292
13. Nile Perch Population Dynamics in Lake Victoria:
0)+(IF(Fishwt[5]>(.3*Fishwt[6]» AND (sus_mass [5]>0)
THEN(can[5]*(NP_mass[6] /sus_mass[5]» ELSE 0)
Natural_Mortality [7] = (IF(Fishwt[1]>( .3*Fishwt[7]»
AND (sus_mass [1]>0)
THEN(can[1]*(NP_mass[7] /sus_mass[1]» ELSE
0)+(IF(Fishwt[2]>(.3*Fishwt[7]» AND (sus_mass [2]>0)
THEN(can[2]*(NP_mass [7] /sus_mass[2]» ELSE
0)+(IF(Fishwt[3]>(.3*Fishwt[7]» AND (sus_mass [3]>0)
THEN(can[3]*(NP_mass[7] /sus_mass[3]» ELSE
0)+(IF(Fishwt[4]>( .3*Fishwt[7]» AND (sus_mass [4]>0)
THEN(can[4]*(NP_mass[7]/sus_mass[4]» ELSE
O)+(IF(Fishwt[5]>( .3*Fishwt[7]» AND (sus_mass [5]>0)
THEN(can[5]*(NP_mass[7] /sus_mass[5]» ELSE
0)+(IF(Fishwt[6]>( .3*Fishwt[7]» AND
THEN(can[6]*(NP_mass[7]/sus_mass[6]» ELSE 0)
Natural_Mortality [8] = (IF(Fishwt[1]>( .3*Fishwt[8]»
AND (sus_mass [1]>0)
THEN(can[1]*(NP_mass[8] /sus_mass[1]» ELSE
0)+(IF(Fishwt[2]>(.3*Fishwt[8]» AND (sus_mass [2]>0)
THEN(can[2]*(NP_mass[8] /sus_mass[2]» ELSE
0)+(IF(Fishwt[3]>( .3*Fishwt[8]» AND (sus_mass [3]>0)
THEN(can[3]*(NP_mass[8] /sus_mass[3]» ELSE
0)+(IF(Fishwt[4]>( .3*Fishwt[8]» AND (sus_mass [4]>0)
THEN(can[4]*(NP_mass[81 /sus_mass[4]» ELSE
0)+(IF(Fishwt[5]>( .3*Fishwt[8]» AND (sus_mass [5]>0)
THEN(can[5]*(NP_mass[8] /sus_mass[5]» ELSE
0)+(IF(Fishwt[6]>(.3*Fishwt[8]» AND (sus_mass [6]>0)
THEN(can[6]*(NP_mass[8] /sus_mass[6]» ELSE
0)+(IF(Fishwt[7]>(.3*Fishwt[8]» AND (sus_mass [7]>0)
THEN(can[7]*(NP_mass[8]/sus_mass[7]» ELSE 0)
Natural_Mortality [9] = (IF(Fishwt[1]>(.3*Fishwt[9]»
AND (sus_mass [1]>0)
THEN(can[1]*(NP_mass[9] /sus_mass[1]» ELSE
0)+(IF(Fishwt[2]>(.3*Fishwt[9]» AND (sus_mass [2]>0)
THEN(can[2]*(NP_mass[9] /sus_mass[2]» ELSE
0)+(IF(Fishwt[3]>(.3*Fishwt[9]» AND (sus_mass [3]>0)
THEN(can[3]*(NP_mass[9] /sus_mass[3]» ELSE
0)+(IF(Fishwt[4]>( .3*Fishwt[9]» AND (sus_mass [4]>0)
THEN(can[4]*(NP_mass[9] /sus_mass[4]» ELSE
0)+(IF(Fishwt[5]>( .3*Fishwt[9]» AND (sus_mass [5]>0)
THEN(can[5]*(NP_mass[9]/sus_mass[5]» ELSE
0)+(IF(Fishwt[6]>( .3*Fishwt[9]» AND (sus_mass [6]>0)
THEN(can[6]*(NP_mass[9]/sus_mass[6]» ELSE