Spatial models

In many respects, population dynamics of actual stocks are more complex than those described by simple VPA or statistical catch-age models. For example, many stocks exhibit migratory patterns that vary from year to year. In some cases, the spatial scale of migration may be such that effects on population dynamics are negligible, and in other cases, migration is a valid consideration. Many migration models have been proposed; their implementation usually requires detailed information to characterize the migratory pattern, as migrations often depend on age, size, density, or environment.

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Worm Farming

Worm Farming

Do You Want To Learn More About Green Living That Can Save You Money? Discover How To Create A Worm Farm From Scratch! Recycling has caught on with a more people as the years go by. Well, now theres another way to recycle that may seem unconventional at first, but it can save you money down the road.

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