期刊
ICES JOURNAL OF MARINE SCIENCE
卷 66, 期 10, 页码 2205-2210出版社
OXFORD UNIV PRESS
DOI: 10.1093/icesjms/fsp211
关键词
Atlantic bluefin tuna; eggs; jellyfish larvae; Mediterranean; spawning period; Thunnus thynnus
资金
- Spanish National Research Council (CSIC)
- Balfego Tuna S.L.
For the first time, tuna spawning in a transport cage being towed from the western Mediterranean spawning ground to a fattening facility off the coast of northeastern Spain was examined during the 2008 fishing season. Daylight and night surface plankton samples were collected using bongo nets located in front of and behind the transport cage. The results for the different time intervals revealed clear and massive nocturnal spawning from 03:00 to 05:00, when the rear bongo was completely jammed with eggs (up to 250 000-300 000 eggs per 1000 m(3)). Egg size and morphology were consistent with the features of Thunnus thynnus eggs, and identification was confirmed by genetic analysis. Microscopic examination showed the eggs to be in the very early developmental stages. Spawning took place every night over the entire journey. The study showed that neither captivity nor handling/environmental changes along the route inhibited T. thynnus spawning to a very precise biological clock. The study also revealed the diet temporal concurrence of T. thynnus spawning and jellyfish larvae at the sea surface.
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