Effective Use of Bio Resources

As in every ecosystem, same in the marine ecosystem, the connection that each member of these ecosystems has is also shown with the trophic level each one of those has. The fractional trophic level according to Cascuel D. & Pauly D. (2009) is a number that expresses the relative position of an organism in the hierarchy of the food web of every ecosystem and is based on the dietary habits of the same organism and the trophic level of its prey.

The international base for fish, Fish Base (www.fishbase.org) gives information concerning each one of the fish species according to which the Sea Bass (Dicentrarchus labrax) has a 3.79 trophic level and Sea Bream (Sparus aurata) 3.26. Accordingly for the aquaculture Sea Bass and the Sea Bream, taking into consideration the composition of sea feeds, their trophic levels are 2.03 and 1.81 respectively. These numbers are particularly low and it should be noted that they are even lower than the trophic level of the fish intended for fish meals. (Engraulis ringens 2.7) and not for use by humans. So, the aquaculture fish contribute in this way to the upgrading of organisms of the lower trophic level to a higher one and one that is more easily taken by man. This is also proof of the better use of the available renewable bio sources, from aquaculture, for the production of food of high nutritional value food.

The breeding of the Sea Bream and the Sea Bass is done with food whose main ingredients are fish meals and fish oil and also cereals grown in land, such as wheat, corn and soya.
Using material that would never have reached our plates otherwise, such as fresh fish that cannot be used for human consumption (because of their taste or because they have too many bones etc) or other materials such as cereals of low nutritional value (percentage of proteins, carbohydrates, vitamins etc), we produce high nutritional value products like the aquaculture fresh fish.