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KMID : 0380619930250020185
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Korean Journal of Food Science and Technology
1993 Volume.25 No. 2 p.185 ~ p.190
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Physicochemical Changes in Tilapia Oreochromis niloticus Muscle Induced by Acclimation to Sea Water
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김성준/Kim, Seong Jun
윤호동/박정흠/지청일/황규철/Yoon, Ho Dong/Park, Jeong Heum/Ji, Cheong Il/Hwang, Gyu Chul
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Abstract
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Tilapia cultured in fresh water were acclimated in sea water with daily increase of 5%_0 of salinity and it was completely terminated at the 7th day (0 week). Each three tilapia acclimated were examined weekly based from 0 week to elucidate changes of chloride cells in gill, mineral contents and physical properties in muscle and biochemical characteristics in myofibrils. Chloride cells existed in gills were gradually developed in number and size by acclimation to sea water and became to almost constant state at the third week. Shearing value, compressing strength and content of minerals such as Mg, Na and K in muscle were showed remarkable increase by acclimation to sea water in comparison to those of muscle from tilapia reared in fresh water. Myofibrillar Mg^(2+)-, Ca^(2+)- and K^+(EDTA)-ATPase activities of tilapia acclimated in sea water also increased showing significant statistic difference (p$lt;0.0l) from those of tilapia reared in fresh water. However, thermostability of myofibrils was dropped by acclimation to sea water. The increase of shearing value and compressing strength in the muscle of tilapia by acclimation to sea water would be attributed to the increase of myofibrillar ATPase activities which act to accelerate the decomposition rate of ATP. Therefore, it is suggested that this phenomenon associated with muscle contraction could be brought an improvement of texture of tilapia acclimated in sea water.
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