Skip to main content

Trophic ecology of Atlantic bluefin tuna Thunnus thynnus larvae

Buy Article:

$51.00 plus tax (Refund Policy)

Feeding intensity, diet composition, selectivity, energy ingestion and dietary niche breadth of larval Atlantic bluefin tuna Thunnus thynnus were studied on the eastern (Mediterranean) spawning grounds of the species. Larval T. thynnus were collected in the Balearic Archipelago (north-west Mediterranean Sea) during 2004 and 2005 using surveys specific for larval scombrids. Larvae between 2·6 and 8·7 mm standard length (LS) are diurnal feeders, and 94% of the guts collected during daylight hours were full. The mean ±s.d. number of prey per gut was 7·1 ± 5·7, with mean ±s.d. ranging from 3·0 ± 1·6 in the smallest T. thynnus larvae to 11·1 ± 5·8 in 5·0–6·0 mm LS larvae. Up to 21 prey were found in a single larval gut (5·0–6·0 mm LS) at the end of the day. Larvae progressively selected larger prey and exhibited increased carbon content concurrent with preflexion development of feeding and locomotory structures. Larvae of 5·0–6·0 mm LS exhibited positive selection of cladocerans over other prey (Chesson's index), whereas copepod nauplii dominated the diets of earlier stages. The dietary niche breadth measured increased initially but decreased at c. 5·5 mm LS. Appendicularians were found in the diet of larger larval sizes, but no piscivory was observed. Results are discussed in light of the sparse existing data for larval T. thynnus and other larval tuna species.
No References
No Citations
No Supplementary Data
No Data/Media
No Metrics

Keywords: diet; fish larvae; morphometry; selectivity

Document Type: Regular Paper

Affiliations: 1: Institut Mediterrani d’Estudis Avançats, CSIC-UIB, 21 Miquel Marques, CP 07190, Esporles, Illes Balears, Spain 2: IEO-Centre Oceanogràfic de Balears, Moll de ponent s/n, CP 07015, Palma de Mallorca, Illes Balears, Spain

Publication date: 2011-05-01

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more