That the
ratoon gives a better SGR is not surprising, it is the
period that most resembles traditional rice culture:
few inputs, a lot of weeds and higher water levels. O.
niloticus, B. gonionotus and C. carpio also show
higher SGR values in the ratoon period (N.
Vromant, unpublished data). We estimate that, for
a fish cycle of 10 months, fish typically remain
3 months in the trench, 5 months in the rice crop
and 2 months in the ratoon. Under these conditions,
T. pectoralis culture is very difficult.
That theratoon gives a better SGR is not surprising, it is theperiod that most resembles traditional rice culture:few inputs, a lot of weeds and higher water levels. O.niloticus, B. gonionotus and C. carpio also showhigher SGR values in the ratoon period (N.Vromant, unpublished data). We estimate that, fora fish cycle of 10 months, fish typically remain3 months in the trench, 5 months in the rice cropand 2 months in the ratoon. Under these conditions,T. pectoralis culture is very difficult.
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