Preface ixVH13-1. These colonies were proved to become lysogenic infection of VH-P.
The study shows that using temperate phage of VH-P to treat VH bacterium, it
is necessary to treat with the sufficient amount of the VH-P phage at once.
Insufficient amount of MOI will allow the VH to develop lysogenic infection
and cause interference to super-infection of the same phage. Accordingly, the
strategies to develop phage therapy as an alternative to using antibiotic
treatment of bacterial contamination and infection will be discussed.
Chapter 3 - Farming of fish with Recirculating Aquaculture Systems
(RAS) is becoming widespread due to diminishing wild-caught supplies.
However, the accumulation of ‘earthy’ or ‘muddy’ off-flavours due to taint
chemical as geosmin (GSM) or 2-methylisoborneol (MIB) in the fish-flesh of
farmed species is a major concern. Inconsistent quality of farmed-fish has been
identified as a major issue in buyer resistance. Predictive mathematical
models, widely used in bio-chemical engineering, provide a basis for
evaluating environmental toxicology and risk assessments in RAS farmed fish.
The use of models to predict taste-taint chemicals in fish-flesh with growth is a
new concept and can be used to help farmers and researchers in decision
making and farm protocols. In this chapter the authors discuss taste-taint
modelling in RAS farmed fish including: taste-taint problems in RAS farmed-
fish; an overview of predictive models for chemical congeners in fish-flesh;
models for predicting accumulation of GSM and MIB in fish-flesh;
development and limitations of predictive models; factors to be considered in
developing an adequate model for RAS fish, benefits of models to the supply
chain, and; a critical review of an extensive recent experimental validation of
one predictive model and risk analyses.
Chapter 4 – The authors investigated the causative effect of protein, lipid,
feeding level and their interaction on growth, biological parameters and
haematology of Oreochromis niloticus. Thus, O. niloticus (15.63 ± 0.40g
mean weight ± SD) were reared at two different levels of protein (25% and
35%), two levels of lipid (8% and 12%) and three levels of feeding (100%,
70% and 50%) for 8 weeks. Higher weight gain % (WG%), feeding efficiency
(FE) and specific growth rate (SGR) was observed in H35 suggesting that the
main component in diet which influences growth is protein. Feed intake was
inversely related to the dietary lipid level suggesting that high lipid levels
could affect appetite of fish. There was no significant interactive effect of
protein and lipid on WG (%), SGR, and feed intake (FI) indicative that O.
niloticus can efficiently utilize carbohydrate better than lipid. High lipid level
enhanced high viscerasomatic index (VSI) and intraperitoneal fat (IPF)
indicating that fish fed with high lipid diets were unable to utilize the entire