A model of maximal food intake against fish size was constructed
from the data on gut contents (Fig. 5). Based on this model, it became
obvious that fish offered 1 RFL were underfed at the start of the
experiment. The question whether this feeding level remained
insufficient during the subsequent days cannot be answered directly,
because it requires knowledge on the dynamics of growth and
mortality. For each treatment and each rearing day, the number of
survivors was calculated on the basis of a constant mortality rate (see
methods), fish size was modelled from growth curves constructed
from samples at 2-day intervals, then fish body mass was backcalculated,
using the model described in the methods. Finally, fish
number and body mass were equated to determine how many nauplii
would have been needed to feed the survivors maximally on each day,
and this value was compared to the number of nauplii that was
actually distributed on this particular day. The results of this analysis
(Fig. 6) clearly indicate that, at all fish densities, the fish that were
offered 1 RFL were underfed throughout, except for the last feeding
day, and even those given 3 RFL were slightly underfed from 60 to
108 hah.
A model of maximal food intake against fish size was constructedfrom the data on gut contents (Fig. 5). Based on this model, it becameobvious that fish offered 1 RFL were underfed at the start of theexperiment. The question whether this feeding level remainedinsufficient during the subsequent days cannot be answered directly,because it requires knowledge on the dynamics of growth andmortality. For each treatment and each rearing day, the number ofsurvivors was calculated on the basis of a constant mortality rate (seemethods), fish size was modelled from growth curves constructedfrom samples at 2-day intervals, then fish body mass was backcalculated,using the model described in the methods. Finally, fishnumber and body mass were equated to determine how many naupliiwould have been needed to feed the survivors maximally on each day,and this value was compared to the number of nauplii that wasactually distributed on this particular day. The results of this analysis(Fig. 6) clearly indicate that, at all fish densities, the fish that wereoffered 1 RFL were underfed throughout, except for the last feedingday, and even those given 3 RFL were slightly underfed from 60 to108 hah.
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