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13. Nile Perch Population Dynamics in Lake Victoria :
0 )+(IF«.3*Fishwt[ 2]»Fishwt[14]) THEN (NP_mass[14])
ELSE 0)+ (IF «. 3 *Fishwt[2]»Fishwt[lS]) THEN
(NP_ma s s [ l S ] ) ELSE 0)+(IF«.3 *Fishwt[2 ]»Fishwt[16] )
THEN (NP_mass[16]) ELSE
0)+ (IF «.3 *Fishwt[ 2]»Fishwt[ 17] ) THEN (NP_ma s s[ 1 7 ] )
ELSE 0 )+(IF « .3 *Fishwt [2]»Fishwt[ 18]) THEN
(NP_mass[1 8 ]) ELSE 0)+(IF «. 3*Fishwt[ 2]»Fishwt[ 19] )
THEN (NP_mass[19]) ELSE
0)+(IF«.3*Fishwt[ 2]»Fishwt[20]) THEN (NP_mass[20])
ELSE 0) {quantity o f biomass which is susceptible to
cannibalism}
sus_mass [3] = (IF«.3*Fishwt[3]»Fishwt[4]) THEN
(NP_mass[4]) ELSE 0)+(IF« .3*Fishwt[3]»Fishwt[S]) THEN
(NP_mass[S]) ELSE 0)+(IF«.3*Fishwt[3]»Fishwt[6]) THEN
(NP_mass[6]) ELSE 0)+(IF«.3*Fishwt[3]»Fishwt[7]) THEN
(NP_mass[7]) ELSE 0)+(IF«.3*Fishwt[3]»Fishwt[8]) THEN
(NP_mass[8]) ELSE 0)+(IF«.3*Fishwt[3]»Fishwt[9]) THEN
(NP_mass[9]) ELSE 0)+(IF«. 3 *Fishwt[3]»Fishwt[10])
THEN (NP_ma s s[ l O]) ELSE
0 ) + ( I F « . 3 *Fi s hwt [3 ] » Fi s hwt [ 11 ] ) THEN (NP_mass[ l l])
ELSE 0)+(IF«. 3 *Fishwt[3] »Fishwt[1 2]) THEN
(NP_mass[12]) ELSE 0)+(IF«.3 *Fishwt[3 ]»Fishwt[1 3] )
THEN (NP_mass [ 13 ]) ELSE
0 )+ (IF «(.3 *F ishwt[3)>Fishwt [1 4 ) THEN (NP_ma s s [14 )
ELSE 0 )+(IF« . 3 *Fishwt [3)>Fishwt [lS ] ) THEN
(NP_mass [lS] ) ELSE 0 )+(IF «. 3 *Fishwt[3 ] »Fishwt [16 )
THEN (NP_mass[ 16] ) ELSE
0)+(IF(( .3 *Fishwt[ 3 ]»Fishwt[17]) THEN (NP_mass [17])
ELSE 0)+(IF(. 3 *Fishwt[ 3]»Fishwt[1 8]) THEN
(NP_mass[18]) ELSE 0)+(IF«(. 3 *Fishwt[ 3]»Fishwt[19])
THEN (NP_mass[ 19]) ELSE
0)+(IF((.3*F ishwt[3]»Fishwt[ 20]) THEN (NP_mass[20])
ELSE 0) {quantity of biomass whi ch is susceptible to
cannibalism}
sus_mass [4] = (IF«(.3*Fishwt[4]»Fishwt[S]) THEN
(NP_mass[S]) ELSE 0)+(IF« .3*Fishwt[4]»Fishwt[6]) THEN
(NP_mass[6]) ELSE 0)+(IF«(.3 *Fishwt[4]»Fishwt[7]) THEN
(NP_mass[7]) ELSE 0)+(IF«(.3 *Fishwt[4]»Fishwt[8]) THEN
(NP_mass[8]) ELSE 0)+(IF«(. 3 *F ishwt[ 4]»Fishwt[9]) THEN
(NP_mass[9]) ELSE 0 )+(IF(( . 3 *Fishwt[4] »Fishwt[ 10)
THEN (NP_mass[lO]) ELSE
0)+( IF(( . 3 *Fishwt [ 4)>Fishwt[1 1) THEN (NP_mass [l l] )
ELSE 0 )+ ( IF «(. 3 *F ishwt [4 ]»Fishwt[ 12 ) THEN