Abstract
The quality of Nile tilapia (Oreochromis niloticus) produced in Algeria was assessed after refrigerated (4°C) storage as well as ambient temperature (30°C) keeping, corresponding to usual fish selling conditions in Algeria. Sensorial, microbial and biochemical analyzes were conducted in parallel. Moreover, the nutritional quality of fresh tilapia was also assessed by determining the proximate composition and the fatty acids profile. Results of lipid oxidation, namely hydroperoxydes and thiobarbituric acid-reactive substances (TBARS), proteolysis, represented by total volatile basic nitrogen (TVB-N) and trimethylamine (TMA-N), sensory assessment and bacterial load were highly correlated. They demonstrated that the shelf life of tilapia is limited to 12 h and five days of storage at 30 and 4°C respectively. After these period of time, fish was rejected by sensorial analysis and all the parameters thresholds (fixed in the present study at 0.85 mg MDA kg-1 of wet weight for TBARS, 35 mg TVB-N 100 g-1 of flesh, 8 mg TMA-N 100 g-1 of flesh and 6 log cfu g-1 for total viable count) were exceeded. Key words: Shelf life, Oreochromis niloticus, fatty acid profile, thiobarbituric acid-reactive substances (TBARS), trimethylamine (TMA), hydroperoxides.
Highlights
In Algeria, aquaculture has clearly evolved and become a priority of the government to offset the deficit of fishery products
The results of fatty acid profiles of Algerian farmed tilapia and tilapias fishes provided by the Research and Education Center in Aquaculture (CEFRA)
The results show that the lipid fatty acid composition varied between the different sources of tilapia
Summary
In Algeria, aquaculture has clearly evolved and become a priority of the government to offset the deficit of fishery products. New continental freshwater species such as Nile tilapia (Oreochromis niloticus) were introduced. The intensive farming of tilapia, Oreochromis sp. Is rapidly expanding and tilapias are the second most widely farmed fish in the world with annual production exceeding 3 million tons in 2010 (FAO, 2012). Tilapias have many attributes that make them an ideal candidate for promo-ting aquaculture and provide sustainable development in Algeria. These include: fast growth, tolerance to a wide range of environmental conditions, resistance to stress and disease, ability to reproduce in captivity, feeding on low trophic levels and good sensorial proprieties of flesh (Boari et al, 2008). Freshwater fish represent an important source of high-
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