceratioidei are described, a female of Himantolophus mauli Bertelsen and Krefft, 1988. and a female of Caulophryne jordani Goode and Bean. 1896. Both were found on Flemish Cap bank east of Newfoundland, NAFO Div. 3M, in February 1992. Both represent the second most northerly records in the Northwest Atlantic and the fi...
Variations in feeding according to predator size, depth and month were studied by on-board analysis of commercially caught fish in 1992. Fish (39%), cephalopods (32%), and decapod crustaceans (22%) were the main items, with cannibalism reaching 2%. An abrupt change in diet composition occurred in fish between 60 and 69cm, from feeding on decapod cr...
During the fishery assessment survey Cantabrico 91 carried out in N Spanish waters in autumn 1991, 3370 stomachs of 20 demersal fish species were analysed. Prey were determined from the stomach contents to distinguish predator diet in relation to length. The results obtained are compared with those of previous years, and it is confirmed that the de...
In this paper the biometric relationships between the different body parts of decapods are described, allowing the reconstruction of size and biomass (weight) of each sample from its hard parts (chelae and cephalothorax). The usefulness of this study lies in the interpretation of the feeding habits of demersal fish which feed on decapod crustaceans...
A tagging cruise was carried out in Flemish Cap between February 20th and March 9th. A total of 433 cod were tagged. Length/weight relationships have been calculated through biological sampling for cod and American plaice. Sex-ratio and maturity by length and age have been studied for both sexes of cod. Sex-ratio and maturity by length have been st...