Preliminary Notes on the Occurrence and Exploitation of Smaller Cetacea in Greenland

1975 ◽  
Vol 32 (7) ◽  
pp. 1079-1082 ◽  
Author(s):  
Finn O. Kapel
Keyword(s):  
Minke Whale ◽  
Annotated Bibliography ◽  
Delphinapterus Leucas ◽  
Phocoena Phocoena ◽  
Balaenoptera Acutorostrata ◽  
White Whale ◽  
Monodon Monoceros ◽  
Pilot Whales ◽  
By Catch

Approximately 1000 common or harbour porpoises (Phocoena phocoena) are taken annually, not including the by-catch in salmon driftnets. Catches of narwhal (Monodon monoceros) and beluga (white whale, Delphinapterus leucas) fluctuate in the low to middle hundreds annually. Estimates of the annual catches in the Thule district are 100 beluga and 300 narwhals. Sporadic catches of long-finned pilot whales (Globicephata melaena) seldom exceed 100 animals per annum. Catches of minke whale (Balaenoptera acutorostrata) have risen since the late 1950s, with approximately 200 or more per annum taken in West Grenland since the mid 1960s. An annotated bibliography of titles on smaller Cetacea in Greenland is given.

Observations on Distribution and Intraspecific Variation in Pigmentation Patterns of Odontocete Cetacea in the Western North Atlantic

1973 ◽  
Vol 30 (8) ◽  
pp. 1111-1130 ◽  
Author(s):  
M. C. Mercer
Keyword(s):  
Intraspecific Variation ◽  
North Atlantic ◽  
Intraspecific Variability ◽  
Delphinapterus Leucas ◽  
Phocoena Phocoena ◽  
Western Atlantic ◽  
Stenella Coeruleoalba ◽  
West Greenland ◽  
Monodon Monoceros

This paper comprises sight records for nine species and morphometries, color descriptions, and miscellaneous notes on the food and parasites of seven species of small odontocetes observed from West Greenland to Florida 1967–72. Of interest are the first western Atlantic extralimital record of Monodon monoceros, first Newfoundland records of Stenella coeruleoalba, and extralimital records of Delphinapterus leucas from Newfoundland. Intraspecific variability is described in the pigmentation patterns of Phocoena phocoena.

Marking of Small Cetaceans Using "Discovery" Type Whale Marks

1975 ◽  
Vol 32 (7) ◽  
pp. 1237-1240 ◽  
Author(s):  
S. G. Brown
Keyword(s):  
Minke Whale ◽  
Orcinus Orca ◽  
Killer Whales ◽  
Balaenoptera Acutorostrata ◽  
Lagenorhynchus Obscurus ◽  
Minke Whales ◽  
Beaked Whales ◽  
Pilot Whales ◽  
Dusky Dolphin

All smaller cetaceans known to have been successfully marked with "Discovery" type marks are summarized. These include 67 minke whales (Balaenoptera acutorostrata), 33 killer whales (Orcinus orca), 30 pilot whales (Globicephala sp.), 7 bottlenose whales (Hyperoodon sp.), 5 other "beaked whales," and 1 dusky dolphin (Lagenorhynchus obscurus). Recoveries include 3 minke, 1 bottlenose, and 1 killer. Minke whale marks were recovered up to 4 yr 2 mo after marking.

scholarly journals Harbour porpoises (Phocoena phocoena) and minke whales (Balaenoptera acutorostrata) observed during land-based surveys in The Minch, north-west Scotland

2013 ◽  
Vol 94 (6) ◽  
pp. 1185-1194 ◽  
Author(s):  
Sarah J. Dolman ◽  
Nicola K. Hodgins ◽  
Colin D. MacLeod ◽  
Graham J. Pierce ◽  
Caroline R. Weir
Keyword(s):  
Minke Whale ◽  
Harbour Porpoise ◽  
Phocoena Phocoena ◽  
Balaenoptera Acutorostrata ◽  
Sea State ◽  
Marine Fauna ◽  
Monitoring Method ◽  
North West ◽  
Minke Whales ◽  
Cetorhinus Maximus

The waters off north-west Scotland are known to provide important habitat for the harbour porpoise (Phocoena phocoena) and the minke whale (Balaenoptera acutorostrata). Between October 2008 and April 2011, systematic land-based surveys were carried out to assess the seasonal occurrence, group size and group behaviours of both species in a study area located off Melvaig, near Gairloch. Data were collected on 47 separate days, with a total of 4543 minutes of survey effort (in sea states ≤3) recorded during the spring months and 8204 minutes of effort during the autumn. A total of 189 sightings of marine fauna were recorded, comprising 126 cetacean sightings, 50 seal sightings and 13 sightings of basking sharks (Cetorhinus maximus). Six species of cetacean were identified, with most sightings comprising harbour porpoise (N = 72) or minke whale (N = 38). Harbour porpoise abundance was higher in autumn than in spring and there was a variation between years in numbers of minke whales sighted. In porpoises, sea state and cloud cover both influenced sightings and increasing sea state influenced survey area. Foraging behaviour was exhibited in 13% of harbour porpoise sightings and 34% of minke whale sightings. Results demonstrate a regular occurrence of harbour porpoises and minke whales in nearshore waters off Gairloch. Densities are comparable to boat surveys in the region and so support the use of land-based watches as a potential longer-term monitoring method for these species in coastal waters. Given the regular use of this area by these two European Protected Species, as well as the occurrence of a range of human activities potentially affecting them in the region, it may be appropriate to consider protecting this area for their conservation.

Aerial surveys of cetaceans in the Gulf of St. Lawrence in 1995 and 1996

1998 ◽  
Vol 76 (8) ◽  
pp. 1529-1550 ◽  
Author(s):  
MCS Kingsley ◽  
R R Reeves
Keyword(s):  
Humpback Whales ◽  
Delphinapterus Leucas ◽  
Line Transect ◽  
Balaenoptera Acutorostrata ◽  
North Shore ◽  
The North ◽  
Minke Whales ◽  
Fin Whales ◽  
Pilot Whales ◽  
Blue Whales

Aerial line-transect surveys of cetaceans were flown in the Gulf of St. Lawrence in late August and early September of 1995 and in late July and early August of 1996. Systematic north-south transects were spaced 15prime of longitude apart. In 1995, the study area comprised the entire Gulf, divided into three strata for analysis; 69% was flown. In 1996, a single stratum covered only the north shore shelf; 75% of the design was flown. The survey platform was a light high-winged aircraft with bubble windows flown at 213 m (700 ft). Ten species were seen. Minke whales (Balaenoptera acutorostrata), Atlantic white-sided dolphins (Lagenorhynchus acutus), and harbour porpoises (Phocoena phocoena) yielded enough sightings to support good estimates, while fin whales (Balaenoptera physalus), humpback whales (Megaptera novaeangliae), white-beaked dolphins (Lagenorhynchus albirostris), and long-finned pilot whales (Globicephala melas) yielded few sightings and unreliable estimates. Blue whales (Balaenoptera musculus) and belugas (Delphinapterus leucas) were seen too rarely to support any analysis. The tenth species was a small delphinid, not positively identified. Minke whales were ubiquitous, but more common in the northern strata. We estimated about 1000 in the whole Gulf in 1995 and about 600 in the northernmost stratum in 1996 (these numbers, and those following, are uncorrected for visibility bias). We estimated about 12 000 Atlantic white-sided dolphins in the Gulf in 1995, but in 1996 saw hardly any, perhaps because we flew the survey earlier. Harbour porpoises (12 000 in 1995 and 21 000 in 1996) were most numerous in the northern stratum, but were also widely distributed at lower densities in the central and southern Gulf. White-beaked dolphins (2500 in 1995 and 2500 in 1996) occurred only in the Strait of Belle Isle and the extreme northeastern Gulf. We estimated a few hundred fin whales in the northern and central strata and about 100 humpbacks, mostly in the northeast. Long-finned pilot whales were only seen in the southeastern Gulf, surveyed only in 1995 (about 1500).

Incidence of a Parasitic Ascarid, Porrocaecum decipiens, in the Common Porpoise, Phocoena phocoena, from the Lower Bay of Fundy

1958 ◽  
Vol 15 (1) ◽  
pp. 1-4 ◽  
Author(s):  
D. M. Scott ◽  
H. D. Fisher
Keyword(s):  
Nova Scotia ◽  
Reproductive Organs ◽  
Delphinapterus Leucas ◽  
Bay Of Fundy ◽  
Phocoena Phocoena ◽  
White Whale ◽  
Important Host ◽  
The Common

Examinations were made of nematodes from the stomachs of 150 common porpoises (Phocoena phocoena) collected from 1952 to 1956 from the lower Bay of Fundy, one common porpoise from St. Ann's Bay, Nova Scotia, and one white whale, (Delphinapterus leucas) from Mace's Bay, New Brunswick.One adult Porrocaecum was found. Larval Porrocaecum in numbers ranging from 1 to 21 were found in about 25% of 50 porpoise stomachs collected in 1955 and 1956. Eighty larval Porrocaecum were present in the stomach of the white whale. No trace of reproductive organs was observed in any of the larval Porrocaecum.It is concluded that the common porpoise in the lower Bay of Fundy is not an important host of adult P. decipiens.

New genetic evidences for distinct populations of the common minke whale (Balaenoptera acutorostrata) in the Southern Hemisphere

Polar Biology ◽  
2021 ◽  
Author(s):  
Lucas Milmann ◽  
Mioko Taguchi ◽  
Salvatore Siciliano ◽  
Júlio E. Baumgarten ◽  
Larissa R. Oliveira ◽  
...  
Keyword(s):  
Southern Hemisphere ◽  
Minke Whale ◽  
Balaenoptera Acutorostrata ◽  
The Common ◽  
Common Minke Whale

Histological Observation of the Proper Gastric Gland in Minke Whale, Balaenoptera acutorostrata

2003 ◽  
Vol 65 (3) ◽  
pp. 423-426 ◽  
Author(s):  
Tetsuya SHIMOKAWA ◽  
Daishiro YAMAGIWA ◽  
Eiichi HONDO ◽  
Shigetoshi NISHIWAKI ◽  
Yasuo KISO ◽  
...  
Keyword(s):  
Gastric Gland ◽  
Minke Whale ◽  
Histological Observation ◽  
Balaenoptera Acutorostrata

scholarly journals Automatic Sorting of Dwarf Minke Whale Underwater Images

Information ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 200 ◽  
Author(s):  
Dmitry A. Konovalov ◽  
Natalie Swinhoe ◽  
Dina B. Efremova ◽  
R. Alastair Birtles ◽  
Martha Kusetic ◽  
...  
Keyword(s):  
False Negative ◽  
False Negative Rate ◽  
Minke Whale ◽  
Balaenoptera Acutorostrata ◽  
Classification Rate ◽  
Near Surface ◽  
Photo Identification ◽  
Video Footage ◽  
Positive Classification ◽  
June July

A predictable aggregation of dwarf minke whales (Balaenoptera acutorostrata subspecies) occurs annually in the Australian waters of the northern Great Barrier Reef in June–July, which has been the subject of a long-term photo-identification study. Researchers from the Minke Whale Project (MWP) at James Cook University collect large volumes of underwater digital imagery each season (e.g., 1.8TB in 2018), much of which is contributed by citizen scientists. Manual processing and analysis of this quantity of data had become infeasible, and Convolutional Neural Networks (CNNs) offered a potential solution. Our study sought to design and train a CNN that could detect whales from video footage in complex near-surface underwater surroundings and differentiate the whales from people, boats and recreational gear. We modified known classification CNNs to localise whales in video frames and digital still images. The required high classification accuracy was achieved by discovering an effective negative-labelling training technique. This resulted in a less than 1% false-positive classification rate and below 0.1% false-negative rate. The final operation-version CNN-pipeline processed all videos (with the interval of 10 frames) in approximately four days (running on two GPUs) delivering 1.95 million sorted images.

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