Identification of wild and farmed broadhead catfish (Clarias macrocephalus Günther, 1864) based on morphometry, digestive indexes and flesh quality

摘要

Wild and farmed fish generally differ in their nutritional composition.In this study,adult wild and farmed broadhead catfish (Clarias macrocephalus Günther,1864) were collected and were assessed for various characteristics,namely morphometrics,digestive indexes,and flesh quality.The morphometries (standard length,body depth,eye width,fin height and tentacle length) and the digestive indexes (intestosomatic index,digestosomatic index,perivisceral fat index and activities of pepsin and lipase) differed significantly between the groups (P＜0.05) and can be used to distinguish wild fish from farmed fish.In terms of protein synthesis capacity and color,the flesh quality was similar between the groups.However,radical scavenging activities and reducing power were significantly higher in the wild fish than in the farmraised group.The thermal transition characteristics of sarcoplasmic proteins,as well as myosin denaturation enthalpy and fatty acid profiles (C18:2n6,C20:0,C22:In9,C24:0,∑polyunsaturated fatty acids,and ∑n6) also exhibited potential to enable calls about the fish origin.The proximate chemical composition of whole body did not differ between the two fish populations.Our findings suggest bioindicators,in terms of morphometrics,digestive indexes and flesh quality,that can be used to identify the origin offish for forensic purposes,of for conservation biology of this near threatened species.The new nutritional information may be of interest to marketing,consumers,and has a connection to nutritional effects on human health.