The Effects Of Dietary Poisonous Or Deleterious Substances On Growth And Its Residues In Tissues Of Japanese Seabass, Lateolabrax Japonicus And Large Yellow Croaker, Poseudosciaena Crocea

Feeding experiments were conducted to investigate the effects of dietary squid visceral ointment (SVO) on the growth and cadmium residues in tissues of Japanese seabass, Lateolabrax japonicus and large yellow croaker, Poseudosciaena crocea. Studies were also conducted to determine the effects of dietary olaquindox on the growth and its residues in tissues of two fish. Results of the present study are presented as follows:1.No significant differences were observed in survival of Japanese seabass among dietary treatments. However, the growth of Japanese seabass was significantly improved by dietary squid visceral ointment (SVO). Fish fed diets with 5% and 10% SVO supplementation had significantly higher specific growth rate (SGR) (3.5 % day"1 for 5% and 3.7 % day"'for 10% supplementations ) than the control group ( no SVO in dietary)(3.2 % day"1) (PO.05), but no significant differences were found between two SVO levels.2.The cadmium concentrations in tissues (muscle, liver, kidney and gill) of Japanese seabass were significantly influenced by the dietary squid visceral ointment (SVO). The cadmium concentrations in different tissues of fish were different and increased with increasing dietary SVO levels (PO.05). The cadmium concentrations in different organs had a similar decreasing order as kidney, followed by liver and gill in each treatment. The cadmium concentrations in muscle, however, were undetectable in the present study.3.The survival of large yellow croaker ranged from 89.3% to 91.7%, and no significant differences were observed among dietary treatments. Fish fed diets with 5% and 10% SVO supplementation had significantly higher specific growth rate (SGR) (1.71 % day"1 for 5 % and 1.77% day"1 for 10% supplementations ) than the control group(1.51 % day"1) (PO.OS), but no significant differences werefound between two SVO levels.4. The cadmium concentrations in tissues (muscle, liver, kidney and gill) of large yellow croaker were significantly influenced by the dietary squid visceral ointment (SVO). The cadmium concentrations increased with increasing dietary SVO levels (/)<0.05) and varied in different tissues of fish, which showed a similar decreasing order as kidney, followed by liver and gill in each treatment. The cadmium concentrations in muscle, however, were undetectable in the present study.5. The survival and growth of Japanese seabass were significantly influenced by the dietary olaquindox (P<0.05). The survival of fish fed the diet with 300 mg kg"1 oalquindox was significantly lower than the control group and other two supplementation groups (50 and 100 mg kg"1). The growth of the fish fed the diets with 50 and 100 mg kg"1 olaquindox were significantly higher than that offish fed with control diet and the 300 mg kg"1 supplementation diet.6. No olaquindox and 3-methyl-quinosaline-2-carboxylic acid (MQCA) were detected in tissues of fish fed with control diet. The olaquindox and MQCA concentrations in liver, skin were increased with increasing dietary olaquindox and significantly influenced by dietary olaquindox levels. The concentrations in each tissue of fish fed with dietary olaquindox were higher than the maximum residue limits of Chinese Agriculture Ministry. However, there was no detected olaquindox in fish muscle of each treatment.7. The survival and growth of large yellow croaker were significantly influenced by the dietary olaquindox (PO.05). The survival offish fed with 50 and 100 mg kg"1 olaquindox diets were significantly higher than the control group (no olaquindox) and 300 mg kg"1 olaquindox diet. However, the survival of fish fed with high level of dietary olaquindox (300 mg kg"1) (86.00%) was significantly lower than the control group (89.33%). The growth of the fish fed diets with 50, 100 mg kg"1 and 300 mg kg"1 olaquindox were significantly higher than that of fish fed with control diet. However, there were no significant differences among the three supplementation treatments.8. No olaquindox and 3-methyl-quinosaline-2-carboxylic acid...