Whole Pangasius. Seventy ve specimens of gutted
whole Pangasius (750–850 g weight) were obtained from two
large UK sh processors. Originally the sh were reared in two
main aquaculture areas of the Vietnamese Mekong Delta. One
group of 40 farmed sh were obtained in October 2011 from Tan
Thanh farms located north of Cao Lanh in the Mekong Delta. In
July 2012, 35 whole sh that had been farmed either north of
Long Xuyen or in Cao Lanh were obtained through Agish. The
two Vietnamese companies use different sh feeds. October to
December is in the wet season, and February to May is the dry
season in Vietnam. Fish were collected from both seasons in
case there were differences in the growth of the sh. The sh
were transported frozen and stored at 18 C at the Young's
Seafood site in Grimsby. The whole sh were thawed slowly over
a 2 day period, to 2 C in order to minimise any drip loss,
which was in fact unnoticeable. The fish were filleted whilst still
stiff, and the fillet trimmed. The two fillets obtained from one
sh were homogenised and a 250 g sample transferred to a
sample pot.