Investigations on Cetacea (1982)
In the Piti Mouth, a typical biotope of Sousa plumbea and Neophocaena phocaenoides in the Indus delta, the sounds produced by Johnius belangerii (Boro) and the rather weaker crustacean sounds…
In the Piti Mouth, a typical biotope of Sousa plumbea and Neophocaena phocaenoides in the Indus delta, the sounds produced by Johnius belangerii (Boro) and the rather weaker crustacean sounds…
Information on the movement of cetaceans in relation to survey vessels is important for determining if abundance and density estimates from ship-based line transect sighting surveys are biased. A ship-based…
To reduce incidental catch of cetaceans in gillnets, two forms of acoustic modifications are reviewed here; one to make gillnets more reflective to cetacean sonar, and another using active sound…
The harbour porpoise (Phocoena phocoena) is the only cetacean incidentally caught in significant numbers by the Danish fishing fleet and there is some concern that the populations in Danish waters…
Dall's porpoises, Phocoenoides dalli, were often incidentally caught in the Japanese salmon gillnet fishery in the North Pacific. In order to investigate the reasons for entanglement, their auditory characteristics and…
Harbour porpoises are widely distributed in the seas around Denmark. Total abundance in Danish waters is estimated as approximately 100,000 animals. Population density varies considerably by area. There are probably…
The reported decline of the harbour porpoise in the coastal areas of the North Sea after 1940, has also been seen in Dutch waters. Information on the distribution and abundance…
This paper summarises current knowledge of the three populations of harbour porpoises in US and Canadian Atlantic waters. During the summer, the populations are centred in the Gulf of Maine/Bay…
Bycatch of harbour porpoises (Phocoena phocoena) occurs in most gillnet fisheries throughout the continental shelf area in the Northern Hemisphere. A few behavioural studies have attempted to ascertain the detection…
The most serious danger to dolphins and porpoises around the world is the threat from various forms of gill-net fishing. One potential way to reduce the number of deaths of…