9.6.2 Metabolism Alteration
As can be seen, Fig. 9.3 shows the results from an experiment in which metabolism
were measured. This experiment consists in three different densities and its effect
on tilapia oxygen consumption. It is possible to see that a maximum peak of
consumption was found during the dark period, 02:00 h. Studies on tilapia
metabolism show contrary results compared with results obtained under greenhouse
culture. According to Ross and McKinney (1988), during the light period oxygen
consumption is higher than dark period. However, under hypoxic conditions Tilapia
acquires the oxygen gasping at the water surface, which leads to spend extra energy.
Also this behavior could be supported with the results of (Mishrigi and Kubo 1978)
in an experiment where the main objective was to test the effect of territoriality.
According to this author, intraspecific competition modifies fish activity and oxygen consumption, so it can be said that increasing density affects metabolism and
the recommendation would be to keep low densities.
9.7 Biotechnological Approaches on Native Species
with Potential for Production
The efforts and the perception of the environment are different between countries,
but ultimately the problem to be addressed holistically. Studies on fish typically
focus on species that currently have commercial value, causing species that lack
Fig. 9.2 Average dissolved oxygen behavior during a 24 h cycle inside treatments
9 Aquatic Biosystems
283
As can be seen, Fig. 9.3 shows the results from an experiment in which metabolism
were measured. This experiment consists in three different densities and its effect
on tilapia oxygen consumption. It is possible to see that a maximum peak of
consumption was found during the dark period, 02:00 h. Studies on tilapia
metabolism show contrary results compared with results obtained under greenhouse
culture. According to Ross and McKinney (1988), during the light period oxygen
consumption is higher than dark period. However, under hypoxic conditions Tilapia
acquires the oxygen gasping at the water surface, which leads to spend extra energy.
Also this behavior could be supported with the results of (Mishrigi and Kubo 1978)
in an experiment where the main objective was to test the effect of territoriality.
According to this author, intraspecific competition modifies fish activity and oxygen consumption, so it can be said that increasing density affects metabolism and
the recommendation would be to keep low densities.
9.7 Biotechnological Approaches on Native Species
with Potential for Production
The efforts and the perception of the environment are different between countries,
but ultimately the problem to be addressed holistically. Studies on fish typically
focus on species that currently have commercial value, causing species that lack
Fig. 9.2 Average dissolved oxygen behavior during a 24 h cycle inside treatments
9 Aquatic Biosystems
283