Journal of Wildlife Diseases (1993)
In 1990, 74 dusky dolphins (Lagenorhynchus obscurus) and 10 Burmeister's porpoises (Phocoena spinipinnis) were examined for the presence of hyperpigmented marks and pinhole lesions on the skin (tattoo lesions) at…
External morphology of Dall’s porpoise (Phocoenoides dalli): Growth and sexual dimorphism
Amano, Masao; Miyazaki, Nobuyuki
Canadian Journal of Zoology (1993)
We studied development and sexual dimorphism in external measurements of Dall's porpoises (Phocoenoides dalli) from the northwestern North Pacific. Relative rates of increase in the measurements of the head and…
Abundance estimates of Pacific white-sided dolphin, northern right whale dolphin, Dall’s porpoise and northern fur seal in the north Pacific, 1987-1990
Buckland, S.T.; Cattanach, K.L.; Hobbs, R.C.
Bulletin of the International North Pacific Fisheries Commission (1993)
Line transect analysis was applied to the 1987-1990 North Pacific marine mammal sightings survey data, with a regression adjustment for size-biased sampling of schools. Abundance of Pacific white-sided dolphins is…
Preliminary winter abundance estimates for cetaceans along the California coast based on a 1991 aerial survey
Forney, K. A.; Barlow, J.
Report of the International Whaling Commission (1993)
We present the results of an aerial line transect census of cetaceans along the California coast during March and April 1991. This survey was the first of two aerial surveys…
Interactions between cetaceans and gillnet and trap fisheries in the Northwest Atlantic
Read, A. J.
Report of the International Whaling Commission (1994)
Gillnet and trap fisheries of the Northwest Atlantic and their potential for cetacean entanglement are reviewed. Ten major categories of passive fisheries are identified, five of which are known to…
The potential for reducing entanglement of dolphins and porpoises with acoustic modifications to gillnets
Dawson, S. M.
Report of the International Whaling Commission (1994)
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…
Cetaceans of the northern Gulf of California: Distribution, occurrence, and relative abundance
Silber, Gregory K.; Newcomer, Michael W.; Silber, Patricia C.; Perez-Cortes M., Hector; Ellis, Graeme M.
Marine Mammal Sci (1994)
A total of 1,715 km of boat-based surveys and 1,521 km of aircraft-based surveys was conducted from 1986–1989 to assess the distribution, relative abundance, and ecological relationships of cetaceans in…
Morphometric comparison of the epidermis in several cetacean species
Jones, F. M.; Pfeiffer, C. J.
Aquatic Mammals (1994)
Epidermal thickness and relative papillary height of the skin from the urogenital region were compared with values from the ventral aspect of the flipper and the mid-dorsal body wall. Data…
A note on artisanal fisheries interactions with small cetaceans in Mexico
Zavala-Gonzalez, A.; Urban-Ramirez, J.; Esquivel-Macias, C.
Report of the International Whaling Commission (1994)
Between 1982 and 1993, 55 coastal locations throughout Mexico were visited to investigate mortality of small cetaceans. A total of 139 records concerning the use of small cetaceans by fishermen…
Estimates of incidental marine mammal bycatch in California gillnet fisheries for July through December, 1990
Lennert, C.; Kruse, S.; Beeson, M.; Barlow, J.
Report of the International Whaling Commission (1994)
Data are reported on marine mammal mortality collected from California's gillnet fisheries for California halibut and Pacific angel shark (set net) and swordfish and pelagic sharks (driftnet) during the first…