HASAN, A., GOMAAH, S. (2006). COMPARTIVE STUDY FOR CARCASS TRAITS AND CHEMICAL COMPOSITION ON SOME FRESHWATER FISH GROWN UNDER EGYPTIAN CONDITIONS. Egyptian Journal of Agricultural Research, 84(1), 191-202. doi: 10.21608/ejar.2006.230012
AMAL S. HASAN; SAFWAT A. A. GOMAAH. "COMPARTIVE STUDY FOR CARCASS TRAITS AND CHEMICAL COMPOSITION ON SOME FRESHWATER FISH GROWN UNDER EGYPTIAN CONDITIONS". Egyptian Journal of Agricultural Research, 84, 1, 2006, 191-202. doi: 10.21608/ejar.2006.230012
HASAN, A., GOMAAH, S. (2006). 'COMPARTIVE STUDY FOR CARCASS TRAITS AND CHEMICAL COMPOSITION ON SOME FRESHWATER FISH GROWN UNDER EGYPTIAN CONDITIONS', Egyptian Journal of Agricultural Research, 84(1), pp. 191-202. doi: 10.21608/ejar.2006.230012
HASAN, A., GOMAAH, S. COMPARTIVE STUDY FOR CARCASS TRAITS AND CHEMICAL COMPOSITION ON SOME FRESHWATER FISH GROWN UNDER EGYPTIAN CONDITIONS. Egyptian Journal of Agricultural Research, 2006; 84(1): 191-202. doi: 10.21608/ejar.2006.230012
COMPARTIVE STUDY FOR CARCASS TRAITS AND CHEMICAL COMPOSITION ON SOME FRESHWATER FISH GROWN UNDER EGYPTIAN CONDITIONS
Central Lab. For Aquaailture Research (CLAR), Arcultural Research Center, Ministry of Agriculture, Dokki, Giza, Egypt
Abstract
Dressing traits and chemical body composition comparisons for four fish specie (12 fishes for each) were determined, namely Mania (Oreachromts anus), Bayad (Bagrus Payach, common carp (Cyptinus carpio) and African catfish (arias gatienus) during the summer months of year 2009. Samples of studied fish species were sorted and divided into 4 size grades (3 fish for each) using stratified random sampling technique. After collecting, fish were frozen until analysis. After thawing, the parts of fish were separated according to their anatomy. These parts were divided into edible and in-edible parts, where the in edible parts are 1-head, 2-backbone, 3-viscera, 4-Ms, and 5-scales while, the edible parts are 1-meat yield (muscles and gonads) and 2-fillet. Tow samples of fillet were taken from each species for measuring the body chemical composition. The results obtained can be summarized as follows: (1) The size grade had no significant effect (Pc0.05) on the condition factor for all tested species (except African catfish). Contrary, the species had a significant effect (P<0.05) on condition factor, where the Tilapia had the highest significant values (1.93-2.41), but, common carp had the least values10.54-0.59) when compared to other tested species. (2) The fish size grade (except for Bayed) species was affected Significantly (P<0.05) on dress-out %. The results demonstrated that the lower significant values (P<0.05) of dress-out % were reported for Tilapia (79.85-83.92%). Also, the higher values (P<0.05) were for African catfish (84.65-89.55%) when compared to the other species. (3) In general, the edible parts weight % (muscles and gonads weight %), fillet yield % and the in-edible Parts % showed similar trend, where, they were affected significantly (P<0.05), by the species, but not by the size grade. (4) There was a general tendency towards increasing the fins weight % as the fish size increased within each species (Tilapia, Bayed and common Carp), while, the African catfish fins % decreased as the fish size increased. (5) MI chemical body composition parameters were affected significantly (P<0.05) by species. Small variations were observed for both moisture % ( 71.75-76.00%) and protein % (16.95.19.45%) as affected by species. Titania showed highly significant value (P<0.05) of protein % (19..45%), but a lower significant (P<0.05) value of lipids % (1.65%) was calculated on fresh weight.
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