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13. Nile Perch Population Dynamics in Lake Victoria :
0)+(IF((.3*Fishwt[6]»Fishwt[14]) THEN (NP_mass[14])
ELSE 0)+(IF(( .3*Fishwt[6]»Fishwt[15]) THEN
(NP_mass[15] ) ELSE 0)+(IF(( .3*Fishwt[6]»Fishwt[16])
THEN (NP_mass[16]) ELSE
0)+(IF((.3*Fishwt[6]»Fishwt[17]) THEN (NP_mass[17])
ELSE 0)+(IF((.3*Fishwt[6]»Fishwt[18]) THEN
(NP_mass[18]) ELSE 0)+(IF((.3*Fishwt[6]»Fishwt[19])
THEN (NP_mass[19]) ELSE
O)+(IF(( .3*Fishwt[6]»Fishwt[20]) THEN (NP_mass[20])
ELSE 0) {quantity of biomass which is susceptible to
cannibalism}
sus_mass [7] = (IF((.3*Fishwt[7]»Fishwt[8]) THEN
(NP_mass[8]) ELSE 0)+(IF(( .3*Fishwt[7]»Fishwt[9]) THEN
(NP_mass[9]) ELSE 0)+(IF(( .3*Fishwt[7]»Fishwt[10])
THEN (NP_mass[lO]) ELSE
O)+(IF(( .3*Fishwt[7]»Fishwt[11]) THEN (NP_mass[ll])
ELSE O)+(IF(( .3*Fishwt[7]»Fishwt[12]) THEN
(NP_mass[12]) ELSE 0)+(IF(( .3*Fishwt[7]»Fishwt[13])
THEN (NP_mass[13]) ELSE
0)+(IF((.3*Fishwt[7]»Fishwt[14]) THEN (NP_mass[14])
ELSE 0)+(IF(( .3*Fishwt[7]»Fishwt[15]) THEN
(NP_mass[15]) ELSE 0)+(IF(( .3*Fishwt[7]»Fishwt[16])
THEN (NP_mass[16]) ELSE
0)+(IF((.3*Fishwt[7]»Fishwt[17]) THEN (NP_mass[17])
ELSE 0)+(IF(( .3*Fishwt[7]»Fishwt[18]) THEN
(NP_mass[18]) ELSE 0)+(IF((.3*Fishwt[7]»Fishwt[19])
THEN (NP_mass[19]) ELSE
0)+(IF(( .3*Fishwt[7]»Fishwt[20]) THEN (NP_mas s[20])
ELSE 0) {quantity of biomass which is susceptible to
cannibalism}
sus_mass [8] = (IF(( . 3*Fishwt[8]»Fishwt[9]) THEN
(NP_mass[9]) ELSE O)+(IF((.3*Fishwt[8]»Fishwt[10])
THEN (NP_mass[lO]) ELSE
0)+(IF(( .3*Fishwt[8]»Fishwt[11]) THEN (NP_mass[ll])
ELSE 0)+(IF(( .3*Fishwt[8]»Fishwt[12]) THEN
(NP_mass[12]) ELSE 0)+(IF((.3*Fishwt[8]»Fishwt[13])
THEN (NP_mass[13]) ELSE
O)+(IF((.3*Fishwt[8]»Fishwt[14]) THEN (NP_mass[14])
ELSE O)+(IF((.3*Fishwt[8]»Fishwt[15]) THEN
(NP_mass[15]) ELSE O)+(IF(.3*Fishwt[8]»Fishwt[16])
THEN (NP_mass[16]) ELSE
0)+(IF((.3*Fishwt[8]»Fishwt[17]) THEN (NP_mass[17])
ELSE 0)+(IF(( .3*Fishwt[8]»Fishwt[18]) THEN