Effects of aflatoxin b1 contaminated feed on thai koi

Abstract

The effects of five levels of aflatoxin B1 (0, 25, 50, 100 and 200 ppb) and three
(15, 30 and 45 days) culture durations on the growth performances and residue
concentration in Thai koi, Anabas testudineus was investigated in indoor plastic
tanks. Significant differences were found in 100 and 200 ppb treatment groups in
average daily weight gain (ADG, g/d) and specific growth rate (SGR, %/d)
compared to those of control, 25 and 50 ppb treatments group. Body muscle in
200 ppb treatment group had significantly higher concentration of aflatoxin B1
(AFB) residue than in the 100 and 50 ppb treatments. Control and 25 ppb
treatments group did not have any residue. Total protein and fat contents
decreased compared to control, 25 and 50 ppb treatments group. The results
suggested that the level of contamination by 50, 100 and 200 ppb aflatoxin B1 in
the feed of Thai koi fingerlings may concentrate in the body muscle at a level of
above human health hazards. Any feeds with even 50 ppb AFB1 should not be
used as feed for raising food fishes.