การแยกปลาดุกอุย (Clarias macrocephalus Gunther, 1864) จากแหล่งธรรมชาติและจากฟาร์มเลี้ยงโดยใช้ข้อมูลทางโภชนาการ

Abstract

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 morphometrics (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. The thermal transition characteristics of sarcoplasmic proteins, as well as myosin denaturation enthalpy, fatty acid profiles (C18: 2n6, C20: 0, C22: 1n9, C24: 0, Epolyunsaturated fatty acids, and En-6) and mineral compositions (Cu and Pb) 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 that can be used to identify the origin of fish for forensic purposes, of for conservation biology of this near threatened species. The new nutritional information may be of interest to marketing and consumers.