New microbial technologies applied to the rearing of Eurasian perch Perca fluviatilis in recirculating system

There has been a growing interest in Eurasian perch culture during the
past 10 years. As a potential candidate species for commercially
intensive aquaculture, many constraints are still remaining in the further
development, particularly the lack of knowledge of controlling water
quality in recirculating system and its nutritional requirement, especially,
dietary lipid balance and lipid related problems, such as fatty liver in fish
and steatosis.
In this case, this project was funded in order to solve these basic and
practical problems relating to the aquaculture development.

The overall purposes are:

1. to improve sanitary control of the environment in a
recirculation system by controlling bacterial charge in the
rearing water.
2. to improve the physico-chemical water quality by introducing
detoxifying organisms in rearing water.
3. to improve efficiency of ammonium removal by employing a
biofilter inoculated with some detoxifying organisms.
4. to evaluate the effects of different dietary fat levels on
growth, feed efficiency, biochemical composition and liver
histological changes in Eurasian perch.
5. to determine the effects of various lipid sources on growth,
lipid metabolism (n-3 and n-6 fatty acids elongation and
desaturation) and liver status of perch.
6. to evaluate the effects of dietary factors and culture methods
on biochemical composition, flavour, texture and final flesh
quality of Eurasian perch.