| Morphological variations, skin colour, physical characteristics and nutritionalcomponents in the muscle, activity of the digestive enzymes in liver, intestinal, stomach,and pancreas, activity of the antioxidant enzymes in liver, renal, and heart, and15bloodbiochemical indices were analysied for Anguilla japonica from three different culturedmodels. Anguilla japonica (snout-vent lengths:25.91±3.26cm) analyzed in this paper weresampled form three different cultured aquaculture models, they were monoculturepopulation (M1), polyculture population (M2) which were kept in the pounds ofMacrobrachium nipponense, and proliferation population (M3) that were collected fromhuge reservoirs.Discriminant analysis, cluster analysis and factor analysis were used for revealing thedifferences of adult individuals of these three cultured aquaculture models. The resultindicated that:(1) The Euclidean distance between M1and M2, M1and M3, M2and M3is1.4328,3.5164, and2.1674, respectively.(3)The accumulative variance percentage of thefirst five principal components was82.1053%, and the eigenvalues of these factors werelarger than1. The three aquaculture models could be clearly separated each other byprincipal components1.(4) In discriminant analysis,5relative parameters were selectedfrom23relative parameters to establish discriminant functions of the aquaculture models.Both discriminant accuracy and synthetic discriminant accuracy were100%.The nutritional components, physical characteristics in the muscle, and the skin colourof Anguilla japonica from three different acquaculture modles were tested and analyzed.The results indicated that:(1) Both M1and M2showed a light yellow and green colour onthe body skin in comparison with M1.(2)The hardness, adhesiveness, springiness,resilience, and chewiness values showed M3≈M2＞M1, M1＞M3＞M2, M3＞M1＞M2, M3＞M1＞M2, and M1≈M3＞M2, respectively.(3) From the tissue slices we can found that thedensity of muscle fiber of M1was much higher than that of M1and M2.(4) The contents ofthe moisture, ash, crude lipid, and crude protein in musule showed M3＜M1＜M2,M3＜M2＜M1, M1≈M2＞M3,and M1≈M3＞M2, respectively.(5) There were no significantdifferences in the contents of C16:0, C24:0, and C18:1among the three series Anguillajaponica, while the contents of the other tested fatty acids including in certain modle ofAnguilla japonica were significantly difference from another one or two model.(6)Thecontents of the common amino acids tested in the study except for Ile, Leu, Lys, Ala, andGly were nearly same among grops. Activity of the antioxidant enzymes in liver, renal, heart, and activity of the digestiveenzymes in liver, intestinal, stomach, and pancreas of Anguilla japonica from threedifferent aquculture models were measured. The results indacated that:(1)There were nosignificant different of the SOD activity in heart and renal among groups, while liver SODactivity showed M1＞M2≈M3. The POD activity in liver and renal showed M1＞M3＞M2and M3＞M1≈M2,respectively. No signicant difference was observed between models forthe activity levels of POD measured in heart, and CAT measured in liver and heart.Fifty blood biochemical indices were measured in this study. The result indacated that:(1) The contents of TP, ALB, GLOB, and the activity of ALT, CHE showed no differencebetween groups.(2) A/G, CREA, ALP, CK, GLU, and BUN showed M1＞M2≈M3, M3＞M1＞M2, M1＜M2≈M3, M1≈M2＜M3, M2＜M1≈M3and M2＞M1≈M3, respectively. Both ASTand LDH showed M1≈M2＞M3. |
