Mekong giant catfish, Chao Phraya catfish and their hybrid: morphology, carcass composition and dress-out percentages
1996
Krit Mongkonpunya | Chokechai Senawong | Thusanee Pupipat | Tiersch, Terrence (Kasetsart Univ., Bangkok (Thailand). Faculty of Science. Dept. of General Science)
Morphological comparisons, meristic counts and measurements of the parental species (Pangasius gigas and P. hypopthalmus) and the hybrid were presented. Gut contents, the gastrointestinal tract (GIT), growth and carcass compositions were also studied. The live weight of the 2.5-year-old farm-raised fishes were significantly different among parental species and hybrid, with P. gigas (8 kg) being the largest, the hybrid (3.5 kg) intermediate and P. hypopthalmus (2 kg) the smallest. P. gigas had the he combined weights of the fillets and belly flap roughly the same in percentage (52-53 percent) as those of the hybrid (49 percent), but higher than that of P. hypopthalmus (47 percent). There was no significant difference among the fillets of subadults in the percentages of protein and moisture. The fat content of fillets was significantly higher in P. gigas (3 percent) than in the hybrid (0.6 percent) and P. hypopthalmus (0.3 percent). Since there were no stomach contents in the wild adult of P. gigas examined within 3 h after capture and the subadult P. gigas had remarkedly high fillet fat content, these suggests that wild adult of P. gigas could accumulate a large amount of energy reserves and perhaps do not feed regularly prior to the spawning migration.
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