41 research outputs found
Tagging and recapture activities carried out by the Spanish Confederation of Responsible Recreational fishing (ceprr) with the Scientific Coordination of the Spanish Institute of Oceanography (IEO) in the Mediterranean (2008-2011)
During the 2008-2011 period, 1548 specimens of tuna and tuna-like species were tagged by the
Spanish Confederation of Responsible Recreational Fishing (CEPRR) with the scientific
coordination of the Spanish Institute of Oceanography (IEO). Of these, 1031 bluefin tuna were
tagged with conventional tags, whereas 10 other specimens of the same species were tagged
with pop-up satellite electronic tags in the Mediterranean. Five pop-up electronic tags
remained on the adult specimens up to 110 days. In this period, the specimens stayed in the
tagging area except for one of them, which reached Algerian waters in the winter. Similarly,
333 long-finned tuna and up to 184 specimens belonging to other species such as swordfish,
little tunny, bonito, frigate tuna and spearfish, were also tagged. Eight bluefin tuna were
recaptured, including one adult tuna which was found in the same area where it was tagged
(Balearic Islands) 1343 days after release. A juvenile tuna tagged in the Mediterranean was
recaptured more than two years after release in the Cantabrian Sea. Over the 2008-2011
period, the IEO provided a number of training courses on conventional and electronic tagging
techniques at the different ports where tournaments and/or tagging and release campaigns
were carried out. This promoted participation of the CEPRR in the tagging design of the
GBYP-ICCAT Atlantic-wide Research Programme on Bluefin Tuna, as well as strategic and
scientific interest.Postprin
Análisis de los resultados de las Campañas de marcado de Atún rojo (Thunnus thynnus) del “Tagging GBYP-ICCAT 3ª Fase realizadas en el Golfo de León y Estrecho de Gibraltar durante 2011-12
In the Gulf of Lion Campaign 109 bluefin were tagged with conventional tags measuring
between 74 cm and 108 cm fork length (LH). Five of these specimens had an electronic mark
mini-patt placed on them. The campaign of the Strait of Gibraltar took place from 5/10/12 to
21/11/12 with 117 days at sea with a total of 1,477 bluefin marked of which 1,432 copies were
marked, mainly with a double mainstream brand mark, 20 individuals with an electronic type
pop-up (mini-pat) and 25 more fish with internal electronic tags. The tagged fish measured
between 70 cm and 130 cm fork length (LH). Likewise, the biological samples which were
scheduled were obtained for more than 40 samples of bluefin tuna of all sizes.Postprin
Campañas de marcado de atún rojo juvenil (Thunnus thynnus) juvenil coordinadas por el IEO, previstas en el Programa ICCAT-GBYP y realizadas en el Estrecho de Gibraltar durante Noviembre de 2011 y enero de 2012
This paper presents the results of conventional tagging surveys on juvenile bluefin tuna
conducted in the Strait of Gibraltar during different periods of 2011 and 2012 with two vessels
from the port of Algeciras that usually fish using pole and bait in that area. The campaigns
were carried out within the framework of the Enhanced Research Program for Bluefin Tuna
(Thunnus thynnus) (GBYP). In 36 days of activity, a total of 1389 bluefin tuna were tagged,
weighing an average of approximately 15 kg, ranging between 7 and 40 kg. In 46% of the
specimens, two different tags were placed, and the forecasts established in the Tagging Plan
within the ICCAT-GBYP were achieved.GBYP-ICCATPostprin
Posible influencia sobre el comportamiento migratorio del atún rojo (Thunnus thynnus) de las distintas estrategias de marcado electrónico utilizadas en las almadrabas y en jaulas de engorde
The Spanish Institute of Oceanography has been carrying out diverse research projects since
1997 on stock structure and on migration patterns of bluefin tuna (Thunnus thynnus), using the
method of electronic tagging of adults. The results are provided to the stock assessment process
of this species that the ICCAT Scientific Committee conducts periodically. The tagging is
carried out in traps and fattening cages, observing marked differences in the movements of
tunas that were tagged in the water from those that were brought on board for tagging. In the
latter case, differences were also observed in the behavior of tunas that were released outside
the codend of the trap from those that were released together with the rest of the shoal that was
in the trap. With regard to the tagging and release of tunas in the fattening cages, it was
observed that the behavior after tagging is related to time the tunas spent in the farming
installations. The conclusion was reached that this type of tagging affects the natural behavior
of bluefin tuna in the first phase, after which they continue with their normal biological cycle
and their return to the natural habitat.En prens
El atún blanco (Thunnus alalunga) del Mediterráneo occidental
The situation of the Spanish fishery of albacore (Thunnus alalunga) in the western
Mediterranean during the last years is presented. Catch data, fishing effort, CPUEs and size
distributions are presented by gear and spatial-time strata. The mean annual catch of albacore
in the last ten years reaches 310 MT, which makes a temporary alternative fishing method to
the longline fisheries of swordfish. The finding of spawning areas around the Balearic Islands
and the information from CPUE analyses by strata, in the future, could contribute, from a
qualitative point of view, to important biological information of the species in the western
Mediterranean.Le présent document fait état de la situation de la pêcherie espagnole de germon (Thunnus
alalunga) dans l’ouest de la Méditerranée au cours de ces dernières années. Les données de
capture, l’effort de pêche, les CPUE et les distributions de tailles sont présentés par engin et
par strate spatio-temporelle. La capture annuelle moyenne du germon ces dix dernières années
a atteint 310 t, ce qui offre aux pêcheries palangrières d’espadon une alternative temporaire.
L’existence de zones de frai autour des îles Baléares et l’information que fourniront les futures
analyses de CPUE par strate spatio-temporelle et par engin de pêche pourraient apporter, d’un
point de vue qualitatif, d’importantes informations biologiques sur l’espèce dans l’ouest de la
Méditerranée.Se expone la situación de la pesquería española del atún blanco (Thunnus alalunga) durante los
últimos años en el Mediterráneo Occidental. Se presentan datos de captura, esfuerzo, CPUEs y
distribuciones de tallas por arte y estrato espacio-temporal. La captura media anual de atún
blanco para los últimos diez años alcanza las 310 Tm., lo que supone una alternativa temporal
a la pesca de pez espada con palangre de superficie. La existencia de áreas de reproducción en
torno al archipiélago Balear, unido a la información aportada por futuros análisis de CPUE
por estrato espacio-temporal y arte de pesca, podrían aportar, desde el punto de vista
cualitativo, importante información biológica sobre la especie en el Mediterráneo Occidental
Resultados de la encomienda de la SGP al IEO para el estudio del atún rojo (Thunnus thynnus) del stock del Atlántico este (que incluye el Mediterráneo) considerando las almadrabas españolas como observatorios científicos
During the years of 2010-2012 was a research project bluefin tuna traps using Spanish as
scientific laboratories. The main objective was to keep the knowledge of the tendency of the
index of abundance of bluefin tuna caught with these nets, and it is the most significant index
used in the stock assessment process East Atlantic, including the Mediterranean.
Likewise studies were developed bluefin tuna biological parameters such as growth, feeding,
reproduction, stock structure and migration patterns, the results provide an important advance
in the understanding of the biology and behavior of this species.Versión del edito
STANDARDIZED CATCH RATES FOR MEDITERRANEAN SWORDFISH (XIPHIAS GLADIUS LINNAEUS, 1758) FROM THE SPANISH LONGLINE FISHERY. 1988-2018
Standardized relative abundance indices for swordfish (Xiphias gladius Linnaeus, 1758) caught
by the Spanish surface longline in the western Mediterranean Sea were estimated for the period
1988-2018. Standardized CPUEs in number were estimated through a General Linear Mixed
Modeling (GLMM) approach under a negative binomial (NB) error distribution assumption.
Standardized CPUEs in biomass were estimated through a General Linear Mixed Modeling
(GLMM) approach under a log-normal error distribution assumption. The main factors in the
standardization analysis were fishing area and time of the year (quarter). The standardized
indices showed notable annual fluctuations without any definite trend for the period under studyEn prens
STANDARDIZED CATCH RATES OF ALBACORE (THUNNUS ALALUNGA BONNATERRE, 1788) IN THE SPANISH RECREATIONAL FISHERY IN THE WESTERN MEDITERRARREAN IN THE PERIOD 2005-2019
Catch and effort data from the Spanish recreational fishery in the Balearic Sea (Western
Mediterranean) were analysed to estimate an index of relative abundance for albacore for the
years 2005-2019. Standardized catch per unit effort (CPUE) in number were estimated through
a General Linear Mixed Modeling (GLMM) approach under a negative binomial (NB) error
distribution assumption. Nominal catch rates and a standardized abundance index are
presented along with estimates of 95% confidence limits of the predicted means. These indices
show an upward trend from the start of the series 2005 peaking in 2013; followed by a decrease
until 2015. For the latest four-year period (2016-2019), the index shows a relatively stable
trend fluctuating around a level two times lower than the maximum abundance recorded in the
time series.En prens
El cine como herramienta de aprendizaje
Memoria ID-316. Ayudas de la Universidad de Salamanca para la innovación docente, curso 2013-2014
Estudio de la madurez y fecundidad de Coryphaena hippurus, en el mar de Alborán - Mediterráneo occidental
La llampuga Coryphaena hippurus (Linnaeus, 1758) también conocida como dorado o lirio es una
especie epipelágica migratoria ampliamente distribuida en aguas tropicales y subtropicales. Esta
especie es de gran interés tanto para las pesquerías comerciales como para las deportivas en
múltiples países a nivel mundial. Las llampugas son reproductores parciales con periodos de puesta
que se extienden durante varios meses en aguas cálidas preferentemente de 21-30ºC. En este trabajo
se emplearon ejemplares capturados por la pesca deportiva en campeonatos de pesca de altura
celebrados en aguas del Mediterráneo, concretamente en el mar de Alborán, durante nueve años
(2011-2019) en los meses de agosto y septiembre. El análisis del sex ratio de 70 individuos (57 –
114 cm) mostró una mayor proporción de hembras que de machos (2:1). Un total de 45 ovarios
fueron clasificados macroscópicamente, de los cuales 30 fueron examinados histológicamente. Las
estimas de la fecundidad por tandas de 10 hembras (58 – 101 cm) varío entre 104179 y 1231207
ovocitos hidratados con una media de 686495 ± 409088 ovocitos hidratados. El análisis del índice
gonadosomático y el examen de las gónadas (macroscópico y microscópico) ponen de manifiesto
que el mar de Alborán es una zona de puesta para la llampuga