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CONTENTS. 1. Introduction. 2. Preliminary data from Lake Michigan. 3. Critical processes in yoy yellow perch survival and growth-overview. 4. Critical processes in yoy survival and growth-details. 5. Simulation results - comparison with data. 6. Sensitivity analysis. 7. Steps in modelling and analyzing of input and output data. 8. Future uses of the model for yellow perch and other fish research. TABLES. 1. Sensitivity of survival and end-of-year length to hatch date. 1988 reference run, 9782 larvae, all of hatch length 5.8 mm, hatched on date specified. 2. Sensitivity to parameters PA (relating to encounters with predators) and PB (relating to larval length beyond which predation becomes rare)in subroutine PREDATE; PDEAD = PA*EXP(- PB*CL). 9782 larvae, 1988 data. 3. Sensitivity of survival and length to temperature. 1988 reference run, 9782 larvae with actual 1988 hatch distribution. 4. Sensitivity of survival and length to parameter SK in subroutine STARV. Half-life is starvation half-life, estimated only for prey and predator density set equal to 0, so that all fish starve. 9782 larvae, 1988 data. 5. Sensitivity of survival and length to parameter CB in CMAX = CW*EXP(CB). 9782 larvae, 1988 data. 6. Sensitivity of survival and length to parameter SDA in subroutine GROW. 9782 larvae, 1988 data. 7. Graphs available in LOTUS3.1 shell program FISHSHEL.WK3. FIGURES. 1. Larval distribution over time for 1988. 2. Environmental conditions: typical variation over time of prey and predator density, and temperature. 3. Lake Michigan pooled data for larval (June) and juvenile (September) lengths distribution. 4. Larval length distribution at one location and date. 13 June 1988. 5. Juvenile size distribution at one location and date. 21 September 1988. 6. Schematic of modelling one day in the life of a yoy yellow perch. 7a. Reference model run: number of surviving yoy yellow perch and their average length over the growing season for 1988. 9782 larvae. 7b. Temperature, prey, and predator densities for the growing season 1988. 8a,b. Reference model run for 9980 larvae for 1989. 9a,b. Reference model run for 9984 larvae for 1990. 10. Survival by hatch date, 1988, reference run. 11. Causes of mortality, 1988, reference run. 12. 1988 test run for one size and hatch date of larvae. 13. Survival by hatch length, 1988, reference run. 14. Reference model run, but with parameter SDA = 0.9: number of surviving yoy yellow perch and their average length over the growing season for 1988. 15. Schematic of modelling and analyzing data.

CONTENTS. 1. Introduction. 2. Preliminary data from Lake Michigan. 3. Critical processes in yoy yellow perch survival and growth-overview. 4. Critical processes in yoy survival and growth-details. 5. Simulation results - comparison with data. 6. Sensitivity analysis. 7. Steps in modelling and analyzing of input and output data. 8. Future uses of the model for yellow perch and other fish research. TABLES. 1. Sensitivity of survival and end-of-year length to hatch date. 1988 reference run, 9782 larvae, all of hatch length 5.8 mm, hatched on date specified. 2. Sensitivity to parameters PA (relating to encounters with predators) and PB (relating to larval length beyond which predation becomes rare)in subroutine PREDATE; PDEAD = PA*EXP(- PB*CL). 9782 larvae, 1988 data. 3. Sensitivity of survival and length to temperature. 1988 reference run, 9782 larvae with actual 1988 hatch distribution. 4. Sensitivity of survival and length to parameter SK in subroutine STARV. Half-life is starvation half-life, estimated only for prey and predator density set equal to 0, so that all fish starve. 9782 larvae, 1988 data. 5. Sensitivity of survival and length to parameter CB in CMAX = CW*EXP(CB). 9782 larvae, 1988 data. 6. Sensitivity of survival and length to parameter SDA in subroutine GROW. 9782 larvae, 1988 data. 7. Graphs available in LOTUS3.1 shell program FISHSHEL.WK3. FIGURES. 1. Larval distribution over time for 1988. 2. Environmental conditions: typical variation over time of prey and predator density, and temperature. 3. Lake Michigan pooled data for larval (June) and juvenile (September) lengths distribution. 4. Larval length distribution at one location and date. 13 June 1988. 5. Juvenile size distribution at one location and date. 21 September 1988. 6. Schematic of modelling one day in the life of a yoy yellow perch. 7a. Reference model run: number of surviving yoy yellow perch and their average length over the growing season for 1988. 9782 larvae. 7b. Temperature, prey, and predator densities for the growing season 1988. 8a,b. Reference model run for 9980 larvae for 1989. 9a,b. Reference model run for 9984 larvae for 1990. 10. Survival by hatch date, 1988, reference run. 11. Causes of mortality, 1988, reference run. 12. 1988 test run for one size and hatch date of larvae. 13. Survival by hatch length, 1988, reference run. 14. Reference model run, but with parameter SDA = 0.9: number of surviving yoy yellow perch and their average length over the growing season for 1988. 15. Schematic of modelling and analyzing data.