Rising ocean temperatures are causing marine fish species to shift spatial distributions and ranges, and are altering predator-prey dynamics in food webs. Most documented cases of species shifts so far involve relatively small species at lower trophic levels, and consider individual species in ecological isolation from others. Here, we show that a large highly migratory top predator fish specie...

Yellowfin tuna (Thunnus albacares) are known to preferentially occupy the surface mixed layer above the thermocline and it has been suggested that they are physiologically restricted to water temperatures no more than 8 ◦C colder than surface waters. However, we here report for dive data acquired from a large yellowfin tuna which demonstrate for the first time that this species is indeed capabl...

Ninety-one albacore tuna (Thunnus alalunga) captured during the 2003 commercial fishing season were tested for total mercury content in muscle tissue. The fish were harvested between 32.72°N (off Southern California) and 48.30°N (off the northern tip of Washington) between July and November. Fish weighed from 3.14 to 11.62 kg and were 50.8-86.4 cm long. Total mercury content in the albacore mus...

Two anionic trypsins (A and B) were purified to homogeneity from yellowfin tuna (Thunnus albacores) spleen by a series of column chromatographies including Sephacryl S-200, Sephadex G-50 and DEAE-cellulose. Purity was increased to 70.6- and 91.5-fold with approximately 2.8% and 15.6% yield for trypsin A and B, respectively. The apparent molecular weight of both trypsins was estimated to be 24 k...

Current stock assessments of western Atlantic bluefin tuna (Thunnus thynnus) use age-structured population analyses, but the age assignment in the population model is made using an age–length relationship derived from mark and recapture studies largely completed during the 1970s. In our study, the deposition of bomb radiocarbon was used as a dated mark to validate age inferences of bluefin tuna...

Tuna (Thunnus sp.) merupakan jenis ikan laut pelagis yang termasuk dalam keluarga Scombroidae. Salah satu produk atau olahan dari tuna adalah cube beku. Tujuan penilitian ini untuk mengetahui mutu, rantai dingin, rendemen dan produktivitas peoduk Pengujian mutu bahan baku beku meliputi pengujian organoleptik, mikrobiologi (Angka Lempeng Total, Salmonella, Vibrio cholerae, Escherichia coli, Coli...

The purpose of this project is to examine the potential of using tuna hard parts as natural markers to refine our understanding of population structure of tropical tuna. Yellowfin tuna (Thunnus albacares) were selected for study as tagging data and recent studies suggest that the movement patterns of yellowfin may be highly variable and more restricted than other tunas. Hawaiian yellowfin provi...