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Journal of Fisheries International
Year: 2006  |  Volume: 1  |  Issue: 2  |  Page No.: 136 - 140

Implication of Organ and Tissue Weight to the Processing of Some Selected Fresh Water Fish Families

O.A. Oyelese    

Abstract: The implications of organ weight to body (tissue) weight to the consumers preservations and processors was studied using the following representative members of five selected fresh water fish families. They are family. Clariidae example used is Clarias gariepinus, Mochokidae example used is Synodontis clarias, Cichlidae example used is Tilapia niloticus, Bagridae example used is Chrysicthys nigrodigitatus, Channidae example used is Channa obscure, Four replicates (including 2 females and 2 males of fish were used in each case) were dissected after taking their initial total body weights. Each internal organ (the gonad, liver, heart, gall bladder, spleen, kidney and gut) were weighed using a sensitive accoulab weighing scale. The percentage organ weight of the total body weight was calculated for each representative member of the five families. Also the total organ weight was deducted from the total body weight to five the actual fleshy edible tissue weight for each family. From this the productive potential fish yield factor (PPFYF) was calculated. The productive potential fish yield factor was not significantly (p>0.05) different among the 5 fish families with the highest value of 0.9695 recorded for Chrysichthys (Bagndae), second is Tilapia (Chichlidae) with 0.9692, this is followed by Channa (channidae) 0.9639 fourth is Synodontis (Mochokidae) 0.9543, while the least PPFYF of 0.9422 was recorded in Clarias (Clariidae). The least total organ weight of 3.05% was recorded in Chrysichthys, while the highest total organ weight of 5.78% was recorded in Clarias also with the second highest values of 4.57% recorded in Synodontis. The lowest PPFYF (0.9422) recorded for Clarias gariepinus is as a result of the gonad weight (1.95%) and heart weight (0.11%) while the PPFYF value (0.9543) recorded for Synodontis clarias was as a result of the liver weight (1.09%), kidney weight (0.67%) and gut weight (2.33%) of total body weight. This implied total overall body weight does not determine fish yield (PPFYF) as in this study Clarias gariepinus had the highest total mean weight of 402.50 gm but the highest total organ weight of 23.28 gm (i.e., 5.78% of total body weight). Also a high proximate Crude Protein (C.P) composition of a fish does not necessarily imply a proportional or corresponding laying of fish flesh as shown in this study with Clarias gariepinus having the highest crude protein of 62.00% followed by Syodontis clarias with 53.38%.

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