Monitoring growth and energy utilisation of the harbour porpoise (Phocoena phocoena) in human care

  • Christina Lockyer Danish Institute for Fisheries Research, DK 2920 Charlottenlund Current address: Age Dynamics, Huldbergs Alle 42, DK 2800 Lyngby
  • Geneviève Desportes Fjord&Bælt, DK 5300 Kerteminde
  • Kirstin Hansen Fjord&Bælt, DK 5300 Kerteminde
  • Sabrina Labberté Fjord&Bælt, DK 5300 Kerteminde, Denmark Current address: Via Nurra 82, 09046 Quartu S.E., Sardinia, Italy
  • Ursula Siebert Forschungs- und Technologiezentrum Westkueste, Christian Albrechts University of Kiel, 25761 Buesum
Keywords: harbour porpoises, growth, energy utilisation

Abstract

Two harbour porpoises of an estimated age of 1-2 years were held in captivity from April 1997 and were still alive in April 2002, after rescue from pound nets set in inner Danish waters. They are presently housed in an outdoor penned-off area of Kerteminde fjord. Their growth (total body length, girth, body weight and blubber thickness) and daily dietary intake (weight of fish, dietary composition and energy value) have been monitored since capture. The general activity of the animals was regularly monitored, including two 24-hour long observation periods. 
Initial body weights were 37.5 kg for Eigil (male) and 40.5 kg for Freja (female). Both porpoises lost 4 to 5 kg in the first few days because of their initial refusal to feed from the hand. Then body weight increased steadily reaching a peak of 44.75 kg for Eigil and 51.6 kg for Freja in early February 1998. A fluctuation in body weight with peaks of 44 to 45 kg for the male and 51to 56 kg for the female in winter followed by lows of 41 to 44 kg and 47 to 48 kg respectively in summer, established a clear pattern of seasonal fluctuation, mirrored by girth and blubber thickness variation. Length increased steadily from 130.5 cm to 139cm in Eigil, and from 127.5 cm to 150 cm in Freja. Food intake also fluctuated seasonally, and increases in food intake preceded weight gains. Daily food consumption in Eigil and Freja represented about 7 to 9.5% of body weight.
The growth of the animals resembles that of wild porpoises in the region. The sudden initial weight losses suggested that the energy reserves of the animals may only be short-term. The large weight increase in the winter months with colder water, correlating with the increase in girth and blubber thickness, suggest that energy reserves and blubber fat may be important for insulation. During the two 24-hour observations, the animals spent most of their time cruising around, although slow swimming and logging at the surface increased at night. Breathing rates were lower in the early morning hours, consistent with diminished activity. Both animals’ movements were influenced by external activities at poolside.
Published
2003-07-01
How to Cite
LockyerC., DesportesG., HansenK., LabbertéS., & SiebertU. (2003). Monitoring growth and energy utilisation of the harbour porpoise (<i>Phocoena phocoena</i&gt;) in human care. NAMMCO Scientific Publications, 5, 107-120. https://doi.org/10.7557/3.2743