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Hilkka Ndjaula

Hilkka Ndjaula

Dr Hilkka Ndjaula

Hilkka returned to the region from Bergen, Norway where she completed her PhD degree early 2009. Keywords such as stock-recruitment relationships, stock reproductive potential, population recruitment dynamics, fish life-history, time series analyses, fecundity, oocyte development, histological analyses, intrinsic rate of population growth, spawning stock biomass estimation as well as recruitment successes of commercially exploited sub-tropic fish stocks aptly describe her research interest. Her research is often conservation oriented and seeks to bridge the gap between fundamental and applied science. She mainly strives to enhance the understanding of marine resources population dynamics and variability at individual, stock, population and ecosystem levels, and for conservation and sustainable management of natural resources and the environment. In her spare time, she enjoys community activities that aim for capacity building.

Hilkka is currently working on a project titled: ‘Population dynamics of small pelagic in the Southern Benguela’. In this project, her work involves – research into the latitudinal distribution and dynamics of reproduction of sardine in the southern Benguela with respect to variability and changes in the environment; identification of proxies for reproductive potential of commercially exploited small pelagic fish stocks in the Benguela; and research into the possible difference in stock-recruitment dynamics of sardine at South Africa’s south vs. west coasts, explicitly including environmental variability and change. The project also include the research question of possible increased energy expenditure at the south coast, building on existing metabolic models and dietary aspects.

Alongside this project, Dr. Ndjaula is collaborating with scientists at fisheries research institutions in South Africa (MCM), Namibia (NatMIRC), Angola (INIP), Norway (IMR and UIB), UK-Scotland (University of Berdeen), and USA (Department of Wildlife and Fisheries Sciences, South Dakota State Universit and University of Wyoming) in various diciplins including research on Sardine, Horse Mackerel, and Herring, on histology and body condition related work for reproductive biology studies.

Contact Details

Department of Zoology
University Avenue
University of Cape Town
Rondebosch, 7701, RSA
Ph: # (0)21 650 3613
E-mail: Hilkka.ndjaula(at)

Selected publications

  1. Ndjaula HON., Nash Richard D.M., Slotte Aril, Johannessen Arne and Olav S. Kjesbu. (2010). Long-term changes in total egg production of Norwegian spring-spawning herring Clupea harengus (L.) – Implications for variations in population structure and condition factor. Fisheries Research, 104: 19-26.
  2. Ndjaula, H.O.N. 2009. Reproductive traits and recruitment variability of pelagic fish resources: combining experimental approaches and time series analyses. Ph.D. thesis, University of Bergen, Bergen, Norway.
  3. Ndjaula HON, Hansen T., Krüger-Johnsen, M., and Kjesbu, OS (2009). Oocyte development in captive Atlantic horse mackerel Trachurus trachurus. ICES Journal of Marine Science, 66: 623-630.
  4. Ndjaula HON, Krakstad J-O and Kjesbu OS (in review) Reproductive biology of horse mackerel Trachurus capensis and Trachurus trecae in Namibia and Angola. African Journal of Marine Sciences
  5. Ndjaula, HON, Marshall CT, Nash RDM and Kjesbu OS (in review) Cohort-specific rates of population growth for Norwegian spring-spawning herring.
  6. Ndjaula HON., (2004): Fecundity, maturity and determination of reproductive potential of female rock lobster Jasus lalandii in Namibian waters: Implications for stock recovery, Thesis, Department of Fisheries and Marine Biology, University of Bergen, Norway, 128pp.
  7. Grobler, C. A. F. and HON Ndjaula, (2001). Namibian Jasus lalandii recruitment: size, weight and growth of pueruli and early juveniles. Marine and Freshwater Research 52(8): 1277- 1281.