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BITON Sebastien
sebastien.biton
mio.osupytheas.fr
00486090528
| Curriculum Vitae: |
PhD Oceanography (Aix-Marseille University, France)
MSc Marine Environment (UMC, Madrid, Spain)
BSE Oceanography and Marine resources (UPC, Barcelona, Spain) |
Activités de Recherche: |
| Biological oceanographer. Fisheries science. Ocean Engineering. Biology, Ecology and Conservation of pelagic sharks (shortfin mako Isurus oxyrinchus, blue shark Prionace glauca and Greenland shark Somniosus microcephalus). Sustainable management of fish resources. |
Programme de Recherche/CV: |  |
Domaines de Recherche: - Sciences de l'environnement/Biodiversité et Ecologie
- Sciences du Vivant/Biologie animale/Zoologie des vertébrés
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Productions scientifiques :
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Hooks equipped with magnets can increase catches of blue shark (Prionace glauca) by longline fishery 
Auteur(s): Biton S.
(Article) Publié:
Fisheries Research, vol. p.172 (2015) 345–351 (2015)
Ref HAL: hal-01238512_v1
DOI: 10.1016/j.fishres.2015.07.016
Exporter : BibTex | endNote
Résumé: Blue shark (Prionace glauca) populations are decreasing worldwide and the species is currently classified as near threatened. However, it is the main species caught by the Spanish and Portuguese longline fisheries; and blue shark is specifically targeted by a part of these fleets in the northeastern Atlantic Ocean. Sharks are well known to be able to detect electric fields in the microvolt range and this sense has been proposed to provide a mechanism to detect the earth’s magnetic field. As a result, the use of magnets has been proposed as a method to reduce shark interactions with fishing gear. We therefore tested two models of high field strength neodymium magnets to effect shark catch rates during commercial longline fishing operations. Our results show that magnets do not reduce blue shark catch rates and can even have an attractive effect. This effect was significantly higher for the larger magnet model tested(26 mm × 11 mm × 12 mm, 0.885 T) compared to the smaller one (20 mm × 13 mm × 15 mm, 0.464 T). We also noted that hooks remain magnetized after removal of the magnets and are even slightly magnetized without any previous contact with a magnet.
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DNA evidence of the consumption of short-beakedcommon dolphin Delphinus delphis by the shortfinmako shark Isurus oxyrinchus
Auteur(s): Biton S.
(Article) Publié:
-Marine Ecology Progress Series, vol. p.532: 177–183, 2015 (2015)
Ref HAL: hal-01238515_v1
DOI: 10.3354/meps11327
Exporter : BibTex | endNote
Résumé: Stomachs of shortfin mako sharks Isurus oxyrinchus caught in the northeastern Atlantic by Iberian longliners were analyzed. A number of juveniles, 6 out of 96 individuals with non-empty stomachs, had consumed marine mammals. The remains (skin, fat, vertebrae and flesh with the dorsal fin) were not identifiable at species level by non-genetic methods. Portions of themitochondrial DNA control region and of the gene coding for cytochrome b were therefore sequenced. Both the short-beaked common dolphin Delphinus delphis and possibly the striped dolphin Stenella coeruleoalba were identified. Shortfin makos are able to consume marine mammals almost as large as themselves. Well-preserved D. delphis were juveniles.
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