Age class structure

Age class structure in fisheries and wildlife management is a part of population assessment. Age class structures can be used to model many populations include trees and fish. This method can be used to predict the occurrence of forest fires within a forest population. [1] Age can be determined by counting growth rings in fish scales, otoliths , cross-sections of end spines for species with thick spines such as triggerfish, or teeth for a few species. Each method has its merits and drawbacks. Fish scales are easiest to obtain, but may be unreliable if they have fallen into the sea. Spines end may be unreliable for the same reason, and most fish do not have visible weight. Otoliths will have stayed with the fish throughout its life history. Also, otoliths often require more preparation before aging.

Analyzing fisheries age class structure

An example of using age class structure to learn about population is a regular curve for the population of 1-5 year-old fish with a very low population for 3-year-olds. An age class structure with gaps in population size like the one Described Earlier Implies a bad spawning year 3 years ago fait que species.

Often fish in younger age class structures-have very low numbers Because They Were small enough to slip through the sampling net, and May in fact-have a very healthy population.

See also

  • Identification of aging in fish
  • Pyramid population
  • Population dynamics of fisheries

References

  1. Jump up^ Wagner, CE Van (1978-06-01). “Age-class distribution and the forest fire cycle” . Canadian Journal of Forest Research . 8 (2): 220-227. doi : 10.1139 / x78-034 . ISSN  0045-5067 .

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