First attempt to assess the viability of bluefin tuna spawning events in offshore cages located in an a priori favourable larval habitat


  • Patricia Reglero Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears
  • Rosa Balbín Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears
  • Aurelio Ortega Instituto Español de Oceanografía, Centro Oceanográfico de Murcia
  • Diego Alvarez-Berastegui SOCIB, Balearic Islands Coastal Observing and Forecasting System
  • Ana Gordoa CEAB (CSIC)
  • Asvin P. Torres Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears
  • Vicenç Moltó Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears
  • Ananda Pascual IMEDEA (CSIC-UIB)
  • Fernando De La Gándara Instituto Español de Oceanografía, Centro Oceanográfico de Murcia
  • Francisco Alemany Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears



bluefin tuna, larvae, geostrophic currents, transport cage, Mediterranean


Most of the Atlantic bluefin tuna caught by the purse-seine fleet in the Mediterranean Sea are transferred alive into transport cages and towed to coastal facilities where they are fattened. This major fishery is targeting aggregations of reproductive bluefin tuna that continue spawning within the transport cages. Our study is the first attempt to assess the viability of the spawning events within transport cages placed offshore in a priori favourable locations for larval survival. The study was conducted in June 2010 in the Balearic Sea, a main spawning area for bluefin tuna in the Mediterranean. The location of two transport cages, one with wild and one with captive tuna, coincide with the situation of the chlorophyll front using satellite imagery as a proxy for the salinity front between resident surface waters and those of recent Atlantic origin. The results showed that bluefin tuna eggs were spawned almost every day within the two cages but few or no larvae were found. The expected larval densities estimated after applying mortality curves to the daily egg densities observed in the cages were higher than the sampled larval densities. The trajectories of the eggs after hatching estimated from a particle tracking model based on observed geostrophic currents and a drifter deployed adjacent to the cage suggest that larvae were likely to be caught close to the cages within the sampling dates. Spawning events in captive tuna in transport cages may hatch into larvae though they may experience higher mortality rates than expected in natural populations. The causes of the larval mortality are further discussed in the text. Such studies should be repeated in other spawning areas in the Mediterranean if spawning in cages located offshore in areas favourable a priori for larval survival is likely to be considered a management measurement to minimize the impact of purse-seine fishing on tuna.


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How to Cite

Reglero P, Balbín R, Ortega A, Alvarez-Berastegui D, Gordoa A, Torres AP, Moltó V, Pascual A, De La Gándara F, Alemany F. First attempt to assess the viability of bluefin tuna spawning events in offshore cages located in an a priori favourable larval habitat. Sci. mar. [Internet]. 2013Dec.30 [cited 2024Mar.4];77(4):585-94. Available from:




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