engleski

Quantities of total volatile bases nitrogen (TVB-N) and trimethylamine nitrogen (TMA-N) in sardines and herrings utilized as food for tuna fattening

Farming of bluefin tuna (Thunnus thynnus) in Mediterranean countries as well as in Croatia has increased during the last ten years. For the feeding of tuna in farming production, small blue fish, sardine (Sardina pilchardus) and herring (Clupea harengus) are used. These two species of food are imported from Northern Europe, and are landed to farming companies in frozen condition until usage. The quality of farmed tuna fish depends on quality and freshness in the fish flesh because feeding with low quality fish can cause a serious health problems:fall of the health defending system, the infection with parasites and stress which results with decrease of growth within the farming population and mortality. Because the lack of publications on the theme of freshness levels and health problems the quantities of total volatile bases nitrogen (TVB-N) and trimethylamine nitrogen (TMA-N) in sardines and herrings after one year of frozen storage were studied. Analyses were done depending on sardine and herring body mass. The study detected no relation between quantities of TVB-N and spoilage level, it indicates that TVB-N quantities for both species after one year of storage are within the limit of acceptability (25-35mg/100g). The quantities of TMA-N are greater than those registered as the limit of acceptability (10-15 mg/100g) for these species. Functional relations between TVB-N and TMA-N is not linear. These results makes the freshness of the analysed fish for the tuna fattening unsuitable

total volatilebases nitrogen; trimethylamine nitrogen; tunna fattening; sardine; herring

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