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Pakistan Journal of Biological Sciences

Year: 2001 | Volume: 4 | Issue: 9 | Page No.: 1144-1148
DOI: 10.3923/pjbs.2001.1144.1148
Studies on the Post-mortem Changes in Genetically Improved Farmed Tilapia (Oreochromis niloticus) During Ice Storage
L. Yasmin, Kamal M., S.A. K. Ahmed, K. M. Azimuddin, M.N. A. Khan and M. N. Islam

Abstract: Studies were conducted on the post-mortem changes in genetically improved farmed tilapia (Oreochromis niloticus) during ice storage. Fish sample kept at room temperature, rigor started 1 hr. after spiking, reached full rigor (100%) within 3 hr which continued for 3 hr. . In ice stored fish, rigor started within one hour and attained full rigor (100%) within 2 hr that continued for 16 hrs. The pH of the muscle was about 7 immediately after catch and started to decrease gradually with the lapse of storage period. But the decrement of pH in samples stored at room temperature was much rapid than those stored in ice. Organoleptically the fish were in acceptable conditions for 16 days. The initial TVB-N and peroxide values were 5.3 mg/100g of fish and 5 meq/kg of fish respectively. These values gradually increased with the lapse of storage time but remained within the recommended limit up to 16 days. Ca2+ ATPase activities in presence of 0.1M KCl and 0.5 M KCl were 0.349 and 0.139 μmol.pi/min. mg, respectively, and decreased gradually with storage period. Mg2+ ATPase activities in presence and absence of Ca2+ were 0.418 and 0.183 μmol.pi/min. mg respectively. The myofibrillar solubility decreased gradually from around 85.33% to 38.6% at the end of the 16 days of ice storage. The bacterial loads in muscle of ice stored GIFT varied from 7.6 × 103 to 7.1 × 103 cfu/g at 2nd day of storage and then gradually increased with storage period. At the end of the 16 days of ice storage, bacterial load increased to 4.6 × 106 cfu/g and at this stage the fish were organoleptically in acceptable condition. After 18 days of storage the bacterial load was 3.8 × 108 cfu/g that exceeded the acceptable recommended limit.

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How to cite this article
L. Yasmin, Kamal M., S.A. K. Ahmed, K. M. Azimuddin, M.N. A. Khan and M. N. Islam, 2001. Studies on the Post-mortem Changes in Genetically Improved Farmed Tilapia (Oreochromis niloticus) During Ice Storage. Pakistan Journal of Biological Sciences, 4: 1144-1148.

Keywords: Gift, rigor-mortis, storage and quality

REFERENCES
  • Bandyopadhyan, J.K., A.K. Chattopadhyan and S.K. Bhattacharyya, 1986. Studies on the ice storage characteristics of Catla catla and Labeo fimbriatus. Fish. Tehnol. Soc., 23: 140-142.

  • Bito, M., K. Yamada, Y. Mikumo and K. Amono, 1983. Studies on rigor-mortis of fish-1. Differences in the mode of rigor-mortis among some varieties of fish by modified cuttings method. Bull. Tokai Reg. Fish. Res. Lab., 109: 89-96.

  • Connel, J.J., 1980. Quality Deterioration and Extrinsic Quality Defects in Raw Material. In: Control of Fish Quality, Connell, J.J. (Ed.). 2nd Edn., Fishing News Books Ltd., Surrey, England, pp: 31-35

  • Faruk, M.A.R., 1995. Studies on the post-mortem changes in Rohu fish (Labeo rohita). M.Sc. Thesis, Department of Fisheries Management. Bangladesh Agricultural University, Mymensingh, Bangladesh.

  • Gornall, A.G., C.J. Bardawill and M.M. David, 1949. Determination of serum proteins by means of the biuret reaction. J. Biol. Chem., 177: 751-766.
    CrossRef    PubMed    Direct Link    

  • Howgate, P., A. Johnston and K.J. Whittle, 1992. Multilingual guide to EC Freshness Grades for Fishery Products. Torry Research Station, Food Safety Directorate, Ministry of Agriculture, Fisheries and Food, Aberdeen, Scotland.

  • Iwamoto, M. and H. Yamanaka, 1986. Remarkable difference in rigor-mortis between wild and cultured specimens of the red sea bream. Nippon Suisan Gakkaishi, 52: 125-279.

  • Iwamoto, M., H. Yamanaka, H. Abe, H. Ushio, S. Watanabe and K. Hashimoto, 1988. ATP and creatine phosphate breakdown in spiked plaice muscle during storage. J. Food Sci., 53: 1662-1665.

  • Kamal, M., S. Gheyasuddin, S.C. Chakraborty, M.A. Hossain, M.A.R. Faruk and M.I. Hossain, 1994. Development for handling, transportation and processing of high quality hilsa fish. Studies on organoleptic characteristics on the quality changes in hilsa during ice storage. BAU Res. Progr. No. 8.

  • Lima-dos-Santos, C.A.M., 1981. The storage of tropical fish in ice: A review. Trop. Sci., 23: 97-127.

  • Penny, I.F., 1967. The influence of pH and temperature on the properties of myosin. Biochem. J., 104: 609-615.
    PubMed    Direct Link    

  • Perry, S.V. and T.C. Grey, 1956. A Study on the effect of substrate concentration and certain relaxing factors on the magnesium activated myofibrillar adenosine triphosphate. Biochem. J., 64: 184-192.

  • Poulter, F.G., C.A. Curran and J.G. Disney, 1981. Chill storage of Tropical and Temperate Water Fish-Differences and Similarities. Advances in Technology in the Chilling, Freezing, Processing, Storage and Transport of Fish, Especially Underutilized Species. Intl. Inst. Refrigeration, Paris, pp: 111-123.

  • Seki, N., Y. Oogane and T. Watanabe, 1980. Changes in ATPase activities and other properties of sardine myofibrillar proteins during. Nippon Suisan Gakkaishi, 46: 697-715.

  • Seki, N., M. Ikeda and N. Narita, 1979. Changes in ATPase activities of myofibrillar proteins during ice storage. Nippon Suisan Gahhaishi, 45: 791-799.

  • Bandyopadhyan, J.K., A.K. Chattopadhyan and S.K. Bhattacharyya, 1985. Studies on the Ice Storage Characteristics of Commercially Important Freshwater Fishes. In: Harvest ad Postharvest Technology of Fish, Ravindran, K., N.U. Nair, P.A. Perigreen, P. Madhavan, A.G.G. Pillai, P.A. Panicker and M. Thomas (Eds.). Society of Fisheries Technologists, Cochin, India, pp: 381-385

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