Fish is a nutrient rich food and possesses many components that have positive impact on human health. Nowadays, the fish come to the market from wild-capture fisheries and aquaculture. Latter becomes increasingly global for human consumption, thus total finfish aquaculture includes over 300 species farmed in ponds, floating net cages and recirculating aquaculture systems (RAS). It is reasonable to assume that the chemical composition of farmed fish will vary compared to wild-caught ones due to the different rearing conditions and artificial diets used for feeding the fish. This study gives an overview of basic chemical composition of pikeperch (Sander lucioperca) and rainbow trout (Oncorhynchus mykiss). We analysed the muscle flesh composition of fresh and frozen pikeperch obtained from the local commercial tank-based recirculating aquaculture system together with rainbow trout obtained from river-based net cage farming system. We determined that fresh pikeperch contained 78.27±0.34% moisture, 18.95±2.45% protein, 1.34±0.18% fat and 1.62±0.21% ash, while frozen ones had 78.26±0.44, 20.91±0.62, 0.77±0.15 and 0.99±0.09% respectively. Statistically significant differences were found for fat and ash content (p<0.05). In both cases, artificially cultivated pikeperch has high nutritional value and fit for human consumption. The chemical composition of trout was the following: 69.61±1.33% moisture, 17.78±0.48% protein, 11.41±2.24% fat and 0.88±0.01% ash. After reviewing the literature, we found that farmed trout has considerably higher fat content than wild trout. This primarily can be explained by use of lipid-rich diets and lower mobility in cages.
In 2007, the European Commission initiated the Eel Recovery Plan (Council Regulation No. 1100/2007) to try to bring the European eel stocks back to more sustainable adult levels and the return of the glass eel. Each EU Member State is required to develop a national eel management plan. These plans aim to achieve a return of silver eels to the spawning population equal to or greater than 40% of the potential biomass that could be obtained in the absence of anthropogenic disturbances related to fishing, water quality or barriers to migration. The advantage of this approach is that it offers a standard basis and allows for the integration of stock status data between EU and non-EU countries.
The purpose of this Plan was to determine for the Vistula Lagoon within the territory of the Kaliningrad region of the Russian Federation:
1. Management objectives based on an assessment of the potential stock of the silver eel in the absence of anthropogenic mortality and high (before 1980) recruitment levels.
2. The current level of the stock of silver eel in relation to the planned indicator (ie assessment of compliance with the planned indicator).
3. Control actions necessary to achieve or maintain this compliance.
4. A set of data needed to support the steps 1-3 above and to demonstrate whether compliance will be achieved in the future, i.e. that the actions defined in the management plan will lead to the recovery of the eel population.
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