Stage- / Size-Structured Models. Fish 458, Lecture 16. Stage-Structured Models. Why not always use age-structured models: Ageing is difficult (or impossible) for several types of organisms.
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Fish 458, Lecture 16
1 – first years; 2 – small juveniles; 3 – large juveniles;
4-subadults; 5-novice breeders; 6 – first-year remigrants;
The matrix X is often constrained to prevent “negative growth” (e.g. lobsters, abalone)
Size-increment information for Tasmanian rock lobster
(note the large fraction of zero increments)
Example: rock lobster off Tasmania, Australia
Size-structured models are almost always fitted to information on population (or catch) size-structure in addition to some index of abundance