First data on growth and nucleic acid and protein content of field-captured Mediterranean bluefin (&lt;em&gt;Thunnus thynnus&lt;/em&gt;) and albacore (&lt;em&gt;Thunnus alalunga&lt;/em&gt;) tuna larvae: a comparative study

García, A.; Cortés, Dolores; Ramı́rez, Teodoro; Fehri-Bedoui, Rafika; Alemany, Francisco; Rodríguez, José María Calama; Carpena, Ángel; Álvarez, José M.

doi:10.3989/scimar.2006.70s267

Cited by 32 publications

(31 citation statements)

References 25 publications

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“…Sizedependent natural mortality rates were estimated assuming an average length growth rate of 0.35 mm d -1 (Garcia et al 2006), omitting situations with positive rates. Our field-based mortality rates for tuna were compared to the general pattern in natural mortality for marine pelagic fish larvae described by the sizedependent relationship from McGurk (1986) based on published data for different species.…”

Section: Methodsmentioning

confidence: 99%

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Cannibalism among size classes of larvae may be a substantial mortality component in tuna

Reglero¹,

Urtizberea²,

Torres³

et al. 2011

Mar. Ecol. Prog. Ser.

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Cannibalism among size classes may reduce starvation and improve survival of larval tuna in oligotrophic ocean areas, but it may also be a substantial mortality component depending on the availability of alternative prey. Here, we combine laboratory and field data on tuna larvae with a model of larval foraging and bioenergetics to explore the role of cannibalism in cohort development at different temperatures, durations of hatching period, hatching larval densities and natural mortality rates. Prey fields (zooplankton densities and co-occurrence of different larval stages of 3 species of tuna) were established from cruises in a main tuna spawning area around the Balearic Islands (Mediterranean Sea). Results suggest that a pure zooplankton diet is frequently insufficient to sustain larval growth. Piscivory can be a major source of larval mortality among tuna species and larvae hatched early can feed on abundant larvae of smaller size and have fewer predators themselves. We show how the intensity of cannibalism depends on the temperature dependent growth rate and the resulting relative size distribution when eggs are released continuously over a period of a few weeks. The predator-prey size distribution and the relative densities of these voracious larvae may produce overcompensation in recruitment under some environmental conditions.

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Section: Methodsmentioning

confidence: 99%

“…3) and simulated (lines) larval densities over time. Average densities by size from the field were transformed to densities by age using the expression of Garcia et al (2006) for the 3 species. BT: bullet tuna; ALB: albacore tuna; BFT: bluefin tuna.…”

Section: Predation Potential Among Speciesmentioning

confidence: 99%

Cannibalism among size classes of larvae may be a substantial mortality component in tuna

Reglero¹,

Urtizberea²,

Torres³

et al. 2011

Mar. Ecol. Prog. Ser.

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“…By contrast, the standard length frequency distribution of Atlantic bonito and albacore tuna shows the absence of individuals smaller than 3.5 mm, about one day old (Garcia et al 2006, Sarropoulou et al 2014. Most Atlantic bonito larvae were between 6.6 and 7.5 mm (5 to 7 days old [Sarropoulou et al 2014]) and most albacore larvae were between 4.6 and 5.5 mm (10 to 14 days old [Garcia et al 2006]).…”

Section: Larval Population Structurementioning

confidence: 89%

“…Most Atlantic bonito larvae were between 6.6 and 7.5 mm (5 to 7 days old [Sarropoulou et al 2014]) and most albacore larvae were between 4.6 and 5.5 mm (10 to 14 days old [Garcia et al 2006]). These results explain the high average sizes calculated for these two species: 6.62±0.79 mm and 4.9±1 mm, respectively.…”

Section: Larval Population Structurementioning

confidence: 99%

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Characterization of the spawning area of tuna species on the northern Tunisian coasts

et al. 2016

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Summary:Early life stages of tuna species were investigated along the northern coasts of Tunisia in the summer of 2010, from 7 to 14 July. A total of 74 stations, distributed on a regular grid, were sampled. Larvae of five tuna species were identified: the Atlantic bluefin tuna, the bullet tuna, the Atlantic black skipjack, the Atlantic bonito and the albacore tuna. Larval distribution patterns show that Atlantic bluefin tuna and albacore tuna usually spawn in offshore oligotrophic waters and Atlantic black skipjack larvae on the continental shelf. The widespread distribution of bullet tuna larvae, suggests that it spawns on the entire continental shelf and over the shelf break. The results from the quotient analysis carried out to characterize the spawning habitat of each species, show that the input of recent surface Atlantic water (AW) masses play a key role in the spawning strategy of tuna species, particularly in the case of the Atlantic bluefin tuna, whose larvae were mainly caught in the mixed waters resulting from the interaction between recent AW and resident AW, as demonstrated by their preference for salinity values between 36.9 and 37.4.Keywords: tuna larvae; environmental variables; spatial distribution; spawning area; water masses; Mediterranean. Caracterización del área de puesta de especies de túnidos en las costas del norte de TúnezResumen: Se investigaron las fases larvarias tempranas de especies de túnidos a lo largo de las costas del norte de Túnez, durante el verano de 2010, del 7 al 14 de julio. Se muestrearon un total de 74 estaciones, distribuidas en una malla regular. Se identificaron larvas de cinco especies: el atún rojo, la melva, la bacoreta, el bonito y el atún blanco. Los patrones de distribución de larvas muestran que el atún rojo y el atún blanco desovan generalmente en aguas oligotróficas alejadas de la costa. Por contra, la localización relativamente más costera de las larvas de bacoreta indica que esta especie se reproduce sobre la plataforma continental, mientras que la amplia distribución de las larvas de melva sugiere que esta especie desova a lo largo de toda la plataforma y el margen continental. Los resultados del análisis de proporcionalidad, llevado a cabo para caracterizar el hábitat de puesta de cada especie, muestran que la entrada de masas de agua superficial atlántica (AW) reciente juegan un papel clave en la estrategia de desove de las especies de túnidos, sobre todo en el caso del atún rojo, cuyas larvas fueron capturadas principalmente en las aguas de mezcla, resultantes de la interacción entre el AW reciente y la residente, como lo demuestra su preferencia por los valores de salinidad entre 36.9 y 37.4.Palabras clave: larvas de túnidos; variables ambientales; distribución espacial; área de puesta; masas de agua; Mediterráneo.

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The Bluefin Tuna Fishery in the Bay of Biscay

Cort

Abaunza

2019

SpringerBriefs in Biology

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A brief description is made of the Atlantic bluefin tuna, Thunnus thynnus (L.), from the point of view of its biology, geographic distribution and population dynamic. With the Strait of Gibraltar traps as a reference and providing a vision from ancient times to the present, scientific activities on this fishing gear are reviewed in an attempt to explain the reasons behind the crisis of the catches in this fishery, which began at the beginning of the 1960s and which has been extended until recent times. In order to do so and based on a recent publication on the issue, the Bay of Biscay fishery is presented as a fishery with a long tradition on which numerous scientific studies have been carried out and whose data are of great importance in the ABFT assessment group of SCRS (ICCAT's scientific committee). Traditionally, the catches of this fishery have been made up of juvenile specimens (<40 kg) making up more than 97% in number of fishes according to a 62-year series studied (1949-2010). From an analysis of the population, it has been shown that the impact of massive fishing of juveniles in this fishery between 1949 and 1962, together with that of juveniles in Morocco (the Atlantic part) possibly caused the decline of the traditional traps fishery of spawners in the Strait of Gibraltar and the collapse of the spawner fisheries in the north of Europe from the 1960s. This situation continued until 2007, the year from which a Pluri-Annual Recovery Plan (PARP) was adopted by ICCAT for the eastern stock. Since the PARP was implemented, juvenile catches have disappeared from almost all the fisheries, a scenario that coincides with a considerable recovery of the spawning stock biomass in the easter Atlantic and Mediterranean, according to the results of the latest SCRS assessments. Keywords Atlantic Bluefin Tuna Á Traps Á Strait of Gibraltar Á Bay of Biscay Á Juveniles Fishing xi Chapter 1

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First data on growth and nucleic acid and protein content of field-captured Mediterranean bluefin (<em>Thunnus thynnus</em>) and albacore (<em>Thunnus alalunga</em>) tuna larvae: a comparative study

Cited by 32 publications

References 25 publications

Cannibalism among size classes of larvae may be a substantial mortality component in tuna

Cannibalism among size classes of larvae may be a substantial mortality component in tuna

Characterization of the spawning area of tuna species on the northern Tunisian coasts

The Bluefin Tuna Fishery in the Bay of Biscay

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