小林, 由美; 條野, 真奈美; 後藤, 陽子; 服部, 薫; 桜井, 泰憲
To examine the distribution of Steller sea lions Eumetopias jubatus and other marine mammals and their impact on coastal fisheries (destruction of fishing gear and decreased fish catches) in the western Oshima peninsula, Hokkaido, Japan, a questionnaire survey was carried out, and a collection of photographic records and analyses of by-catch and stranding samples obtained
February-May, 2008 was generated. There are eleven small haul-out sites for Steller sea lions observed along the coast of the Sea of Japan. Seven by-catch and stranding records of Steller sea lions and Northern fur seals Callorhinus ursinus were obtained, and two samples were collected. It has been suggested...
三谷, 曜子; 岡崎, 宏美; 関口, 圭子; 宮下, 和士
Killer whales Orcinus orca are cosmopolitan in distribution, but study sites are restricted to small geographic areas, primarily shore-based and boat-based studies focusing on nearshore areas. To contribute understanding about the biology of killer
whales in pelagic areas, we created photographic identification catalogue of killer whales sighted during T/S Oshoro-maru cruise to the northern North Pacific, Bering Sea and Chukchi Sea in 2003, 2005-2009. For 6 years, 37 groups were found, containing 182 whales, and 29 individuals were identified from left side photos of dorsal fin. No individual was re-sighted within-year, nor between-year. And no matches were found between killer whales observed in Alaska, Russian...
Odani, Kenji; Imamura, Hisashi
Examination of taxa closely related to the family Leptoscopidae resulted in 61 apomorphic characters recognized within the family, based on morphological comparisons with the suborder Percoidei, the following being determined as autapomorphic for the former: U-shaped arrangement of infraorbitals; dermosphenotic fused with sphenotic; laminar process present on dorsal
surface of ethmoid; medially-directed palatine process; and adductor mandibulae section A1 with two tendons inserted laterally and medially onto maxilla. In addition, presence of the rectus dorsalis 3 muscle (rare among Perciformes), is also considered to
support leptoscopid monophyly. The trachinoid family Creediidae was the inferred sister group of Leptoscopidae, based on the sharing...
Homma, Tomoe; Yamaguchi, Atsushi; Bower, John R.; Imai, Ichiro
To evaluate vertical changes in the abundance, biomass, and community structure of copepods and their effect on material
flux, stratified samples were collected at 15 discrete depths between 0 and 3,000 m with a fine mesh size (60 μm) Vertical Multiple
Plankton Sampler in the southern Bering Sea and northern North Pacific on 14 and 16 June 2006. Both copepod abundance
and biomass decreased with increasing depth, and both decreases were described well with a power model. A total of 72 calanoid
copepod species belonging to 34 genera and 15 families were identified in the Bering Sea and 63 species belonging to 32