PCWA-L 480.pdf - PCWA Middle Fork American River Project ...

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Getting Started
2.4 Starting Bioenergetics
TD start Fish BIDenergetics 3.0, simply dDuble click the Fish Bioenergetics 3.0 icon located In the
Bioenergetics group (Windows 3.1) or the Program menu under the Start button (Windows '95 or
NT).
2.5 Sample Data and Bioenergetics Run
2·4
All Df the examples used in the foliDwing chapters pertain to the simulatiDn (PERCH.RUN) of a
hYPDthetical yellDw perch populatiDn living h Lake Perea. The data represent a cDhDrt of age-3
perch which grDw from 60 g on June 1 (Simulation day 1) to 90 g on May 31 of the fDIlDwing year.
The initial perch pDpulation size is 10,000 with a natural mortality rate Df 30% per year, and a
harvest mortality rate Df 25% during the fishing seaSDn (June 1 tD OctDber 1'5) (PERCH.MOR).
The diet (PERCH.DIE) gradually changes frDm all invertebrates on June 1 to all fish on December
1 with the perch remaining exclusively piscivDrDus tD the end of the year. The energy density of .
. both predator (PERCH.PDC) and prey (PERCH.PYC) remain constant throughout the year. The
perch reside In a temperate lake where seasonal water temperatures range from 4 DC in the
Winter to 23 DC in the summer (PERCH.TEM). Industrial development has polluted the waters of
Lake Perea such that the perch population accumulates PCBs from their diet (PERCH.PYX) at a
constant aSSimilation efficiency of (PERCH.AEX). In addition, these perch act as a vector for
nitrogen and phosphorus transport between the littoral zone (Where they consume their prey) and
the open lake. Files describing the nitrogen and phosphorus content Df the perch (PERCH.PDN
and PERCH,PDP) and their prey (PERCH.PYN and PERCH.PYP), and the gross assimilation
efficiency (PERCH.AEN and PERCH.AEP) are proVided.