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Summary
In 2014, two humpback whales (Megaptera novaeangliae),
a mother and her calf, were regularly observed in the inner
Danish waters and the Baltic throughout summer and au-
tumn. A third whale was apparently observed near Helsinki,
Finland, only one day before one or two humpback whales
were observed near the Danish island of Møn. Covering a dis-
tance of more than 950 km in just one day is highly unlikely
given known cruising speeds of humpback whales (between
4.8 and 14 km/h). Hence, if the observation in Helsinki is cor-
rect, there must have been three humpback whales present.
Neither of the two humpback whales was registered in the
photo identification catalogue containing more than 8,000 in-
dividuals from the North Atlantic. The two whales may have
come from the Cape Verde islands, where the population has
been increasing in recent years. North Atlantic humpback
whale stocks have generally experienced a substantial recov-
ery, and the species has also become more abundant in adja-
cent North Sea waters, and it might thus also be expected to
occur more commonly in Danish waters in the future.
The observations of the humpback whales were reported
by local sailors and people at the beaches to the Fisheries
and Maritime Museum and the website The
involvement of the public in collecting information on the
occurrence and behaviour of marine mammals, termed citi-
zen science, is a suitable and low-cost way of data harvest-
ing which at the same time serves to increase public aware-
ness of marine mammals.
År J F M A M J J A S O N D
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
Tabel 1. Månedlig fordeling af observationer af pukkelhvaler i
danske farvande. De fleste observationer gøres i sommerhalvåret.
Grøn afgiver observation af pukkelhval, med rød angiver stran-
ding af pukkelhval.
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