Su Ürünleri Dergisi

Öz

It is known that most of the Seabass (Dicentrarchus labrax, L., 1758) and Seabream (Sparus aurata, L., 1758) that are freshly consumed in Turkey are obtained from the netcages in Ege region and from hatchery systems. In this study, with this fact tken into consideration, physical and chemical quality controls such as pH value, total volatile base nitrogen (TVB-N) mgN/100g, thiobarbyturic acid count (TBA) mg malonadehyde/kg, free Formaldehyde (FAex) and free and linked Formaldehyde (FAdest) mg/kg researched of the Seabream and Seabass under consumption conditions that are sold in fish markets at Izmir region. The established values of Seabream that were frozen in straphor boxes at the net cage foundation of Mugla district before being carried to Izmir and displayed for sale behind a glass window in frozen conditions are as follows : on the first day; the pH value 6.35±0.01, TVB-N value 23.56±1.63 mgN/100g, TBA count 1.79±1.39 mg malonaldehyde/kg, FA(ex) 1.66±0.09 mg/kg, FA(dest) 0.81±0.42 mg/kg. At the and of the seventh day, the values are 6.55±0.01, 18.2±0.88 mgN/100g; 1.94±0.51 mg malonaldehyde/kg, 1.91±0.32 mg/kg, 1.25±0.28 mg/kg respectively (test material A). The established values of seabass that were obtained from hatchery foundations in Izmir (Cesme)
district and were stored in the same conditions as the house refrigerator are as follows : (test material B1) On the first day pH, TVB-N, FA(ex), FA(dest) respectively; 6.45±0.03, 17.5±0.76 mgN/100g, 0.35±0.14 mg malonaldehyde/kg, 2.33±0.47 mg/kg, 0.59±0.21 mg/kg. At the and of the seventh day the values are respectively; 6.59±0.02, 20.6±2.17 mgN/100g, 0.19±0.11 mg malonaldehyde/kg, 1.72±0.62 mg/kg, 1.87±1.19 mg/kg. The values for Seabream that were stored under the same conditions are (test material B2) respectively; on the first day, 6.37±0.03, 16.56±1.05 mg/100g, 0.40±0.09 mg malonaldehyde/kg, 2.43±1.31 mg/kg, 0.90±0.27 mg/kg. At the end of the seventh day, the values are respectively; 6.67±0.12, 26.07±0.67 mgN/100g, 0.73±0.84 mg malonaldehyde/kg, 2.08±0.46 mg/kg, 1.03±0.35 mg/kg. The established values for seabream that were obtained from hatchery foundations in Izmir (Cesme) district and were sold at fish markets in Izmir are as follows: (test material C) On the first day, pH TVB-N, TBA, Fa(ex) and FA(dest) values are respectively; 6.45±0.10, 17.15±0.70 mgN/100g, 0.36±0.10 mg malonaldehyde/kg, 2.14±0.17 mg/kg, 2.34±0.18 mg/kg. At the second day the values are respectively; 6.44±0.05, 15.4±1.14 mgN/100g, 0.51±0.28 mg malonaldehyde/kg, 1.07±0.07 mg/kg, 1.07±0.09 mg/kg The established values for Seabass that were obtained from net cage foundation of Mugla district and were displayed for sale behind a glass window in frozen conditions are as follows :( test material D) At the end of the third day pH, TVB-N, TBA, FA(ex) and FA(dest) values are respectively; 6.58±0.02, 18.20±0.88 mgN/100g, 0.37±0.16 mg malonaldehyde/kg, 2.48±0.37 mg/kg, 1.06±0.36 mg/kg. At the end of the days of storage, in control groups, a higher amount of rise in the pH values and TVB-N values that show the microbic formations, then the other analysed criteria was observed. The recorded oil amounts in control fish were respectively; (test material A, B1, B2, C, D) 7.16±1.83%. 4.92±1.38%, 6.82±1.42%, 8.00±0.68, 4.62±70%. The species are all rich in fat amounts. It is recorded that all fish maintain their good or excellent conditions in a maximum of 7 days storage under all consumption conditions.