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- Title
Stochastic growth.
- Authors
Gudmundsson, Gudmundur
- Abstract
Environmental variations in food and temperature induce substantial irregular variations in the growth of many living organisms. In fisheries research, stochastic growth has been modelled by adding a random term to deterministic growth functions. This entails large fluctuations in individual growth paths, including spells of negative growth. A different approach to modelling stochastic growth is presented where the anomalous short-term behaviour is avoided. The third moment of length distributions contains valuable information for the formulation of growth models. The size distribution of actual stocks is modified by size-dependent mortality. New methods for estimation of growth functions, taking this effect into account, are presented, requiring less specific assumptions about the properties of growth and stochastic variations than previous methods. Actual length distributions are also affected by genetic variability. The effects of this upon the development of second and third moments of length distributions with age differ depending on whether they are associated with maximum length or growth.
- Subjects
ORGANISMS; FISH populations; FISHES; FISHERIES; FISHING
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2005, Vol 62, Issue 8, p1746
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/F05-074