Arrays of hydrophones were deployed within the Bransfield Strait and Scotia Sea (Antarctic Peninsula region) from 2005 to 2009 to record ambient ocean sound at frequencies of up to 125 and 500 Hz. Icequakes, which are broadband, short duration signals derived from fracturing of large free-floating icebergs, are a prominent feature of the ocean soundscape. Icequake activity peaks during austral ...

The blue shark (Prionace glauca) is a large pelagic carcharhinid that is widely distributed in the world’s oceans. Throughout its range, it is considered the most abundant species of large shark (McKenzie and Tibbo, 1964; Casey, 1982). In the Atlantic, the blue shark is distributed from Newfoundland to Argentina in the west and Norway to South Africa, including the Mediterranean, in the east (C...

The Station ALOHA Cabled Observatory (ACO) is an ocean-bottom observatory that allows continuous real-time monitoring of ocean processes including sounds produced by baleen whales. Baleen whales can be challenging to study using traditional visual methods due to their cryptic behavior and offshore ranges. Many baleen whales produce distinctive sounds that propagate well under water and so ocean...

A study of the trophic biology of 87 blue marlin caught in Hawaiian waters indicates that these opportunistic predators consume a diverse array of prey. The data suggest that the diet of blue marlin is influenced by the locality of capture. Thus, surface (troll)-caught blue marlin from near the Hawaiian Islands consume numerous larvae, postlarvae, and juveniles ofinshore species, prey relativel...

Blue colored topaz is the most commercialized gemstone worldwide at present. Very rare in nature, most of these topazes are treated by laboratory irradiation with gamma ray, neutron or electron, or in combination with them ever since more than 30 years ago. Knowledge about the origin of the blue color in topazes is not well understood, and a method to identify blue topaz nondestructively is a w...

Motivated by Ward & Myers (2005) that claimed higher impact of longline fishery on large pelagic community including blue shark, long-term comparison of shark CPUE were made using recent and historical data collected by Japanese research and training vessels in the western North Pacific. Standardized species combined shark CPUE (predominated by blue shark catch and assuming that the shark combi...